改进型T23钢的再热裂纹敏感性  

Reheat cracking susceptibility of modified T23 steel

作　　者：周任远[1] 朱丽慧[1] 李世贤 翟国丽[2] 宋明[3] Zhou Renyuan;Zhu Lihui;Li Shixian;Zhai Guoli;Song Ming(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Central Research Institute,Baoshan Iron and Steel Co.,Ltd.,Shanghai 201900,China;China Special Equipment Inspection and Research Institute,Beijing 100029,China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]宝山钢铁股份有限公司中央研究院,上海201900 [3]中国特种设备检测研究院,北京100029

出　　处：《金属热处理》2020年第1期20-25,共6页Heat Treatment of Metals

基　　金：国家重点研发计划(2016YFC0801901)

摘　　要：利用光学显微镜(OM)、扫描电镜(SEM)和透射电镜(TEM)研究了T23钢及4组改进型T23钢CGHAZ的微观组织,采用Gleeble热模拟及高温缓慢拉伸的方法评判T23钢和4组改进型T23钢焊接热影响区粗晶区(CGHAZ)的再热裂纹敏感性。探讨了再热裂纹敏感性的影响因素,分析了改进型T23钢再热裂纹敏感性改善的原因。结果表明,晶粒尺寸、晶界和晶内析出相以及晶内固溶元素均对再热裂纹敏感性有较大的影响。与T23钢相比,成分改进后的T23钢CGHAZ的微观组织得到了优化,晶界晶内强度差减小,再热裂纹敏感性得到改善。Microstructure of CGHAZ in T23 and four groups of modified T23 steel was investigated by means of optical microscope( OM),scanning electron microscope( SEM) and transmission electron microscope( TEM). Gleeble was used to produce the simulated coarsegrained heat-affected zone( CGHAZ) in T23 and four groups of modified T23 steel via thermal simulation of welding,and it was also used to evaluate the reheat cracking susceptibility by isothermal slow strain rate tensile test. The factors that influencing reheat cracking susceptibility were discussed,and the reasons for decreased reheat cracking susceptibility of modified T23 steel were analyzed. The results show that the grain size,intergranular precipitates,intragranular precipitates and solid solution elements have a significant influence on the reheat cracking susceptibility. Compared with T23 steel,the microstructure of modified T23 steel is optimized,leading to the decreased difference between intergranular strength and intragranular strength. Therefore,the reheat cracking susceptibility of modified T23 steel is improved.

关 键 词：改进型T23钢 再热裂纹敏感性 Gleeble热模拟 热影响区粗晶区 析出相 

分 类 号：TG142.1[一般工业技术—材料科学与工程]