Article
Engineering, Multidisciplinary
Liu CaiMing, Oluwadamilola Ogunmola, Li BingBing, Zheng Yiming, Chen Xu
Summary: This study investigated the influence of thermal aging on the ratcheting boundary of 316LN austenitic stainless steel, finding that the boundary slightly increases with thermal aging time, especially with a larger secondary ratio. RCC-MR standard was found to be more conservative compared to ASME, and it is suggested to choose the stage when the efficiency index V stabilizes for a more conservative and reasonable approach.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Nanoscience & Nanotechnology
Wen-Hao Yang, Peng-Ming Cheng, Yang Li, Ruihong Wang, Gang Liu, Lu Xin, Jin-Yu Zhang, Dan-Ping Li, Hai-Bing Zhang, Jun Sun
Summary: Tensile tests and ratcheting tests were conducted on a 316LN austenitic stainless steel at various temperatures to investigate the influence of dynamic strain aging (DSA) on deformation behavior and microstructural evolution. The results showed that the DSA temperature range was above 400°C. A sudden drop in ratcheting strain accumulation was observed when the temperature increased from 300°C to 400°C. Within the DSA temperature region, the ratcheting behavior was found to be insensitive to temperature. Microstructural examinations revealed different structures in samples with and without DSA, indicating a change in the predominant ratcheting deformation mechanism. The balance between DSA-induced hardening and thermally-activated softening led to temperature-insensitive ratcheting behavior within the temperature range of 400°C to 600°C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Bingbing Li, Yiming Zheng, Gang Chen, Takamoto Itoh, Xu Chen
Summary: The effects of strain amplitude on the isothermal fatigue and thermomechanical fatigue behaviors of 316LN stainless steel were studied and the physical mechanisms for the evolution of cyclic stress response were revealed. The manifestations of dynamic strain aging, dependence on loading modes and influence on deformation properties were discussed. A change in the dominated damage mechanism occurred at a strain amplitude of approximately 0.27%, where the isothermal fatigue and thermomechanical fatigue life curves intersected. The maximum stress was found to be an appropriate damage parameter for life prediction with a scatter band of 1.5.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Zhiheng Xiong, Yunxin Wang, Bin Yang, Yanli Wang
Summary: This study investigates the effects of orthogonal scratches on the stress corrosion cracking (SCC) sensitivity of 316LN stainless steel. The experimental results show that at the intersection of orthogonal scratches, larger strain concentration and more oxide particles are formed, resulting in greater SCC sensitivity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Chang Hong, Tao Chen, Zhenhua Li, Aobo Du, Meng Liu, Pan Liu, Yonghao Lu
Summary: This study investigates the ratcheting deformation behavior of 316LN stainless steel under different mean stresses. Experimental results and molecular dynamics simulation reveal the three-stage evolution of ratcheting deformation and its dependence on dislocation evolution. The findings provide insights into the microstructure evolution mechanism of ratcheting deformation at atomic scale.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Takeru Sakurai, Osamu Umezawa
Summary: The plane strain fracture toughness of type 316LN nitrogen-strengthened austenitic stainless steels at 4.2 K depends on their stability, characterized by the Md30 index. Deformation microstructures and martensite at the crack tip were evaluated for the LF and HF types. The plastic strains and volume of alpha'-martensite were higher in the HF type, while LF type showed dominant planar slip bands with martensite. The formation of alpha'-martensite at the crack tip was influenced by low plastic strains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Bingbing Li, Jingyu Yang, Zongchi Wang, Gang Chen, Xu Chen
Summary: Continuous and interrupted LCF tests were performed to investigate the impact of temperature, strain rate, and strain amplitude on the LCF behavior of nitrogen-alloyed 316LN stainless steel. The cyclic hardening and softening behavior at different strain amplitudes were analyzed using stress decomposition method and characterization of dislocation configuration evolution. Furthermore, the primary damage mechanism leading to various cracking modes under different loading conditions was determined based on the examination of fracture surface and secondary cracks on the longitudinal section.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Nanoscience & Nanotechnology
Wen-hao Yang, Peng-ming Cheng, Yang Li, Ruihong Wang, Gang Liu, Lu Xin, Jin-yu Zhang, Jun Sun
Summary: This paper systematically investigated the microstructural evolutions, especially the twinning/de-twinning behaviors, in a 316LN austenitic steel under ratcheting cycling. The experimental results showed a potential correlation between the twinning/de-twinning and the dislocation pattern, with the peak stress playing a critical role in triggering deformation twins. The findings suggest that the nucleation of deformation twins under ratcheting cycles should be controlled by the peak stress rather than the accumulation strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Gang Chen, Chengcheng Li, Mingwei Xie, Bingbing Li, Qiang Lin
Summary: A modified damage-coupled unified constitutive model based on the Abdel-Karim and Ohno model is proposed for 316LN stainless steel. The model shows validity in describing low-cycle fatigue and creep-fatigue interaction, and accurately simulates the cyclic stress response and hysteresis loops throughout the whole-life time.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
D. P. Rao Palaparti, V. Ganesan, J. Christopher, G. V. Prasad Reddy
Summary: The study focused on the tensile flow analysis of austenitic type 316LN stainless steel with varying nitrogen levels at different temperatures and strain rates. The results showed that the Ludwigson flow relationship accurately described the stress-strain behavior and work hardening response, with the increase in nitrogen content leading to higher strain hardening and diminished dynamic recovery. The Ludwigson equation was found to accurately predict flow stress and strength values compared to experimental data.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Y. Fan, H. G. Han, J. Y. Bao, X. Y. Wang, C. Hong, T. G. Liu, Y. H. Lu, T. Shoji
Summary: Long-term thermal aging at 400 degrees C significantly affected the density and structure of dislocations in wrought 316LN austenitic stainless steel, leading to changes in deformation mechanisms and mechanical behaviors. The formation of low-density dislocation multiples, coplanar dislocation arrays, stacking faults, and extended dislocations during aging shifted the dominant deformation process from dislocations slip and twinning to interaction with stacking faults.
MATERIALS CHARACTERIZATION
(2021)
Article
Engineering, Mechanical
F. Cui, Q. S. Pan, N. R. Tao, L. Lu
Summary: Introducing high density of nanotwins (NT) into metals is considered an effective strategy to achieve superior mechanical properties. Our study found that a heterogeneous structured 304 austenitic stainless steel with NT and micrometer-sized grains exhibited comparable fatigue strength and a larger fatigue limit/strength ratio compared to its counterpart with NT grains and dislocation structures, contrary to traditional fatigue theories. This superior high-cycle fatigue resistance is attributed to a weakened strain-localized fatigue mechanism where NT grains co-deform plastically with a large volume fraction of surrounding microsized grains with enhanced dislocation slipping and martensitic transformation.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Javad Mola, Guoqing Luan, Qiuliang Huang, Christiane Ullrich, Olena Volkova, Yuri Estrin
Summary: Discontinuous plastic flow due to dynamic strain aging in a Fe-13Cr-3.4Mn-0.47C metastable stainless steel was studied, with different mechanisms proposed for different temperature intervals. The study identified deformation-induced martensitic transformation and carbon diffusion as key processes in DSA at various temperatures.
Article
Materials Science, Multidisciplinary
A. R. Pavan, T. Sakthivel, B. Arivazhagan, M. Vasudevan, B. R. Vaishnavi Krupa
Summary: In this study, the creep deformation and rupture behavior of type 316LN stainless steel weld joints fabricated using different welding processes were investigated. The results showed that the weld joints exhibited higher deformation rate and lower creep rupture life compared to the base metal. The welding process significantly influenced the delta-ferrite content and creep cavity density in the weld metal, and the microstructural constituents significantly influenced the creep deformation and rupture strength of the joints. The HLM welding process exhibited the best creep rupture life.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Jingwei Zhao, Bingbing Li, Yiming Zheng, Mohammad Azadi, Xu Chen
Summary: A comparative study was conducted to investigate the low-cycle fatigue properties of 316LN austenitic stainless steel with and without a hold period at the maximum tensile strain. Creep-fatigue tests were performed at 550 degrees C with various hold periods at a constant strain amplitude. The study showed that dynamic strain aging, creep, and thermal recovery were the dominant deformation and failure behaviors. The introduction of a hold period increased stress relaxation and decreased the inelastic strain rate, leading to the accumulation of intergranular damage and the formation of dislocation cells.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Engineering, Mechanical
Bingbing Li, Yiming Zheng, Gang Chen, Takamoto Itoh, Xu Chen
Summary: The effects of strain amplitude on the isothermal fatigue and thermomechanical fatigue behaviors of 316LN stainless steel were studied and the physical mechanisms for the evolution of cyclic stress response were revealed. The manifestations of dynamic strain aging, dependence on loading modes and influence on deformation properties were discussed. A change in the dominated damage mechanism occurred at a strain amplitude of approximately 0.27%, where the isothermal fatigue and thermomechanical fatigue life curves intersected. The maximum stress was found to be an appropriate damage parameter for life prediction with a scatter band of 1.5.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Composites
Yue Liu, Jikang Li, Yue Kuang, Yongzhong Zhao, Min Wang, Hongtao Wang, Xu Chen
Summary: In this paper, carbon nanotube-modified carbon fibre/polyimide (CF/CNTs/PI) multi-scale composites were prepared by introducing amino-functionalized multi-walled CNTs into a PI resin matrix using an ultrasonic dispersion method. The interlaminar properties of the prepared composites were comprehensively evaluated by double cantilever beam (DCB), end-notched flexure (ENF), and short seam shear (SBS) tests. The addition of 0.5wt.% CNTs increased the Mode I and Mode II interlaminar fracture toughness of the material by 50.21% and 61.74%, respectively, and the interlaminar shear strength (ILSS) by 42.85%. The mechanisms of CNTs bridging the crack tip and enhancing the fibre/matrix interface bonding ability were dominant in improving the interlaminar properties.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hailong Dai, Shouwen Shi, Jiahui Tang, Can Guo, Zuoliang Ning, Xu Chen
Summary: The effect of heat treatment on the stress corrosion cracking of Monel 400 alloy in hydrofluoric acid vapor was studied using cracking crystallographic analysis. Different heat treatment temperatures have varying effects on the SCC of the alloy, with heat treatment increasing grain size and reducing residual strain. Large grains promote slip and active dissolution, increasing SCC susceptibility.
Article
Engineering, Mechanical
Shouwen Shi, Jianpeng Cui, Haiyan Li, Gang Chen, Qiang Lin, Xu Chen
Summary: The effect of temperature on the microcracking mechanisms of modified 9Cr-1Mo steel was investigated through low cycle fatigue tests conducted at 350 degrees C and room temperature (RT). At RT, the response of cyclic stress at low strain amplitude (<0.5%) is influenced by friction stress while at high strain amplitude it is dominated by back stress. In comparison, the disappearance of sub-grain boundaries due to dislocation annihilation occurs at 350 degrees C, resulting in a decrease in back stress and a more significant effect of back stress compared to RT. Due to the accumulated fatigue damage, the distance between two parallel extrusions at 350 degrees C is larger than at RT, which can be attributed to the disappearance of low angle sub-grain boundaries at 350 degrees C. As a result, microcracks initiate along high-angle grain boundaries at 350 degrees C instead of along low-angle grain boundaries observed at RT.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Xiaowen Wei, Zhe Zhang, Liting Shi, Jidong Kang, Xu Chen
Summary: Dissimilar material joined structures are increasingly used in the automotive industry to reduce weight. A mechanoresponsive luminogen-based method using an organic mechanochromic luminescence material is used to detect fatigue damage in coach peel Al-steel resistance spot welds. The fluorescence intensity increases linearly in the early stage of fatigue cycles and grows much faster in specimens with lower fatigue life. A new fatigue life prediction method has been developed based on the response of fluorescence intensity.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Engineering, Mechanical
Shouwen Shi, Haiyan Li, Jianpeng Cui, Xu Chen
Summary: The multiaxial low cycle fatigue behavior of nickel-based alloy 690 at 350 degrees C was studied. The presence of short-range order (SRO) and dynamic strain aging (DSA) contributes to the formation of multi-slip planar dislocation configuration under non-proportional loading paths. The effect of multiaxial loading paths on DSA was quantitatively evaluated based on average stress drop, with axial strain amplitude dominating and cross-slip strength weakening the effect.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Qingtong Wang, Bingbing Li, Jingwei Zhao, Takamoto Itoh, Xu Chen
Summary: Isothermal and thermomechanical fatigue tests were performed with different tension dwell times, and the cyclic stress response and stress relaxation behavior were analyzed using TEM and EBSD. The results showed that fatigue was the dominant mechanism for crack initiation and propagation in all creep-IF tests, leading to specimen fracture. However, in creep-TMF tests, when the dwell time increased to 1800 s, the dominant damage mechanism shifted to creep-fatigue interaction, resulting in intergranular fracture mode and a significantly shorter life. Additionally, a life prediction model based on tension strain energy was proposed.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Hailong Dai, Shouwen Shi, Can Guo, Zuoliang Ning, Yue Kuang, Xu Chen
Summary: The stress corrosion mechanism of Monel 400 alloy in HF vapor was investigated, considering the synergistic effect of HF vapor corrosion and dislocation sliding. The results revealed that oxygen-assisted corrosion in HF vapor worsens the fluorination effect and leads to severe fluorination degradation of Monel 400 alloy. The formation of CuF2 harms the Ni element in the matrix and results in denickelification. Dislocation sliding not only accelerates corrosion degradation but also facilitates the initiation of transgranular cracks by tearing the denickelification layer. A law of crack initiation based on the Schmid factor is proposed.
Article
Mechanics
Jinhui Feng, Zheng Liu, Shouwen Shi, Shaowu Feng, Gang Chen, Xu Chen, Qiang Lin
Summary: The embrittlement behavior of two modified 9Cr-1Mo steels in liquid LBE was investigated. The results showed that the modified steels had improved mechanical properties compared to the original steel, and the embrittlement mechanism was temperature-dependent.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Linhu Shi, Zhe Zhang, Xu Chen
Summary: This study investigates the fracture behavior of harmonic structured CoCrFeMnNi HEAs at room temperature and finds that the layered structure can enhance the resistance to crack growth and generate a higher crack growth rate.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Yue Liu, Jikang Li, Yue Kuang, Zheng Liu, Zhe Zhang, Xu Chen
Summary: In this study, carbon nanotubes (CNTs) were added to carbon fiber fabric reinforced polyimide composites (CF/PI) to investigate their monotonic bending properties and bending fatigue performance at room temperature. The results showed that CNTs can increase the bending strength and bending modulus of CF/PI, inhibit crack initiation and retard crack propagation, and enhance fatigue resistance.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
Xiaoran Wei, Kun Zhou, Shaowu Feng, Shouwen Shi, Qiang Lin, Gang Chen, Kai Song, Xu Chen
Summary: The research on degradation and failure of proton exchange membrane (PEM) is essential for studying cell failure. Automatic crack propagation tracking is necessary to provide detailed data on PEM fatigue behavior. CrackTracker, a Transformer-based model, was proposed to meet the specific characteristics of PEM and achieve high-performance crack tracking. Detailed comparisons with four widely used models demonstrated the superiority of CrackTracker in accuracy, efficiency, and generalization performance. Its fast inference speed and accurate detection of PEM cracks make it valuable for process safety management.
JOURNAL OF POWER SOURCES
(2023)
Article
Multidisciplinary Sciences
Tianguo Zhou, Xingyue Sun, Xu Chen
Summary: This study proposes a physics-guided modelling method to improve the generalization of artificial neural network (ANN) models on the prediction of multiaxial irregular cases. By introducing prior physical knowledge into the ANN model, the method achieves satisfactory performance and better extrapolation ability in predicting fatigue life. Compared with conventional models, the prediction errors are significantly reduced.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Zongchi Wang, Shouwen Shi, Jingtai Yu, Bingbing Li, Yajing Li, Xu Chen
Summary: In this paper, the cryogenic cyclic plastic strengthening (CCPS) method was used to strengthen 304 austenitic stainless steel, resulting in a material that combined multiscale structure and transformation-induced plasticity (TRIP) effect. After strengthening, harder small α'-martensite particles were formed in the austenite coarse grains, leading to dynamic strain partitioning during uniaxial tension tests at room temperature. Furthermore, martensitic transformation occurred steadily throughout the strain range of the tensile tests. At room temperature, the characteristics of cryogenic transformation were maintained and the saturation value of the transformation was increased. The strengthened material exhibited an excellent combination of high strength and ductility at room temperature.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Multidisciplinary
Jikang Li, Zheng Liu, Yue Liu, Yongzhong Zhao, Min Wang, Hongtao Wang, Xu Chen
Summary: In this paper, carbon fiber reinforced plastic was prepared using phenolic resin as the matrix by the molding method. The distribution of fibers inside the material and its influence on tensile fracture mechanism and creep properties were investigated. The experimental results show that horizontal specimens with a large number of fibers parallel to the tensile direction exhibit more excellent tensile properties. The difference in tensile fracture mechanism of horizontal and vertical specimens affects the creep properties of CFRP. Modified Time Hardening model can accurately fit all experimental data. Creep curves can be predicted based on the model parameters.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
