Abstract
To optimize the formability and strength of hot-rolled Fe-10Mn-0.4C-2Al-0.6 V medium Mn steel, intercritical quenching and tempering processes were carried out. The strength of the steel was enhanced, and the Lüdders platform was eliminated. The higher strength of the steel was attributed to the occurrence of a complex twinning effect, martensitic transformation and V-carbide precipitation during tensile deformation. In particular, the twin martensite structure retained after the quenching-tempering process served as another previous twin to accelerate the generation of nanomechanical twins in recrystallized austenite grain. The occurrence of transformation-induced plasticity (TRIP) of austenite with poor stability in non-recrystallized regions stimulated the TRIP and twinning-induced plasticity (TWIP) effects in austenite with high stability in recrystallized regions. Therefore, two pathways to improve the formability and optimize the mechanical properties of medium Mn steel by adjusting the quenching and tempering processes were proposed in this paper: (1) Manufacturing more martensite twin structures and (2) regulating the balance of austenite stability in both recrystallized and non-recrystallized regions.
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This work was financially supported by the Project of International Cooperation in Shanxi (Grant Number 201603D421026) and the Natural Science Foundation of Shanxi Province (Grant Number 201801D121105).
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The author Shaobin Bai was responsible for the writing of the manuscript; the authors Wentao Xiao and Zhihua Zhuang were responsible for all the experiments. The author Yide Wang provided experimental materials and experimental scheme; the author Dazhao Li provided helpful analysis and modification on the manuscript; the author Wanggang Zhang was responsible for the modifying of the manuscript; the authors Wei Liang and Dazhao Li gave technical and financial support.
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Bai, Sb., Xiao, Wt., Wang, Yd. et al. New observations of the twinning effect and austenite stability in intercritical quenched and tempered steel with high strength. J Mater Sci 56, 13801–13813 (2021). https://doi.org/10.1007/s10853-021-06136-1
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DOI: https://doi.org/10.1007/s10853-021-06136-1