岳重祥,陈焕德,白晓虹,刘东升

• 1:江苏省(沙钢)钢铁研究院

摘要(Abstract)：

使用Gleeble 3800热模拟实验机模拟不同热输入量(E)条件下F500厚钢板的单道次焊接热循环过程,通过光学显微镜(OM)、扫描电镜(SEM)及电子背散射衍射(EBSD)对钢板焊接热影响区(HAZ)显微组织随E的演化规律进行研究。测试了不同E下HAZ的室温硬度(HV10),在-60℃条件下进行Charpy示波冲击试验(CVN)。当热输入量E≤30 kJ/cm时,HAZ显微组织为细小而均匀的板条贝氏体(LB),板条间大角度晶界比例较大,HAZ具有较好的低温冲击韧性。随着E的增加,HAZ显微组织中出现大块的粒状贝氏体(GB),且GB的比例不断增加,大角度晶界比例降低,HAZ的韧性恶化。当热输入量E≤50 kJ/cm时,冲击断裂过程分为裂纹形成、稳定扩展、失稳扩展和最终断裂等各个阶段。当热输入量E≥100 kJ/cm,GB代替LB成为主要的组织形式,冲击断裂过程为脆性断裂,HAZ的韧性明显恶化。

关键词(KeyWords)： F500钢;模拟热影响区;精细组织;冲击断裂行为;低温韧性

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 岳重祥,陈焕德,白晓虹,刘东升

DOI: 10.13289/j.issn.1009-6264.2012.s2.023

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