On the role of austenite stability in yielding behavior of a medium Mn steel with a duplex austenite-martensite microstructure

被引：5

作者：

Wang, Yan ^{[1
]}

Zhang, Youyou ^{[1
]}

Gong, Wu ^{[2
]}

Rong, Xuequan ^{[1
]}

Harjo, Stefanus ^{[2
]}

Wu, Wenhua ^{[1
]}

Lu, Qi ^{[3
]}

Nakada, Nobuo ^{[4
]}

Yang, Zhigang ^{[1
]}

Chen, Hao ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat, Minist Educ, Beijing, Peoples R China

[2] Japan Atom Energy Agcy, J PARC Ctr, Tokai, Ibaraki 3191195, Japan

[3] Shanghai Li Auto Technol Co Ltd, Shanghai 201805, Peoples R China

[4] Inst Sci Tokyo, Dept Mat Sci & Engn, Tokyo 2268503, Japan

来源：

ACTA MATERIALIA | 2025年 / 288卷

基金：

北京市自然科学基金; 中国国家自然科学基金;

关键词：

Medium Mn steels; Austenite stability; L & uuml; ders band; Mechanical properties; Chemical heterogeneity; Phase transformation; LUDERS; ULTRAFINE; STRAIN; TRANSFORMATION; DEFORMATION; TRIP; ELONGATION; DUCTILE; BANDS;

D O I：

10.1016/j.actamat.2025.120840

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Low yield strength and the presence of L & uuml;ders bands constitute principal impediments to the extensive applications of conventional medium Mn steels with a duplex microstructure of ferrite and austenite. Flash heating and the concept of chemical heterogeneity have been combined to engineer a duplex austenite-martensite microstructure in medium Mn steels, which has proven effective in augmenting the yield strength and mitigating the occurrence of L & uuml;ders bands. However, the underlying mechanisms remain ambiguous. In the present work, the effect of austenite stability on yielding behavior was systematically investigated in an austenitemartensite duplex medium Mn steel with a chemical composition of Fe-0.18C-4.95Mn-0.4Si (wt.%). Austenite stability was identified as the critical factor governing yield strength, where reduced stability promotes early-stage deformation-induced martensite transformation, thereby decreasing yield strength. Diminished austenite stability may as well induce enhanced work hardening, thereby result in the inclination and eventual elimination of yield plateau, concomitant with the disappearance of L & uuml;ders bands. These observations expand our current understanding of the yielding behavior in medium Mn steels and offer insights for the design of other advanced high strength steels.

引用

页数：14

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