Ultrahigh impact toughness achieved in high strength bainitic ferrite/ retained austenite lamellar steels below-Mf temperature

被引：11

作者：

Wang, Kun ^{[1
]}

Hu, Feng ^{[1
]}

Zhou, Songbo ^{[1
]}

Isayev, Oleg ^{[1
]}

Yershov, Serhii ^{[1
]}

Zhang, Zhicheng ^{[2
]}

Wu, Kaiming ^{[1
,3
]}

机构：

[1] Wuhan Univ Sci & Technol, Int Res Inst Steel Technol, Collaborat Innovat Ctr Adv Steels, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China

[2] Daye Special Steel Co Ltd, Hubei Prov Key Lab High Performance Special Steel, Huangshi 435001, Peoples R China

[3] Met Valley & Band Foshan Met Composite Co Ltd, Foshan 528000, Peoples R China

来源：

MATERIALS LETTERS | 2022年 / 324卷

基金：

中国国家自然科学基金;

关键词：

Lamellar steels; Bainite; Isothermal heat treatment; Phase transformation; Microstructure; Impact toughness; MECHANICAL-PROPERTIES; SILICON STEELS; MICROSTRUCTURE;

D O I：

10.1016/j.matlet.2022.132517

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A novel heat treatment process below-Mf for medium carbon steel, with the relationship between the microstructure and mechanical properties was investigated. This study demonstrated that a bainitic ferrite/retained austenite lamellar steel with a tensile strength of 1436 MPa and a Charpy V-notch impact energy of more than 130 J was obtained by an isothermal heat treatment below-Mf. This result is considerably higher than that of above -Ms (21.3 J at 400 C) and below -Ms (46.0 J at 300 C). The isothermal heat treatment process below-Mf refines the bainitic ferrite laths, reduces the size and amount of blocky martensite/retained austenite, and makes the bainitic ferrite and retained austenite lamellae more uniform. The results demonstrate that the lamellar structure of bainitic ferrite laths and ductile carbon-rich retained austenite significantly improve the impact toughness of bainitic steels.

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页数：4

共 28 条

[21] Novel ultra-high-strength (ferrite plus austenite) duplex lightweight steels achieved by fine dislocation substructures (Taylor lattices), grain refinement, and partial recrystallization
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