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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t8/5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t8/5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t8/5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。
Abstract：Based on the temperature history curves of the heat affected zone(HAZ) recorded during the welding of EH690 high-strength steel welded joints, the Gleeble-3500 thermal simulation test machine was used to simulate and reproduce the corresponding welding thermal cycle, and microstructure samples of the coarse-grain heat affected zone(CGHAZ) at the weld toe were prepared. The peak temperature was set to 1350 ℃, and the cooling time t8/5 was set to 10 s, 20 s and 30 s. The microstructure of the samples with different cooling time was observed using an optical microscope and scanning electron microscopy, and the fatigue performance of the microstructure in the CGHAZ of EH690 high-strength steel welded joints was tested using fatigue tests. The results show that the microstructure of the coarse-grain zone obtained by welding thermal simulation is consistent with that of the coarse-grain zone at the weld toe of the EH690 high-strength steel, exhibiting a typical lath martensite structure. With the increase of cooling time, the lath martensite content decreases, austenite transforms into bainite, and both strength and hardness decrease. The fatigue performance of CGHAZ microstructure specimens with cooling time t8/5 of 10 s and 30 s is superior to that of the base metal. However, for the CGHAZ microstructure sample with a cooling time t8/5 of 20 s, the formation of upper bainite structure leads to reduced fatigue performance and a lower fatigue life compared to the base metal. Both American and European standards can conservatively evaluate the fatigue performance of the EH690 high-strength steel and its CGHAZ microstructure.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0539
中图分类号:TG407
引用信息:
[1]刘培灿,陈成,邵永波,等.EH690高强钢焊接接头热影响区粗晶区微观组织的疲劳性能[J].材料热处理学报,2025,46(10):200-212.DOI:10.13289/j.issn.1009-6264.2024-0539.
基金信息:
国家自然科学基金(52208211,52401343)