Article
Materials Science, Multidisciplinary
T. W. J. Kwok, F. F. Worsnop, J. O. Douglas, D. Dye
Summary: Carbon is a well known austenite stabiliser and can be used to alter the deformation mechanisms in medium Mn steels, such as TRIP or TWIP + TRIP effects. The effect of carbon beyond quasi-static tensile behavior is less understood. In this study, medium Mn steels with different carbon contents were processed to form different microstructures. The low carbon steel exhibited higher Charpy impact energy compared to the high carbon steel, indicating that the use of carbon to promote TWIP + TRIP behavior should be avoided in alloy design.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Jun Zhang, Mingxin Huang, Binhan Sun, Boning Zhang, Ran Ding, Cheng Luo, Wu Zeng, Chi Zhang, Zhigang Yang, Sybrand van der Zwaag, Hao Chen
Summary: The effect of Lfiders banding on hydrogen embrittlement susceptibility of medium Mn steels was investigated by varying the degree of yield point elongation. It was found that steels with a larger YPE were more susceptible to hydrogen embrittlement. The presence of Lfiders banding and localized deformation play a key role in influencing the overall hydrogen embrittlement susceptibility of medium Mn steels.
SCRIPTA MATERIALIA
(2021)
Review
Materials Science, Multidisciplinary
Shuo-shuo Li, Hai-wen Luo
Summary: This paper discusses the application of hot forming in the automotive industry, focusing on different steel grades and their advantages, particularly comparing medium-Mn steels with the popular 22MnB5 in hot forming. Future research should address technological challenges in hot forming of medium-Mn steels to facilitate commercialization.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Xiao Shen, Hanmeng Qiao, Wenwen Song, Wolfgang Bleck
Summary: The Fe-5Mn-2Al-0.1C and micro-alloyed Fe-5Mn-2Al-0.1C-0.1Nb-0.2V medium Mn steels were processed using a novel flash-austenite-reverse-transformation (ART) annealing. A core-shell Mn-gradient in austenite was observed and characterized at near-atomic scale using atom probe tomography. Compared to conventional ART annealing, the flash-ART process doubled the austenite fraction in both materials based on electron backscattering diffraction measurement. The rapid austenite reversion in flash-ART annealed medium Mn steels is attributed to negligible partitioning local equilibrium controlled austenite kinetics, while the formation of the core-shell Mn-gradient is caused by different austenite growth kinetics and interface mobilities. Microalloying elements were found to form nano-carbides, which decelerate austenite reversion and retard austenite growth.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
J. Tabin, K. Nalepka, J. Kawalko, A. Brodecki, P. Bala, Z. Kowalewski
Summary: A remarkable plastic flow instability is observed during tensile deformation of the commercial 304 stainless-steel sheet at room temperature. The occurrence of plastic flow instability in 304 is dependent on the strain rate and specimen gage length. Moreover, the enhanced strain hardening resulting from deformation-induced martensitic transformation facilitates the orderly propagation of the strain-localized band.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
J. S. Rodriguez, J. F. Duran, Y. Aguilar, G. A. Perez Alcazar, R. M. Souza, O. A. Zambrano
Summary: This study investigates the dynamic recrystallization and microstructural evolution of advanced high-strength steels. It is found that the aluminum content influences the dynamic recrystallization process and increasing aluminum content favors grain refinement.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Qinyi Guo, Hung-Wei Yen, Haiwen Luo, Simon P. Ringer
Summary: Through numerical simulation and experimental comparison, this study found that solute manganese in medium manganese steel can rapidly partition to near-equilibrium concentration values during short intercritical annealing, and proposed a new concept of fluctuational interface mobility at the austenite/ferrite interface.
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
Zhiqiang Wu, Shuai Liu, Md Nazmul Hasan, Eric Li, Xianghai An
Summary: The hot deformation behavior and microstructure evolution of Fe-Mn-Al-C steel with lamellar ferrite and equal axial shape austenite heterostructures were studied. The thermal compression test was conducted at temperatures ranging from 800 degrees to 1000 degrees C and a strain rate ranging from 0.01 to 10(1) s(-1). The steel exhibited superior peak strengths at different temperatures compared to other traditional steels, with a maximum compression strength of 533 MPa achieved at 800 degrees C-10 s(-1). The processing conditions for the austenite-ferrite heterostructured steel were optimized to a temperature of 900-1000 degrees C and a strain rate of 0.01-0.1 s(-1).
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Joonoh Moon, Seong-Jun Park, Chang-Hoon Lee, Hyun-Uk Hong, Bong Ho Lee, Sung-Dae Kim
Summary: Four alloys based on the Fe-30Mn-(8.5-12)Al-(1.0-1.3)C (wt%) system were studied to investigate the effects of microstructure evolution and x-carbide precipitation behavior on the hot ductility of austenitic lightweight steels. It was found that at high temperatures above 1000 degrees C, dynamic recrystallization occurred, leading to high tensile ductility. However, at temperatures of 700-900 degrees C, the ductility decreased due to the intragranular precipitation of x-carbide, which was exacerbated by higher Al and C contents. The addition of Cr and Mo suppressed the precipitation of x-carbide and reduced ductility loss.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Josef Nemec, Lenka Kuncicka, Petr Opela, Karel Dvorak
Summary: Austenitic stainless steels, including ChN35VT steel, have wide application potential in various fields, such as the nuclear power industry. This study experimentally characterized the deformation behavior of ChN35VT steel under hot conditions and compared it with 08Ch18N10T steel. The results showed that ChN35VT steel exhibited significantly higher flow stress values.
Article
Materials Science, Multidisciplinary
Xiaohong Hao, Xiaowen Sun, Ting Zhao, Shenghan Shen, Yuefeng Wang, Tiansheng Wang
Summary: The present study investigated the hot compression deformation behavior of Fe-18.5Mn-7Cr-0.6C and Fe-18.5Mn-7Cr-0.6C-0.21N high-Mn austenitic steels, and analyzed the factors influencing their deformation. The results showed that the addition of N enhanced the strain rate sensitivity, high temperature strength, and hot deformation activation energy of the high-Mn austenitic steel.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Nathan A. Ley, Marcus L. Young, B. Chad Hornbuckle, Daniel M. Field, Krista R. Limmer
Summary: This study investigates the toughness and phase stability of Fe-Mn-Al-C steel using various microscopy and X-ray diffraction techniques, as well as examining the impact of heat treatments on the matrix and precipitates. Comparisons with CALPHAD predictions and the proposed mechanisms for improving strength and toughness in age-hardenable Fe-Mn-Al-C steels are also presented in the study.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Review
Materials Science, Multidisciplinary
Juan Li, Cuirong Liu, Yaohui Song, Guanghui Zhao, Lifeng Ma, Qingxue Huang
Summary: The influence of hot rolling and heat treatment on the microstructure and mechanical properties of NM500/Q345/NM500 composite plates was investigated in this study. It was found that increasing the rolling reduction promoted metallurgical bonding between the steels and post-quenching treatment enhanced the texture components, resulting in improved tensile strength and elongation in the composite plate.
JOURNAL OF MATERIALS SCIENCE
(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)
