Effects of strain rate on austenite stability and mechanical properties in a 5Mn steel

• 作者: Yong-gang Yang Wang-zhong Mu Xiao-qing Li Hai-tao Jiang Mai Wang Zhen-Ii Mi Xin-ping Mao
• 来源期刊: 钢铁研究学报（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: ORIGINAL PAPERS
• 页码范围: 316-326
• 页数: 11页
• 语种: 英文

摘要

The austenite stability and the mechanical properties in a typical medium Mn grade steel,i.e.,5Mn steel,were investigated under a wide range of strain rates through the combination of experimental and theoretical methodologies.The obtained results indicate that austenite is more stable at a high strain rate,which is due to the suppression of the austenite to martensite transformation.This suppression is attributed to the increased stacking fault energy and the high deformation energy barrier.Moreover,the suppression of martensitic transformation also leads to the decrease in the ultimate tensile strength and the uniform elongation.Owing to the increase in an adiabatic heating temperature,an increase in the uniform elongation is acquired at a high strain rate.The obtained fundamental study results shed light on a wide application of the medium Mn steel under different strain rate conditions.