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
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
Kun Wang, Xiaolu Gui, Bingzhe Bai, Guhui Gao
Summary: In this study, a C-Mn-Si alloyed bainitic steel was treated by bainitic austempering (BAT) process, which resulted in the formation of a multiphase microstructure consisting of bainitic ferrite, retained austenite (RA), and martensite/austenite. Tempering was employed to optimize the microstructure and mechanical response, leading to excellent combination of strength and ductility. The stability of RA was found to be significantly improved after tempering, attributed to the presence of nano-sized eta carbides that hinder the dislocation movement from the BCC matrix to RA, thus providing a shielding effect on RA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Feng Wang, Dongsheng Qian, Lin Hua, Lechun Xie
Summary: The tempering response and mechanical properties of austempered Cr4Mo4V steel were studied, showing improved properties with optimized austempering process but strict control of bainite content to prevent blocky RA and bainite coarsening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Y. B. Li, W. Ren, X. F. Yu, Y. Su, S. J. Wang, Y. Liu, S. Yang, W. J. Liu
Summary: The effects of austempering treatment on the formation of lower bainite, carbide precipitation, and mechanical properties of M50NiL bearing steel were studied using microstructure observation, microhardness, tensile, and rotating bending fatigue tests. Results showed that the treatment led to the formation of a multi-layer composite microstructure in the steel. This included lower bainite, martensite, and carbides in the surface layer, granular carbides, lower bainite, lath martensite, twin martensite, and thin film retained austenite in the sub-surface layer, and mainly lath martensite in the core region. Compared to traditional quenching treatment, austempering treatment resulted in more lower bainite formation in the surface layer, leading to refined microstructure, decreased grain size, and increased carbide precipitation and hardness. The rotating bending fatigue limit of the steel also increased after austempering treatment, while the tensile strength slightly decreased. The effects of austempering treatment on the mechanical properties were closely related to carbide precipitation behavior and lower bainite formation.
METALS AND MATERIALS INTERNATIONAL
(2023)
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
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
Materials Science, Multidisciplinary
Yuchen Du, Dongsheng Qian, Haichao Ren, Min Wu, Feng Wang
Summary: The effect of different bainite morphologies on the microstructure, mechanical properties, and wear properties of multiphase M50 steel has been investigated. The results show that the properly introduced lower bainite can significantly refine the lath structure, leading to the optimal mechanical and wear properties. This work provides a novel perspective to further improve the mechanical and wear properties of multiphase M50 steel by finely tailoring the bainite morphology.
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
Chemistry, Physical
Xiaokai Liang, Hang Fu, Mei Cui, Gang Liu
Summary: The effect of intercritical tempering temperature on the microstructure evolution and mechanical properties of medium manganese steel was investigated. The volume fraction of reversed austenite increased and then decreased with increasing tempering temperature. Lath-like reversed austenite improved toughness and plasticity, while block reversed austenite had a slight negative effect on them.
Article
Nanoscience & Nanotechnology
Xubiao Wang, Xiangze Zhang, Qiwen Fang, Hua Ma, Ruijie Zhang, Feng Liu, Zhinan Yang, Fucheng Zhang
Summary: In this study, the evolution of the mechanical stability of retained austenite (RA) and the strength-plasticity of nanostructured bainitic steel tempered at different temperatures were investigated. The results showed that the mechanical stability of RA decreased after tempering, and the poor deformation ability of the bainitic matrix resulted in low elongation in the steel. However, with increasing tempering temperature, the mechanical stability of RA decreased significantly and the elongation improved due to the improved deformation ability of the bainite matrix. The specimen tempered at 450 degrees C presented the optimum tensile mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Zhenghong Yao, Jin Hao, Weibing Dai, Changyou Li, Hongzhuang Zhang, Yimin Zhang
Summary: This study investigated the effects of different quenching mediums and tempering temperatures on the microstructures, mechanical properties, and fatigue behavior of EA4T steel. It was found that quenching with 5% salt water followed by tempering at 600 degrees Celsius significantly improved the material's fatigue behavior.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
Xiaohong Chu, Yan Zhao, Yuhuan Yang, Feng Zhou, Lei Liu, Zhengzhi Zhao
Summary: The effect of recrystallization on bainite transformation and mechanical properties of CH steel was investigated. It was found that precipitation hindered recrystallization, while a lower degree of recrystallization promoted bainite transformation and improved mechanical properties. During annealing, the samples showed grain refinement, increased dislocation, and strengthening from precipitation, leading to enhanced strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Qichao Ren, Ziming Kou, Juan Wu, Tengyan Hou, Peng Xu
Summary: In this paper, the influence of tempering temperature on the microstructure and mechanical properties of 35CrMo steel used in the hammerhead of piston-type impact pile hammer is analyzed. The results show that with the increase in tempering temperature, the microstructure of 35CrMo changes from tempered sorbite to lamellar martensite. The mechanical properties, such as strength and toughness, are affected by factors including dislocation density, matrix supersaturation, and grain size.
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
Materials Science, Multidisciplinary
Qi-wen Wang, Chang-sheng Li, Jie Chen, Xing-yang Tu
MATERIALS SCIENCE AND TECHNOLOGY
(2018)
Article
Materials Science, Multidisciplinary
Jie Chen, Changsheng Li, Xin Jin, Liqing Chen, Lei Fang
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2018)
Article
Materials Science, Multidisciplinary
J. Chen, C. S. Li, L. Q. Chen, L. Fang, S. B. Huo
MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK
(2019)
Article
Nanoscience & Nanotechnology
Jie Chen, Changsheng Li, Jinyi Ren, Xingyang Tu, Liqing Chen
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2019)
Article
Acoustics
Yang Liu, Jie Chen, Wei Xue, Dehua Zhu, Wenwen Liu, Yu Cao
Summary: The laser textured superhydrophobic cavity structure acoustic metasurface demonstrates excellent sound insulation performance underwater, providing an effective solution for controlling low-frequency acoustic waves and applications such as suppressing underwater noise propagation, acoustic stealth, and underwater detection.
Article
Engineering, Manufacturing
Changsheng Li, Jie Chen, Xingyang Tu, Yahui Han
Summary: The study found that decreasing finish rolling temperature can lead to the formation of complex microstructures, primarily composed of ferrite and cementite after tempering. The experimental steel exhibited excellent mechanical properties due to grain refinement, higher dislocation density, and dispersed precipitates, demonstrating a good combination of strength and toughness.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Materials Science, Multidisciplinary
Bohong Zhang, Jie Chen, Pengfei Wang, Bingtao Sun, Yu Cao
Summary: The inverse gradient-grained CoCrFeMnNi high-entropy alloy with desirable mechanical properties is fabricated using cold rolling and subsequent laser surface heat-treatment. This material exhibits a unique grain structure and improved strength-ductility combination. The laser surface heat-treatment technique further enhances the strength and ductility by controlling microhardness and thermal stress. This technique shows promise for producing gradient-structured materials without thickness limitation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Pengfei Wang, Jie Chen, Bingtao Sun, Dehua Zhu, Yu Cao
Summary: This paper investigates the microstructures and mechanical properties of CoCrFeMnNi high-entropy alloys treated by different annealing temperatures and times. The results show that the heterogeneity of grain size contributes to the excellent tensile properties and high strain hardening rate after yielding. Excessive annealing time reduces the content of ultrafine grains and decreases the strengthening effect of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jin-shan Chen, Zhen-xing Li, Ya-jie Chu, Jie Chen, Xin-jun Shen
Summary: The GCr15 steel was treated with laser surface treatment using a diode laser with a rectangular spot, and the microstructure distribution and peak temperature variation were analyzed. An empirical equation to predict the peak temperature at different depths was proposed, and an empirical model about grain coarsening was established.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Zhen-xing Li, Jin-shan Chen, Xiao-nan Wang, Xin-jun Shen, Yi-ming Cen, Jie Chen, Ya-jie Chu, Yu-jun Han
Summary: In this study, laser surface treatment of 65Mn steel was performed using a high-power diode laser. The distribution of microstructure, peak temperature, and hardened depth were analyzed based on numerical simulation. An empirical model was proposed to predict the hardened depth. The results showed that the martensitic microstructure near the outer surface of the hardened layer was coarser due to higher peak temperature. Hardness was influenced by depth, laser power, and scanning rate. The hardened layer increased resistance to bending deformation but decreased bending properties. Tempering at 150 degrees C slightly improved bending strength. Bending fracture consisted of three stages: microcrack initiation, intergranular crack propagation, and ductile fracture in substrate region.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Physics, Multidisciplinary
Zihao Liu, Xiaopeng Zhou, Jie Chen, Yifeng Chen, Wei Xue, Yu Cao
Summary: Band-pass frequency selective surfaces are widely used for radar electromagnetic wave detection stealth performance, and the challenge lies in empowering both microwave frequency and thermal transparency. By introducing a periodic filled region, thermal transparency can be achieved, and the designed FSSs have less-distortion frequency response and thermal transparency, providing an effective approach for microwave and infrared camouflage design and fabrication.
Article
Materials Science, Multidisciplinary
Jie Chen, Changsheng Li, Jinyi Ren, Xingyang Tu, Yu Cao
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
