高锰钢高速压缩时γ→ε-M和ε-M→α′-M的相变特征  

Transformation characteristics ofγ→ε-M andε-M→α′-M in high manganese steel under high speed compression

作　　者：王丽娜 李志超 武晓龙 马丹丹 杨平[3] WANG Li-na;LI Zhi-chao;WU Xiao-long;MA Dan-dan;YANG Ping(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]北京科技大学钢铁共性技术协同创新中心,北京100083 [3]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2021年第9期101-108,共8页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51771024)。

摘　　要：利用XRD技术对静态压缩和高速压缩高锰相变诱发塑性(TRIP)钢中γ(奥氏体)、ε-M(六方马氏体)和α′-M(体心马氏体)的体积分数进行计算,以确定应变速率对γ→ε-M和ε-M→α′-M相变动力学特征的影响。利用EBSD技术和相变晶体学计算对高速压缩样品中的γ→ε-M和ε-M→α′-M相变取向依赖性进行分析。结果表明:应变速率对γ→ε-M和ε-M→α′-M相变具有不同的影响。与静态压缩相比,高速压缩使得γ→ε-M相变被抑制、ε-M→α′-M相变被促进,这是由于两阶段相变分别受层错能和应力的影响较大。高应变速率使得变形初期的马氏体相变速率显著提高。高速压缩变形样品仍具有马氏体相变取向依赖性,这取决于不同取向γ晶粒内相变机械功的大小。γ→ε-M相变难易与ε-M的相变机械功有关;ε-M→α′-M相变难易则同时取决于ε-M和α′-M的相变机械功。The volume fractions ofγ(austenite),ε-M(hcp martensite)andα′-M(bcc martensite)in static and high speed compressed high manganese transformation induced plasticity(TRIP)steel were calculated by the XRD technique to investigate the effect of strain rate on the kinetic characteristics ofγ→ε-M andε-M→α′-M transformation.Orientation dependence ofγ→ε-M andε-M→α′-M transformation in high speed compressed specimen was analyzed by the EBSD technique and the calculation of martensitic transformation crystallography.The results show that the effects of strain rate onγ→ε-M andε-M→α′-M transformation are different.Compared to static compression,theγ→ε-M transformation is inhibited due to the higher stacking fault energy,andε-M→α′-M transformation is promoted because higher stress during high speed compression.Compared to static compressed specimen,martensitic transformation is accelerated at the early stage of high speed compression.High speed compressed specimen shows orientation dependence of martensitic transformation,which is related to the mechanical work of martensitic transformation in differently orientatedγgrains.γ→ε-M phase transformation is only related to the mechanical work ofε-M;ε-M→α′-M phase transformation depends on the mechanical work of bothε-M andα′-M.

关 键 词：高锰TRIP钢 应变速率 马氏体 取向依赖性 EBSD 

分 类 号：TG142.33[一般工业技术—材料科学与工程]