Article
Materials Science, Multidisciplinary
Li Ma, Naiyou Xiao, Tao Jia, Jose A. Jimenez, Xiuhua Gao
Summary: The effect of processing route on the microstructure and tensile behavior of a V-microalloyed medium-Mn steel has been analyzed. The balance between different phases was found to be the most important factor affecting the strength and ductility of the steel. The presence of fresh martensite increased the strength of hot-rolled samples, while the presence of retained austenite improved the total elongation to failure of warm-rolled samples. The WRA sample showed optimal mechanical properties, with a yield strength of 808 MPa and an ultrahigh product of strength and elongation.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Xiliang Zhang, Shengjia Gai, Tao Liu, Yindong Shi, Yanhui Wang, Qian Zhou, Zhenguo Xing, Hongji Liu, Zhibo Zhai
Summary: A medium Mn steel with multi-gradient microstructure was treated using a pre-torsion and intercritical annealing treatment. The gradient structured sample exhibited improved strength and ductility compared to the homogenous counterpart, with an increase in yield strength and total elongation by approximately 49% and 68% respectively. The formation of a reverse gradient structure during tensile strain led to improved ductility through persistent TRIP effect and HDI hardening.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
X. K. Shang, Q. W. Guan, B. B. He
Summary: In this study, a dual-phase nanotwinned steel is proposed, which is fabricated through a deformation and annealing process. The steel exhibits high yield strength and total tensile elongation, but the annealing process reduces its ductility, possibly due to the formation of precipitates.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Chemistry, Physical
Lifeng Fan, Yulong Yang, Jiao Huang, Erbin Yue, Wenhao Hu, Jun Gao
Summary: Studies have shown that pre-stretching affects the morphology of ferrite, increases dislocation density and yield strength, and reduces the volume fraction of austenite, elongation, and the product of strength and elongation in cold-rolled 5%Mn medium manganese steel.
Article
Materials Science, Multidisciplinary
C. Hu, C. P. Huang, Y. X. Liu, A. Perlade, K. Y. Zhu, M. X. Huang
Summary: In this study, the tensile and fracture behaviors of a medium Mn steel fabricated by intercritical annealing (IA) and room-temperature quenching and partitioning (RT Q&P) processes were investigated. The IA steel consists of ultrafine-grained ferrite and austenite, while the RT Q&P steel is comprised of martensite matrix and retained austenite. The strain localization is moderate in the RT Q&P steel but highly localized in the IA steel, leading to premature decohesion and sudden fracture.
Article
Materials Science, Multidisciplinary
Hao Chen, Haifeng Xu, Tianpeng Zhou, Zejun Chen
Summary: A novel medium-Mn steel with excellent mechanical properties and microstructure evolution was successfully developed through specific processes.
Article
Metallurgy & Metallurgical Engineering
Bao-Jia Hu, Qin-Yuan Zheng, Chun-Ni Jia, Peng Liu, Yi-Kun Luan, Cheng-Wu Zheng, Dian-Zhong Li
Summary: By introducing precursor microstructure prior to normal austenite reverted transformation (ART) annealing, the intercritical annealing path in a 0.2C-5Mn medium-Mn steel can be optimized. Pre-annealing at high intercritical temperatures promotes precipitation and dissolution of carbides, accelerates austenite reversion, and assists in the formation of RA, leading to excellent strength-elongation balance in heat-treated samples.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Adam Skowronek, Adam Grajcar, Aleksandra Kozlowska, Aleksandra Janik, Mateusz Morawiec, Roumen H. Petrov
Summary: This study investigates the impact of heat-treatment processes on automotive medium-Mn sheet steels. A new method for calculating high-temperature phase equilibrium is developed and validated through experiments. The results show that the intercritical annealing temperature has a significant influence on the microstructure, chemical stability, and mechanical properties of the medium-Mn Al-alloyed steel.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Jiayun Zhang, Yunbo Xu, Dingting Han, Zelin Tong
Summary: This study proposes a novel concept of microstructure design involving warm rolling and low-temperature annealing to greatly enhance the strength-ductility combination of medium Mn steel. The results show that the unique transformation induced plasticity triggered by microbands and deformation twins significantly improve the ductility, while maintaining a reasonable dislocation density in non-recrystallized austenite grains that greatly increases the yield strength. Constitutive models are used to discuss the individual contributions of solid solution strengthening, grain boundary strengthening, V-precipitates strengthening, and dislocation strengthening to yield strength, with tangled dislocations playing a dominant role. The best strength-ductility combination is achieved, with comparable or superior yield strength, ultimate tensile strength, total elongation, and product of strength and elongation to reported medium-Mn steels.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Qiongying Cen, Weijun Wang, Bendao Zhang, Zijie Yan, Yang Wang, Mei Zhang
Summary: This study investigates the influence of nickel addition on the microstructure evolution and mechanical properties of medium Mn steel after intercritical annealing. The results show that nickel addition refines the grains and significantly increases the volume fraction of retained austenite. Furthermore, the partitioning behavior of nickel between ferrite and austenite during intercritical annealing greatly improves the mechanical stability of retained austenite, effectively enhancing the combination of tensile strength and elongation in the steel. Nanoindentation analysis further confirms the positive effect of nickel addition on the stability and mechanical responses of austenite, which is helpful for improving both the strength and plasticity of the steel.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
X. X. Dong, Y. F. Shen, Y. T. Zhu
Summary: A principle is proposed and verified that an optimized moderate strain hardening rate is desired for producing the best mechanical properties for metallic materials. It is demonstrated that moderate strain hardening rate is desired for better ductility and high yield strength in a medium carbon TRIP steel. By adjusting the temperature for bainitic transformation, the TRIP kinetics were tailored to produce moderated but long-lasting strain hardening for high ductility and high yield strength.
MATERIALS RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Aleksandra Kozlowska, Adam Grajcar, Krzysztof Matus, Aleksandra Janik, Krzysztof Radwanski, Wojciech Pakiela
Summary: Advanced High-Strength Steels (AHSSs) exhibit excellent combination of high strength, ductility and formability due to their complex microstructure and strain-induced martensitic transformation. The phase transformation behavior of these steels is significantly influenced by deformation temperature, with thermal stability of retained austenite being dependent on the deformation temperature. Moreover, dynamic recovery and carbide precipitation play a key role at higher temperatures.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Tianyu Zhang, Jun Hu, Chenchong Wang, Yu Wang, Weina Zhang, Hongshuang Di, Wei Xu
Summary: The study examines the impact of DCT on multiphase steel, revealing the transformation of blocky RA and the competitive relationship between bainitic transformation and nanoscale carbide precipitation during tempering. The yield strength of the DCT-treated steels is significantly increased due to the precipitation of nanoscale carbides and the elimination of unstable RA, showing the correlation between thermal and mechanical stabilities of RA during DCT and tensile strain.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Chenghao Song, Zhenshan Zhang, Wenyuan Wu, Haoliang Wang, Zhenzhong Sun, Yuhui Yang, Weifeng He, Juping Xu, Yuanguang Xia, Wen Yin, Zhiyan Cheng
Summary: This study investigated the effect of Si on the deformation behavior of martensite in hot-rolled medium Mn steels without any heat treatment. It was found that the addition of Si increased the dislocation density and decreased the crystallite size within martensite. The ultra-high ultimate tensile strength (UTS) and good ductility of the Si-added steel were attributed to the enhanced strain hardening rate caused by Si alloying and dislocation cell formation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Wenlu Yu, Lihe Qian, Xu Peng, Tongliang Wang, Kaifang Li, Chaozhang Wei, Zhaoxiang Chen, Fucheng Zhang, Jiangying Meng
Summary: By adding a small amount of Al, a medium-Mn steel with low Mn content of 2.7 wt.% was designed, which exhibited a large amount of retained austenite and persistent high strain hardening and superior mechanical properties during plastic deformation.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Mengyuan He, Nan Jia, Xiaochun Liu, Yongfeng Shen, Liang Zuo
Summary: The amplitude of the concentration wave in a Cantor alloy can be mechanically tailored under cyclic deformation, resulting in an enhancement of alloy strength. Atomic-scale mapping reveals that cyclic deformation can induce the clustering of solute atoms and promote interactions between dislocations and local solute clusters.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
W. Y. Xue, H. F. Zhang, Y. F. Shen, N. Jia
Summary: A Fe-10.5Mn-0.06C steel, fabricated via quenching and partitioning processing, exhibited different mechanical properties and deformation characteristics at various temperatures. The steel showed three-stage work-hardening behavior at low temperatures and two-stage work-hardening curves at higher temperatures, which were associated with the interactions between twinning, transformation, and dislocations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
X. X. Dong, Y. F. Shen, N. Jia, Y. T. Zhu
Summary: In this study, we investigated the mechanisms for improving the mechanical properties and retained-austenite stability of Q&P steel by adjusting the phase ratio. The yield strength of the steel increased with increasing annealing temperature, while the ductility initially increased and then decreased. These observations are closely related to the specific phase constituent and retained austenite stability produced by the Q&P process.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
C. Sun, Y. F. Shen, W. Y. Xue
Summary: By controlling the specific strain level, the deformation mechanisms of the warm-rolled steel were studied, revealing the steel's ultrahigh strength and ductility, which differs significantly from typical structural metallic alloys.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Jiahao Cheng, Xiaohua Hu, Drew Lancaster, Xin Sun, William Joost
Summary: A microstructure-based finite element computational model was developed to study the mechanical behavior of a plasma-sprayed aluminum-silicon/polyester coating used in gas turbine engines. The model successfully captured the plastic deformation and failure of the material, and was validated with experimental tests. It provides guidance for the design of improved abradable materials.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
J. W. Liang, Y. F. Shen, Y. Z. Li, X. W. Feng, G. D. Wang
Summary: This study investigates the mechanical behavior and microstructural evolution of ultrafine grained steel containing nanosized Fe3C and VC particles under different strain rates through tensile tests and microstructural analysis. The results show that the presence of nanosized particles enhances the peak stress of the steel, but at high strain rates, it may lead to softening behavior and reduced elongation to fracture.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
G. Q. Li, Y. F. Shen, N. Jia, X. W. Feng, W. Y. Xue
Summary: This study addresses the trade-off between strength and ductility in low-density delta-transformation-induced-plasticity steels by controlling the morphology and volume fraction of 8-ferrite. It is found that the thickness and volume fraction of 8-ferrite bands significantly influence the TRIP effect and the initiation and propagation of cracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Y. L. Wang, Y. F. Shen, N. Jia, J. J. Wang, S. -X Zhao
Summary: The mechanical properties of micro-alloyed gear steel can be improved through the fabrication route composed of carburizing and re-quenching. Different re-quenching temperatures significantly affect the sizes and morphologies of precipitates and martensite, as well as the ratio of low-angle grain boundaries to high-angle grain boundaries and dislocation densities. The highest ultimate tensile strength of 2420 MPa was achieved after re-quenching at 780 degrees C, while the steel re-quenched at 820 degrees C exhibited the highest yield strength of 1500 MPa.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
T. W. Yin, Y. F. Shen, W. Y. Xue, N. Jia, L. Zuo
Summary: This study investigates the microstructures and strengthening mechanisms of low-carbon low-manganese TRIP steel doped with rare earth element Ce. The results show that the addition of Ce refines the grain size, increases the density of dislocations, promotes the precipitation and refinement of cementite, and improves the yield strength and ductility of the steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zhufeng He, Yanxin Guo, Lifang Sun, Xianjun Guan, Shuang Jiang, Yongfeng Shen, Wen Yin, Xiaoli Zhao, Zhiming Li, Nan Jia
Summary: This study presents a universal strategy for designing ultrastrong and ductile face-centered cubic (fcc) multicomponent alloys by introducing interstitial-driven local chemical order (LCO) through simple thermomechanical processing. Fine laths containing interstitial-driven LCO domains have been observed in a prototype FeMnCoCrN alloy, resulting in an ultra-high yield strength of 1.34 GPa and a uniform elongation of 13.9%. This design strategy has also been successfully applied to a multicomponent austenitic steel, suggesting its potential in developing high-performance fcc materials at low cost.
Article
Nanoscience & Nanotechnology
X. X. Dong, Y. F. Shen
Summary: The effect of retained austenite stability and martensite-austenite island/fresh martensite on the mechanical properties, fracture behavior, and corrosion resistance of 0.5 wt.% C TRIP steel was studied. The results show that the morphology and volume fraction of retained austenite play a crucial role in determining the steel's comprehensive mechanical properties, while the presence of martensite-austenite island/fresh martensite and blocky retained austenite can lead to premature crack initiation and deterioration of corrosion resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
L. Y. Kan, Q. B. Ye, Y. F. Shen, Z. D. Wang, T. Zhao
Summary: This study investigated the influence of co-precipitation of nanosized Cu particles and carbides on the microstructures and mechanical properties of high strength low alloy steels. The results showed that the co-precipitation induced precipitation strengthening, leading to higher strength while maintaining good impact toughness. However, excessive nanosized Cu particles deteriorated the impact toughness. In addition, Cu addition inhibited the selection of martensitic variants and increased the fraction of high angle grain boundaries, which enhanced the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
X. X. Dong, Y. F. Shen, Y. T. Zhu
Summary: A principle is proposed and verified that an optimized moderate strain hardening rate is desired for producing the best mechanical properties for metallic materials. It is demonstrated that moderate strain hardening rate is desired for better ductility and high yield strength in a medium carbon TRIP steel. By adjusting the temperature for bainitic transformation, the TRIP kinetics were tailored to produce moderated but long-lasting strain hardening for high ductility and high yield strength.
MATERIALS RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
M. Y. He, Y. F. Shen, N. Jia, Peter K. Liaw, L. Zuo
Summary: Phase decomposition based on the immiscibility between Cu and Fe plays an active role in the mechanical properties of a carbon-doped CuFeMnNi high-entropy alloy. Annealing creates a dual-level heterogeneous microstructure with fine grains in the Fe-rich phase, coarse grains in the Cu-rich phase, and a transitional region at the junction. The alloy exhibits satisfactory ultimate tensile strength and excellent ductility, achieved through multistage strain-hardening mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Youzhi Li, Yongfeng Shen, Sixin Zhao, Weina Zhang, Wenying Xue
Summary: A medium-carbon low-alloy steel was prepared using asymmetric rolling process and its microstructure and mechanical properties were investigated. The results showed that compared to conventional symmetrical rolling, asymmetrical rolling significantly improved the strength without sacrificing ductility. The ASR-steel displayed higher yield strength and tensile strength compared to SR-steel, along with good ductility. The increased strength was attributed to the presence of ultrafine grains, dense dislocations, and nanosized precipitates as a result of the asymmetric rolling process.
