On the Factors Influencing the High Stretch-Flangeability of a Low-Density 1180 MPa Fe-Mn-Al-C-Nb δ-QP Steel

扫码查看

原文链接

万方数据

外文摘要：Low-density δ-quenching and partitioning(δ-QP)steels with excellent strength and ductility have been recently developed.However,there are still rare reports on the formability of δ-QP steels,which are critical for satisfying the manufacture of structural parts during the application in automotive industry.In the present work,an 1180 MPa Fe-Mn-Al-C-Nb δ-QP steel with a high ductility was adopted for the stretch-flangeability study.The δ-QP steel was developed by separated quenching and partitioning processes.A good hole expansion ratio(HER)of 34.9±0.9％ was obtained in the quenched steel,but it has been further increased to 52.2％ by the tempering treatment.The improved stretch-flangeability was attributed to the enhanced austenite stability and deformation uniformity.On the one hand,the stability of austenite was increased by carbon partitioning during tempering,which reduced crack possibility via the suppression of the fresh martensite formation.On the other hand,the tempering treatment released the internal stress caused by martensitic transformation and reduced the difference in strength among different phases,resulting in an increase in the resistance to crack initiation and propagation.

外文关键词：

Hole expansion ratioLow-density δ-quenching and partitioning(δ-QP)steelStretch-flangeabilityAustenite stabilityDeformation uniformity

作者：

Dan-Dan Cui、Peng Chen、Peng-Fei Wang、Xiao-Wu Li

展开 >

作者单位：

Department of Materials Physics and Chemistry,School of Materials Science and Engineering,and Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China

State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversityFundamental Research Funds for the Central University

项目编号：

5217110851804072N2202007N2202011

出版年：

2024

DOI：

10.1007/s40195-024-01688-y

金属学报(英文版)

中国金属学会

金属学报(英文版)

CSTPCD

影响因子：0.77

ISSN：1006-7191

年,卷(期)：2024.37(8)