摘要
按照BS 7448标准并结合显微分析方法,采用热模拟技术对t_(8/5)条件下X100级管线钢焊接热影响区粗晶区(CGHAZ)的断裂韧性(CTOD)进行了研究。结果表明,CTOD值随着t_(8/5)的增加而增加,显微组织由板条贝氏体向粒状贝氏体转化。当t_(8/5)=40 s时,原奥氏体晶界处出现的粗化链状M-A组元,使得断裂韧性出现下降;当t_(8/5)=50 s时,断裂韧性继续增加,但随着热输入的增大,晶粒有粗化的倾向。
According to BS 7448 standard and microscopic analysis method,thermal simulation technique was used to study the fracture toughness(CTOD)of the coarse grain zone in heat affected zone of X100 grade pipeline steel under different t_(8/5).The results showed that CTOD value increased as the t_(8/5)time increased,and microstructure was transformed from lath bainite to granular bainite.The coarse chain M-A component appeared at the grain boundary of the prior austenite at t_(8/5)=40 s,which caused a small decrease in fracture toughness.When t_(8/5)was 50 s,the fracture toughness continued to increase.However,the grains tended to coarsen as t_(8/5)increased.
作者
朱海山
徐连勇
曹健
贾鲁生
Zhu Haishan;Xu Lianyong;Cao Jian;Jia Lusheng(CNOOC Research Institute Ltd.,Beijing 100028,China;Tianjin University,Tianjin 300350,China;Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining,Harbin 150001,China)
出处
《焊接》
北大核心
2021年第3期5-12,61,共9页
Welding & Joining
基金
国家自然科学基金资助项目(51575382)。
关键词
X100管线钢
热模拟
粗晶区
断裂韧性
X100 pipeline steel
thermal simulation
coarse grain zone
fracture toughness
