Article
Materials Science, Multidisciplinary
S. Haribabu, C. Sudha, V. Srihari, S. Raju
Summary: The study investigated the austenitic transformation and the effect of prior ferrite formation on martensite transformation characteristics of 0.48 wt% Al-added P91 steel. It was found that elemental segregations played a significant role in the gamma-austenite formation process. These findings provide insights into the complex interactions between different phases in the steel alloy during heat treatments.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Nuclear Science & Technology
G. J. Zhang, Y. Zhou, J. F. Yang, H. Y. Yang, M. M. Wang, K. Jing, Z. M. Xie, L. C. Zhang, R. Liu, G. Li, H. Wang, L. Li, Q. F. Fang, X. P. Wang
Summary: 9Cr-F/M-xSi (x = 0-1.0 wt%) steels with a ferrite/martensitic structure and precipitated M23C6 and MX phases were fabricated and characterized. The addition of silicon led to an increase in ultimate tensile strength and hardness, while the total elongation remained constant. The solid solution strengthening mechanism played a more significant role than carbide precipitation. These findings have implications for the composition design of materials for nuclear reactors.
NUCLEAR MATERIALS AND ENERGY
(2023)
Article
Nanoscience & Nanotechnology
Xiangyu Xu, Xuemin Wang, Jianzhe Li, Zepeng Yan, Dan Liu, Qiannan Liu, Chengjia Shang, Jianxun Fu, Ping Shen
Summary: The hot-working behavior of a low-density Fe-4Al-1Ni ferritic steel at the deformation temperature in the range of 700-950 degrees C and the strain rate in the range of 0.01-10 s(-1) was studied, including the deformation mechanism, apparent deformation activation energy, and recrystallization behavior. The experimental results showed that increasing temperature and strain rate contribute to the occurrence of discontinuous dynamic recrystallization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
M. Pinson, H. Springer, K. Verbeken, T. Depover
Summary: The addition of 2% aluminium to a martensitic Fe-0.4C steel forms a ferritic microfilm, enhancing ductility without affecting bulk hardness. The presence of aluminium delays hydrogen-induced fractures and redirects crack propagation, resulting in intergranular fracture surfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jaclyn L. Cho, C. Cem Tasan
Summary: In V45Ti30Ni25 (at. pct) alloy, superelastic TiNi and a stable V-rich bcc phase (beta) coexist in multiple-phase mixtures as matrix and precipitate. Through various tests, it is found that the phase mixtures exhibit similar strain-partitioning behaviors but different dependencies of reverse transformation on strain. These findings provide insights for improved damage resistance in the presence of a superelastic phase.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Fazlollah Sadeghi, Tahereh Zargar, Jong Wan Kim, Yoon-Uk Heo, Jae Sang Lee, Chang Hee Yim
Summary: Chemical and microstructural analyses were conducted on Ni depletion zones in 304 austenitic stainless steel sheets after annealing and cooling at different rates. The study focused on the characteristics and origin of the retained 6-ferrite and ??-martensite phases, with observations of athermal martensite growth and the promotion of martensitic transformation with reduced Ni content. The research confirmed the growth of athermal martensite within twinning boundaries with a specific orientation relationship with the austenite matrix.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Krishna Yaddanapudi, Marko Knezevic, Subhash Mahajan, Irene J. Beyerlein
Summary: The study reveals that after CBT processing, nano-twins are found in the martensite regions of the DP 1180 steel sheet, while the lath-shaped martensite remains twin-free; as plastic strain increases, dislocation density in the ferrite matrix also increases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Fan Zhao, Xinhua Liu, Zhihao Zhang, Jianxin Xie
Summary: This study investigates the effect of nitrogen content on the microstructure, mechanical properties, and deformation behaviors of a medium-carbon ferritic-pearlitic steel. The results show that nitrogen addition has little effect on the microstructure but coarsens the steel slightly. While nitrogen is a strong element for solid solution strengthening, its addition only marginally improves the strength of the steel and has little effect on its ductility. However, the toughness of the steel is significantly decreased by the addition of nitrogen. The yield-point phenomenon in the tensile process is first strengthened and then weakened as the nitrogen content increases. This phenomenon is closely related to the dislocation behaviors in proeutectoid ferrite and influenced by the dislocation locking effect caused by interstitial nitrogen atoms and the dislocation pinning effect caused by Fe3N phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nuclear Science & Technology
Leran Liu, Guoping Yang, Hongbin Liao, Jialin Gong, Long Zhang, Xiaoyu Wang
Summary: Thermal creep experiments were carried out on Chinese low-activation ferritic/martensitic steel (CLF-1 steel) at different temperatures and normal stress levels. The results were analyzed in terms of creep curves, microstructure, and creep properties. The samples showed adequate fracture surfaces and no difference in creep behavior between different thicknesses of CLF-1 steel plate. Microstructure analysis revealed the presence of tempered lath martensite structure and carbides. The results demonstrate the successful progress of CLF-1 steel R&D work and its relevance to the CN-HCCB-TBM project.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Bo Xiao, Haokai Dong, Tao Yang, Shaofei Liu, Shenbao Jin, Boxuan Cao, Yongdian Han, Lei Zhao, Xiawei Yang, Gang Sha, Lianyong Xu
Summary: We present two typical morphologies (elongated- and blocky-shaped) of the Laves phase in tempered martensite ferritic steels during creep process, which are formed through two independent paths: grain boundaries and neighboring M23C6. The presence of multi-element segregation (Cr, Mn, Si, and W) at grain boundaries and adjacent M23C6 provides a source of Laves phase formation. Additionally, different growth mechanisms play crucial roles in the formation of these two morphologies. Our findings enhance the understanding of Laves phase heterogeneous precipitation and offer insights for the development of novel heat-resistant steels with superior creep strength.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Minghao Huang, Lingyu Wang, Chenchong Wang, Anna Mogucheva, Wei Xu
Summary: Deformation-induced martensitic transformation (DIMT) is considered as a key strengthening mechanism in advanced high-strength steels (AHSS). However, systematic investigations on the transformation at high strain-rates are limited due to experimental difficulties. In this study, interrupted Charpy tests were conducted to study the transformation sequence of DIMT under high strain-rates. The results revealed that the nucleation sites and morphology of transformed alpha'-martensite changed with the increasing austenite grain sizes (AGSs), and the transformation sequence can be explained by considering the stacking fault energy and twinning nucleation stress of austenite.
MATERIALS CHARACTERIZATION
(2022)
Article
Thermodynamics
Raj Narayan Hajra, Manmath Kumar Dash, Woong Chu, A. N. Singh, Kyung-Wan Nam, Jeoung Han Kim
Summary: The high-temperature phase stability and phase transformation characteristics of ferritic/martensitic steel were studied using DSC and EBSD. The results showed that γ-austenite completely transformed to δ-ferrite during austenitization beyond 1523 K. The absence of martensite transformation was observed at a certain annealing condition.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Nanoscience & Nanotechnology
Xiaowen Sun, Dongyun Sun, Yuefeng Wang, Yiting Feng, Long Jin, Xiaohong Hao, Tiansheng Wang, Fucheng Zhang
Summary: In this study, the influence of microstructural features on strain distribution and TRIP effect in multiphase steel was investigated. The results show that the strain partitioning in the multiphase microstructure is different depending on the presence of pre-formed martensite. The introduction of pre-formed martensite enhances the TRIP effect and promotes uniform strain partitioning, thereby improving the plasticity of the multiphase steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Mattis Seehaus, Sandra Korte-Kerzel, Stefanie Sandloebes-Haut
Summary: The effect of silicon on the microstructure and carbon distribution in martensitic steels is investigated in this study. It is found that silicon forms a sigmoidal distribution at the phase boundary, acting as a barrier for carbon segregation. The addition of silicon inhibits carbide formation and reduces carbon partitioning into the austenite phase.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Prashant Pathak, Ilana Timokhina, Subrata Mukherjee, Gregory S. Rohrer, Hossein Beladi
Summary: The crystallographic properties of interfaces in dual-phase steel were investigated, showing that the distribution of interfaces was influenced by the dominant phase transformation mechanism, leading to anisotropic grain boundary plane distribution.
JOURNAL OF MATERIALS SCIENCE
(2021)
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)