低硅含铝TRIP钢残余奥氏体变形过程中稳定性研究  

Stability of Retained Austenite of Low Si Containing Al TRIP Steel During Deformation

作　　者：定巍[1] 龚志华[1] 唐荻[2] 江海涛[2] 王宝峰[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [2]北京科技大学高效轧制国家工程研究中心,北京100083

出　　处：《材料工程》2013年第12期68-73,共6页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(50804005);内蒙古科技大学产学研培育基金资助项目(PY-201201)

摘　　要：采用预拉伸实验对低硅含铝TRIP钢变形过程中残余奥氏体的演变规律进行研究,建立残余奥氏体变形过程中稳定性与加工硬化指数n之间的对应关系,在此基础上通过设计不同热处理工艺,获得具有不同初始残余奥氏体特性的TRIP钢以及具有不同组织构成的TRIP钢,并分析了TRIP钢的残余奥氏体稳定性。结果表明:TRIP钢中的残余奥氏体随着变形的深入,稳定性逐渐增加;残余奥氏体越稳定,TRIP钢的瞬时加工硬化值越稳定(n值越稳定);随着初始碳含量的增加,残余奥氏体在变形过程中的稳定性也随之提高。在变形过程中,残余奥氏体的稳定性受残余奥氏体碳含量,分布以及周围相等因素的共同影响。Retained austenite（RA） evolution during deformation of low Si TRIP steel was studied by pre-tension test, and relationship of stability of retained austenite during deformation with work hard- ening exponent n was established. Different heat treatment processes were designed in order to acquire TRIP steel with different incipient retained austenite or different microstructures, and then stability of retained austenite of the TRIP steel was analyzed. The results show that, as the progressing deforma- tion the stability of retained austenite increases, the work hardening performance gets better and the stability of retaining austenite during deformation also increases with the increasing of initial carbon content. The stability of retaining austenite is influenced by the carbon content and distribution of re- tained austenite as well as surrounding phases.

关 键 词：TRIP钢 残余奥氏体 加工硬化指数 微观组织 

分 类 号：TG142[一般工业技术—材料科学与工程]