摘要
对高Si和高Al的冷轧TRIP690钢进行400℃等温退火处理,并对等温后的微观组织分别进行SEM和TEM观察。结果显示,等温后高Al钢较高Si钢中的残余奥氏体含量更高,且拉伸形变后,相对于高Si钢,高Al钢拉伸断口附近有更多的残余奥氏体转变成了马氏体,提高了延伸率,TRIP效应更显著,这与高Al的TRIP钢等温处理后形成的大量块状亚稳态奥氏体有关。而高Si的TRIP钢等温后,组织中形成了少量的稳定性过高的条形奥氏体,拉伸过程中不易诱发马氏体相变,TRIP效应相对较弱。
TRIP690 steel with high Si and Al were isothermal treated at 400℃ and microstructures of the steels were observed by SEM and TEM.Results show that comparing to the steel with high Si,the content of residual austenite is higher and more austenite is transformed to martensite near the fractography,so the elongation is improved and TRIP effect is more significant for the steel with high Al.This is related to large amount of metastable massive austenite formed in TRIP steel with high Al after isothermal treating.For the high Si steel,a few stripe austenite with high stability is formed after isothermal treating,which can not transform to martensite during tensile process,so TRIP effect is relatively weak.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2012年第2期75-78,共4页
Journal of Plasticity Engineering
关键词
TRIP钢
残余奥氏体
马氏体
等温处理
TRIP steel
residual austenite
martensite
isothermal treating
