Influence of initial microstructures on intercritical annealing behaviour in a medium Mn steel

被引：18

作者：

Choi, Yong Hoon ^{[1
]}

Ryu, Joo Hyun ^{[2
]}

Lee, Sea Woong ^{[2
]}

Lee, Kyooyoung ^{[2
]}

Lee, Byeong Joo ^{[3
]}

Kim, Jin-Kyung ^{[1
]}

Lee, Jae Sang ^{[1
]}

Suh, Dong-Woo ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang, South Korea

[2] POSCO, Tech Res Labs, Gwangyang, South Korea

[3] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang, South Korea

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2019年 / 35卷 / 17期

基金：

新加坡国家研究基金会;

关键词：

Medium Mn TRIP steels; austenite; reverse transformation; annealing; martensite; diffusion; TRANSFORMATION-INDUCED PLASTICITY; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; TRIP STEELS; MARTENSITE; AUSTENITE; CARBON;

D O I：

10.1080/02670836.2018.1475445

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present work reports the effect of different initial microstructures on reverse transformation kinetics and morphologies of austenite formed during intercritical annealing in Fe-0.14C-7Mn-1Si (wt-%) medium Mn steel. Three different initial microstructures were produced by cold-rolling and cold-rolling followed by austenitisation at 820?C and 900?C. The specimen austenitised at higher temperature shows lath-type austenite after intercritical annealing. The difference in austenitisation temperature leads to different Mn distribution in martensitic initial microstructures, thereby leading to a difference in morphology of austenite. The inhomogeneous Mn profiles in initial microstructures also affect reverse transformation kinetics of austenite upon intercritical annealing. The presence of Mn-enriched regions accelerates austenite growth at an early stage of intercritical annealing but retards the transformation kinetics afterwards. This paper is part of a Thematic Issue on Medium Manganese Steels.

引用

页码：2092 / 2100

页数：9

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