New observations of the twinning effect and austenite stability in intercritical quenched and tempered steel with high strength

Autor: Wanggang Zhang, Zhi-hua Zhuang, Wen-tao Xiao, Da-zhao Li, Shao-bin Bai, Yi-de Wang, Wei Liang
Rok vydání: 2021
Předmět:
Zdroj: Journal of Materials Science. 56:13801-13813
ISSN: 1573-4803
0022-2461
Popis: 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 Ludders 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.
Databáze: OpenAIRE
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