摘要
采用Gleeble-3800热模拟试验机研究了690MPa低裂纹敏感性贝氏体海工钢不同热输入焊接热影响区粗晶区(coarse grain high affected zone,CGHAZ)组织及低温韧性。结果表明:随着热输入的增加,试验钢CGHAZ中组织类型由马氏体/贝氏体向贝氏体/粒状贝氏体转变,M/A数量增多尺寸变大,低温韧性先升高后降低,当热输入30KJ/cm时韧性最好;当焊接热输入50KJ/cm时,M/A组元变粗大,粒状贝氏体出现以及原奥氏体晶粒度变大,大角度晶界密度下降,从而导致低温韧性恶化。
The microstructure and low temperature toughness of coarse grain high affected zone(CGHAZ)with different heat input of 690MPa low-crack sensitive bainite marine steel were studied by Gleeble3800 thermal simulation tester.The results show that with the increase of heat input,the microstructure of CGHAZ changes from martensite/bainite to bainite/granular bainite,the number of M/A increases,the size becomes larger,the low temperature toughness rises before the 30KJ/cm heat input and then falls.When the heat input up to 50 KJ/cm,the M/A component and the grain size of the austenite coarsens,the granular bainite appears and the grain boundary density decreases at large angle,which leads to the deterioration of low temperature toughness.
作者
孙宪进
诸建阳
许峰
Sun XianJin;Zhu Jianyang;Xu Feng(Jiangyin Xincheng Special Steel Co.,Ltd,Jiangyin,Jiangsu 214429)
出处
《特钢技术》
CAS
2021年第1期17-20,共4页
Special Steel Technology
关键词
热输入
海工钢
热影响区粗晶区
低温韧性
heat input
offshore steel
quenching and tempering
coarse grain high affected zone
low tempera-ture toughness