A new effect of retained austenite on ductility enhancement in high-strength quenching-partitioning-tempering martensitic steel

被引：167

作者：

Zhang, Ke ^{[1
]}

Zhang, Meihan ^{[1
]}

Guo, Zhenghong ^{[1
]}

Chen, Nailu ^{[1
]}

Rong, Yonghua ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 29-30期

基金：

中国国家自然科学基金;

关键词：

Dislocation density; Ductility enhancement; Retained austenite absorbing dislocations; Q-P-T process; TRIP-ASSISTED STEELS; DISLOCATION DENSITY; HEAT-TREATMENT; X-RAY; CARBON; TRANSFORMATION; BAINITE; STABILITY; ALLOYS;

D O I：

10.1016/j.msea.2011.07.049

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A high-strength martensitic steel treated by a quenching-partitioning-tempering process is presented to examine the effect of retained austenite on ductility enhancement in martensitic steels. Results from X-ray diffraction line profile analysis (XLPA) indicate that the average dislocation density in martensite during uniform deformation is lower than before deformation, which effectively intensifies the deformation ability. The average dislocation density in retained austenite rapidly increases with increased strain and exceeds that in martensite. Based on the XLPA results, a new effect of austenite on the ductility enhancement is proposed: the austenite phase can continuously absorb ample dislocations from neighbouring martensite laths. This effect is indirectly verified by transmission electron microscopy. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：8486 / 8491

页数：6

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