刘培灿,陈成,邵永波,高旭东,彭宽,邓韬

• 1:西南石油大学土木工程与测绘学院
• 2:西南石油大学机电工程学院
• 3:成都工业学院智能制造学院
• 4:国家能源集团科学研究院

摘要(Abstract)：

基于EH690高强钢焊接接头焊接过程中记录的热影响区温度历史曲线，采用Gleeble-3500热模拟试验机模拟再现相应焊接热循环，制备焊趾处热影响区粗晶区(CGHAZ)微观组织试样。峰值温度设置为1350℃,冷却时间t_(8/5)设置为10、20和30 s。利用光学显微镜和扫描电镜观察不同冷却时间试样的微观组织，并采用疲劳试验测试EH690高强钢焊接接头热影响区粗晶区(CGHAZ)微观组织的疲劳性能。结果表明：焊接热模拟得到的粗晶区微观组织与EH690高强钢焊接接头焊趾处粗晶区的组织一致，为典型的板条状马氏体组织；随着冷却时间的增加，板条马氏体减少，奥氏体转变为贝氏体组织，强度和硬度值降低；冷却时间t_(8/5)为10和30 s的CGHAZ微观组织试样的疲劳性能优于母材；对于冷却时间t_(8/5)为20 s的CGHAZ微观组织试样，由于上贝氏体组织的产生，致使其疲劳性能降低，疲劳寿命低于母材试样。美国规范和欧洲规范均能较为保守地评估EH690高强钢及其CGHAZ微观组织的疲劳性能。

关键词(KeyWords)： EH690高强钢;焊接热模拟;热影响区;微观组织;疲劳性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52208211,52401343)

作者(Author): 刘培灿,陈成,邵永波,高旭东,彭宽,邓韬

DOI: 10.13289/j.issn.1009-6264.2024-0539

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