Article
Nanoscience & Nanotechnology
Xiaowen Sun, Yuefeng Wang, Dongyun Sun, Xin Jia, Ting Zhao, Fucheng Zhang, Tiansheng Wang
Summary: In this study, the microstructure and mechanical properties of Si-H13 nanobainite steel subjected to multi-tempering processes were investigated. The results showed that multi-tempering increased the yield strength and led to secondary hardening due to precipitation strengthening. However, the increase in thickness of bainitic ferrite laths was minimal.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Xiaodong Tan, Wenjun Lu, Ning Guo, Bo Song, Xi Rao, Yunbo Xu, Shengfeng Guo
Summary: We performed a direct quenching and dynamical partitioning process on a low-carbon low-alloy steel. By investigating the effect of tempering and partitioning treatment, we found that carbon partition upon tempering enhances the mechanical stability of retained austenite and promotes the TRIP effect to occur at higher true strain level. Additionally, the presence of carbon-enriched stable retained austenite after necking enhances the post necking elongation of the steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Metallurgy & Metallurgical Engineering
De-Zhen Yang, Zhi-Ping Xiong, Chao Zhang, Guan-Zheng Feng, Zhi-Fang Cheng, Xing-Wang Cheng
Summary: Increasing tempering temperature leads to the coarsening of transition carbides and their increased amount, a decrease in dislocation density in martensitic laths, and a reduction in the fraction of retained austenite.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Yunchao Li, Engang Wang, Lin Zhang, Yves Fautrelle, Xue Zhao, Xiao Guo, Daoqi Zhang
Summary: This study investigated the microstructure and mechanical properties of 60Si2CrVNb spring steel under different quenching and tempering processes. The results showed that the highest ultimate tensile strength and yield strength were achieved through austenitization at 900 & DEG;C and subsequent tempering at 350 & DEG;C. The optimal combination of mechanical properties was obtained by quenching at 900 & DEG;C for 30 min and tempering at 400 & DEG;C for 90 min, with improved tensile strength and plasticity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Pavel Salvetr, Andrea Skolakova, Jakub Kotous, Jan Drahokoupil, Daniel Melzer, Zdenek Jansa, Crtomir Donik, Aleksandr Gokhman, Zbysek Novy
Summary: The present study aimed to investigate the properties of medium-carbon steel during tempering treatment and to enhance the strength of medium-carbon spring steels using strain-assisted tempering (SAT). The effects of double-step tempering and double-step tempering with rotary swaging (SAT) on mechanical properties and microstructure were examined. The results showed that SAT treatment significantly increased the yield strength of the medium-carbon steel samples, while reducing the plastic properties such as elongation and reduction in area compared to the double-step tempering treatment. Grain boundary strengthening and lower dislocation strengthening contribution were observed in the SAT samples.
Article
Materials Science, Multidisciplinary
Gangsheng Xie, Lijuan Shen, Shuqing Xing, Yonglin Ma, Yongzhen Liu, Zhongyi Chen
Summary: The dissolution behavior of carbides and the proliferation of dislocations during the quenching process of GCr15 steel were studied under single temperature field and magnetic-thermal coupling field. The results showed that the pulsed magnetic field aided in the dissolution of carbides, reducing the number of undissolved carbide particles and increasing the dislocation density. According to the kinetics theory, the migration frequency of carbon atoms to the gap position increased, leading to an accelerated diffusion of carbon atoms in the matrix when a pulsed magnetic field was applied.
Article
Materials Science, Multidisciplinary
Enyinnaya G. Ohaeri, Tonye Jack, Sandeep Yadav, Jerzy Szpunar, Jiming Zhang, Jinbo Qu
Summary: Heat treatment is suggested to improve microstructural properties for steels. Different quenching rates in brine and oil led to variations in microstructures, affecting the hardness values obtained after heat treatment. The quenching and tempering approach relieved high stored energy and retained key properties for safe pipeline operation, with reduced risks of HIC in oil quenched pipeline steels.
PHILOSOPHICAL MAGAZINE
(2021)
Article
Chemistry, Physical
Pavel Salvetr, Aleksandr Gokhman, Zbysek Novy, Petr Motycka, Jakub Kotous
Summary: The study investigated the influence of various silicon contents and copper addition on the behavior of 1.7102 steel, finding that copper improves the reduction of area during tempering between 150 and 300 degrees C, while a silicon content of 1.5 wt% is optimal for the materials under study, resulting in increased strength upon tempering at 500 degrees C.
Article
Metallurgy & Metallurgical Engineering
Cong-peng Kang, Fu-bin Liu, Huai-bei Zheng, Hua-bing Li, Zhou-hua Jiang, Kui Chen, Hao-yang Suo, Xin-hao Yu
Summary: The study investigates the microstructure evolution of quenching and tempering heat treatment in high nitrogen martensitic stainless steel, finding an optimal heat treatment process for outstanding mechanical properties. The main precipitates in the steel are carbon-rich type M23C6 and nitrogen-rich type M2N. The fracture mode transitions from brittle to ductile with increasing tempering temperature.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yixin Xie, Xiaonong Cheng, Jiabo Wei, Rui Luo
Summary: Carbide precipitation and coarsening in quenched Dievar steel during tempering are investigated. It is found that carbides become coarser on tempering, with the sizes for inter-lath carbides increasing noticeably and the sizes for intra-lath carbides remaining nearly constant.
Article
Materials Science, Multidisciplinary
Ying Sun, Lianfang He, Yuyang Gao, Shuo Fang, Zhichao Li, Huiping Li
Summary: This paper investigates the influence of induction quenching and tempering temperatures on the mechanical properties and microstructure evolution of 45 steel for linear guides. The results show that the tempering temperature has a significant effect on the hardness and tensile strength, with a decrease in hardness and an increase in tensile strength after tempering. The quenching temperature has a significant effect on the impact toughness, with a steady decline in impact toughness as the quenching temperature rises.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
Xubiao Wang, Changbo Liu, Yuman Qin, Yanguo Li, Zhinan Yang, Xiaoyan Long, Mingming Wang, Fucheng Zhang
Summary: This research focused on the microstructure evolution and mechanical properties of nanostructured bainite tempered at different temperatures. The results showed that bainitic transformation occurred in retained austenite between 210-320 degrees C. At higher temperatures, cementite precipitated from retained austenite, reducing its stability and leading to stress-induced martensitic transformation during deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Ting Chen, Zhanxiang Ling, Min Wang, Liang Kong
Summary: By applying a suitable post-weld tempering pulse, the nugget microstructure of RSWs in Q&P1180 steel can be optimized, resulting in improved mechanical properties, especially in cross-tension and tensile-shear tests. The post-weld tempering treatment optimizes the microstructure of the nugget, reducing hardness and increasing toughness, thereby enhancing the weld's resistance to tension and shear.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yu Wang, Yongxin Jian, Rongbo Xu, Quansheng Wang, Xiaoming Zhang, Wenjing Dang, Zhifu Huang
Summary: The microstructure evolution and mechanical properties of P92 steel welded joint have been investigated in relation to the number of tempering cycles. The phase composition of the base metal, heat-affected zone, fusion zone, and weld metal is similar, with the presence of martensite laths, M23C6 precipitates, and tiny MX phase. However, delta-ferrite patches are found in the fusion zone. Increasing the number of tempering cycles leads to an increase in the area fraction and average size of M23C6 precipitates in the heat-affected zone and fusion zone. This results in a decrease in hardness, ultimate tensile strength, and yield strength, while the elongation improves to some extent. The reduction in solution strengthening, grain refinement strengthening, and precipitation strengthening is responsible for the strength degeneration of P92 steel welded joint with reduplicative tempering.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
S. Santhosh Kumar, S. Ramesh Kumar
Summary: The research focuses on using heat treatment techniques to modify T92 martensitic steel, and finds that its microstructure changes after normalization at 1000 degrees C for an hour and tempering at 760 degrees C for 2 hours. The changes are characterized using X-ray diffraction, scanning electron microscopy, and optical microscopy, and the tensile strength, hardness, and toughness are tested. It is observed that normalizing at 1000 degrees C increases the strength and hardness of the T92 material, while tempering at 760 degrees C decreases them. Among different cooling techniques, tempering at 760 degrees C with air cooling achieves the optimal combination of tensile strength (887 MPa), hardness (267.42 HV), and toughness (135 J).
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(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)