High Ductility and Toughness of a Micro-duplex Medium-Mn Steel in a Large Temperature Range from-196 °C to 200 °C

被引：24

作者：

Chen, Si-lian ^{[1
]}

Hu, Jun ^{[1
,2
]}

Zhang, Xiao-dan ^{[3
]}

Dong, Han ^{[1
]}

Cao, Wen-quan ^{[1
]}

机构：

[1] Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China

[3] Tech Univ Denmark, Dept Wind Energy, Sect Mat Sci & Adv Characterizat, Danish Chinese Ctr Nanomet, DK-4000 Roskilde, Denmark

来源：

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL | 2015年 / 22卷 / 12期

基金：

中国国家自然科学基金; 新加坡国家研究基金会;

关键词：

high strength; high ductility; intercritical annealing; medium-Mn steel; ultrafine grain size; MECHANICAL-PROPERTIES; 9NI STEEL; AUSTENITE; TRANSFORMATION;

D O I：

10.1016/S1006-706X(15)30122-9

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A medium-Mn steel (0.2C5Mn) was processed by intercritical annealing at different temperatures (625 degrees C and 650 degrees C). An ultrafine-grained micro-duplex structure consisting of alternating austenite and ferrite laths was developed by austenite reverse transformation (ART) during intercritical annealing after forging and hot rolling. Ultrahigh ductility with a total elongation higher than 30% was achieved in the temperature range from - 196 degrees C to 200 degrees C and high impact toughness no less than 200 J at - 40 degrees C was obtained. Based on the analysis of microstructure and mechanical properties, it was found that the enhanced ductility was determined by the phase transformation effect 'of austenite (TRIP effect), while the delayed ductile to brittle transition was controlled by austenite stability.

引用

页码：1126 / 1130

页数：5

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