Article
Materials Science, Multidisciplinary
Peng Li, Wang Jian, Xudong Fang, Chao Chen, Peide Han, Yuping Li
Summary: The effect of tungsten on the precipitation and mechanical properties of 22Cr-25Ni austenitic heat-resistant steel during aging at 700 degrees C was studied. The addition of 2.5 wt% tungsten led to a decrease in the coarsening rate of Cr23C6 precipitates at grain boundaries and a more uniform distribution of Cu-rich phase and Z phase within the steel. The formation of high W-Cr23C6 inhibited the formation of nano-scale precipitate phases at grain boundaries, resulting in increased ductility.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Zhengyan Zhang, Zhenqiang Wang, Zhaodong Li, Xinjun Sun
Summary: The microstructure and precipitation behaviors of Nb and Nb-Mo microalloyed fire-resistant steels were investigated before and after tension at elevated temperature. It was found that the martensite and austenite islands disappeared after tempering, and nanometer-sized carbide precipitated. The precipitation of Nb increased in Nb-Mo steel after tempering, indicating that Mo promotes the precipitation of Nb.
Article
Materials Science, Multidisciplinary
En Tang, Qing Yuan, Rui Zhang, Zhicheng Zhang, Jiaxuan Mo, Wen Liang, Guang Xu
Summary: Increasing carburizing temperature of gear steel reduces carburizing time, saves energy, and improves workpiece efficiency. The study establishes the relationship between grain size and pseudo-carburizing parameters in Nb-Ti-Mo and Ti-Mo 20CrMnTi steel, and characterizes the evolution of carbonitride particles under different parameters. In-situ observation shows that addition of Nb in the Nb-Ti-Mo steel enhances resistance to grain coarsening at higher temperature. Martensite transformation in the steel proceeds gradually rather than instantaneously.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Chemical
Benyamine Benali, Aleksandra Saele, Na Liu, Martin A. Ferno, Zachary Paul Alcorn
Summary: This study investigates the stability of CO2 foam under high-pressure conditions using lab-on-a-chip technology. The researchers observe three different types of foam coarsening and find that type 3 coarsening leads to the most stable foam state. The experimental results also compare the stabilities of CO2 foam generated with different stabilizers.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Materials Science, Multidisciplinary
Minrui Ran, Qihan Wang, Yinsheng He, Hongyu Zhou, Yunhao Huang, Wenyue Zheng, Rui Tang
Summary: A new 20Cr-25Ni-Nb steel with Mo addition was developed and its oxidation behavior was investigated in a pure CO2 environment at 650 degrees C under 3.5 MPa. The results show that the Mo addition improved the oxidation resistance of the steel due to the synergistic effects of Nb and Mo during oxide scale formation. Although Mo promoted the outward diffusion of Nb, it had no significant influence on the overall structure of the oxide scales.
Article
Materials Science, Multidisciplinary
Pengyu Wen, Zhengzong Chen, Lixia Yang, Zedong Xie, Danqi Huang, Zhengdong Liu, Haiwen Luo
Summary: This study investigated the ripening kinetics of M23C6 carbide in P92, 9Cr, and 9Cr1W steels. It was found that the diffusivity of Cr and W and the interfacial energy of carbide and matrix played important roles in the coarsening process. The carbides in the coarse-grained steels showed a bimodal size distribution after tempering, with coarse particles at high-angle grain boundaries (HAGBs) and fine particles at low-angle grain boundaries (LAGBs). The two-cell model successfully reproduced the coarsening kinetics of the bimodal-sized particles during aging.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
M. J. Anderson, L. Liao, H. C. Basoalto
Summary: Accurately predicting the time evolution of precipitate size distributions is crucial for optimizing heat treatments and mechanical properties of engineering alloys. While mean-field models typically assume weakly coupled diffusion fields between neighbouring particles, this may not hold true in many applications. Correction factors are necessary to account for deviations from these assumptions.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Yinfei Ju, Huiyu Wang, Peng Sang, Zan Zhang, Kaiyue Li, Hongli Long, Yongsheng Li
Summary: In this study, the evolution kinetics of y'-Ni3Al phase in Ni-15Al-2Mo alloy under creep stress was investigated using phase-field modeling method, which revealed the directional diffusion of elements between y/y' phases. It was found that the increase of Al concentration and the decrease of Mo concentration both promoted the directional connection of y' phase. The difference of chemical potential and elastic potential between y phase and y' phase drove the elements directional diffusion between y/y' phases, with Mo playing a leading role.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Ceramics
Zanlin Cheng, Wenyu Lu, Lei Chen, Meng Li, Xuxu Han, Mei Li, Yujin Wang, Chengyu Zhang
Summary: The compressive creep properties of (Ti-Zr-Nb-Ta-Mo)C high-entropy ceramics were studied and found to exhibit higher creep resistance and steady-state creep rates compared to TaC. The creep mechanisms of the HEC involve dislocation motion, grain boundary sliding, and atom diffusion. Additionally, the atom diffusion is less active in (Ti-Zr-Nb-Ta-Mo)C due to sluggish lattice diffusion.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Yao Zhang, Jinlin Li, Hongyao Yu, Jiudong Sun, Zhenhua Wang, Qing Wang
Summary: The present study investigated the effect of Ti, Nb, or Ta addition on the microstructural stability of coherent gamma/gamma ' phases in designed high-temperature alloys. The results showed that the addition of Ti, Nb, or Ta not only reduced the size of gamma ' nanoparticles, but also improved the microstructural stability during aging, leading to enhanced mechanical properties.
JOURNAL OF MATERIALS RESEARCH
(2023)
Article
Physics, Multidisciplinary
Lu Meng-Tian, Li Jin-Lin, Sun Jiu-Dong, Wang Zhen-Hua, Wang Qing, Dong Chuang
Summary: Co-base superalloys have excellent mechanical properties and high-temperature oxidation and corrosion resistance. However, their structural stability can be compromised after long-term high-temperature aging. This study successfully achieved superior structural stability and mechanical performance through alloy composition design and special processing methods.
ACTA PHYSICA SINICA
(2022)
Article
Metallurgy & Metallurgical Engineering
A. E. Fedoseeva, I. S. Nikitin, R. O. Kaibyshev
Summary: By changing the quenching and tempering temperatures, the grain size of 9% Cr-1% W-1% Mo steel can be controlled, thus improving its creep resistance. Higher quenching and tempering temperatures can reduce the size of prior austenite grains and martensite laths, and increase the dispersion hardening effect of nanosized particles, thereby enhancing the creep resistance of the material.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Materials Science, Multidisciplinary
Rasim Eris, M. Vedat Akdeniz, Amdulla O. Mekhrabov
Summary: In the design and development of next-generation Ni-based superalloys, the addition of refractory impurity elements such as X = Mo or W atoms has been found to enhance bonding strengthening and structural stability of gamma and gamma ' phases. The study also suggests that larger atomic size X = W impurities may increase the precipitate volume fraction, leading to improved mechanical strength, while X = Mo atoms contribute to relatively strong bonding interactions within both gamma and gamma ' phases. Additionally, the slow-diffusing X = W atoms exhibit better bonding stability in the gamma matrix and at the gamma/gamma ' interface, resulting in a significant delay in precipitate coarsening.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Masuo Hagiwara, Tomoyuki Kitaura, Tomonori Kitashima
Summary: The present study aims to develop less expensive orthorhombic alloys by replacing some of the cost-prohibitive Nb in the Ti-27.5Al-13Nb alloy with Fe and/or Mo and adding a small amount of B. The study found that the addition of 0.1% B can refine the microstructure, but does not markedly improve ductility at room temperature. A duplex microstructure improves ductility and tensile strength.
MATERIALS TRANSACTIONS
(2022)
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)