Super-high-strength and formable medium Mn steel manufactured by warm rolling process

Twip公司 材料科学 奥氏体 冶金 极限抗拉强度 可塑性 铁氧体(磁铁) 晶体孪晶 延展性(地球科学) 加工硬化 延伸率 沉淀硬化 降水 复合材料 微观结构 蠕动 气象学 物理
作者
Bin Hu,Binbin He,Guan-Ju Cheng,Hung‐Wei Yen,Mingxin Huang,Haiwen Luo
出处
期刊:Acta Materialia [Elsevier BV]
卷期号:174: 131-141 被引量:106
标识
DOI:10.1016/j.actamat.2019.05.043
摘要

In this paper, we demonstrate the design and manufacture of super-high strength medium Mn steel with good ductility, via the combination of warm rolling and V alloying. This new strategy could produce not only the extensive precipitation of fine VC particles in both ferrite and austenite but also the bimodal size distribution of retained austenite (RA) grains. A substantial increase of yield strength up to 650 MPa was achieved after the intercritical annealing of this V-alloyed medium Mn steel without deteriorating ductility; whereas the calculated precipitation strengthening using the classical Ashby–Orowan theory is no more than 400 MPa. Quantifying possible strengthening mechanisms revealed that dislocation strengthening should make an additional contribution because recovery in austenite could be strongly retarded by the nanosized precipitates. In this V-alloyed steel, the coarse RA grains firstly transformed to martensite during yielding at the much higher stress threshold, followed by a significant work hardening due to dislocations multiplication, twinning-induced-plasticity (TWIP) and transformation-induced-plasticity (TRIP) in the ultrafine RA grains. The best combination of strength and ductility included 1.5 GPa ultimate tensile strength and 28% total elongation. This was achieved due to the sustainable TRIP and TWIP effects in the later straining stage resulting from the ultrafine austenite grains, the latter were reversely transformed from the recrystallized ferrite grains.
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