X80管线钢焊接热模拟热影响区疲劳裂纹扩展行为的分析及预测

doi:10.13251/j.issn.0254-6051.2020.12.036

金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 184-188.DOI: 10.13251/j.issn.0254-6051.2020.12.036

X80管线钢焊接热模拟热影响区疲劳裂纹扩展行为的分析及预测

徐鹏飞¹, 赵作鹏¹, 程红霞¹, 肖福仁²

1.河海大学海工装备与水下技术研究所, 江苏南京 210098;
2.燕山大学亚稳材料制备技术与科学国家重点实验室, 河北秦皇岛 066004

收稿日期:2020-07-29 出版日期:2020-12-25 发布日期:2021-01-14
通讯作者: 赵作鹏,讲师,博士,E-mail: zpzhao@hhu.edu.cn
作者简介:徐鹏飞(1982—),男,副教授,博士,主要研究方向为海洋装备研发、海洋机器人技术研究与应用,E-mail: xupengfei@hhu.edu.cn。
基金资助:
国家自然科学基金(51171162)

Analysis and forecast of fatigue crack propagation behavior in HAZ of X80 pipeline steel by welding thermal simulation

Xu Pengfei¹, Zhao Zuopeng¹, Cheng Hongxia¹, Xiao Furen²

1. Institute of Marine Engineering Equipment and Underwater Technology, Hohai University, Nanjing Jiangsu 210098, China;
2. Key Lab of Metastable Materials Science and Technology and College of Materials Science and Engineering, Yanshan University, Qinhuangdao Hebei 066004, China

Received:2020-07-29 Online:2020-12-25 Published:2021-01-14

摘要/Abstract

摘要： 通过焊接热模拟方法对X80双相管线钢不同焊接热影响区疲劳裂纹扩展行为进行了研究,并分析实际焊接试样与焊接热模拟试样的热影响区疲劳裂纹扩展行为的差异,讨论了焊接热模拟技术应用于疲劳裂纹扩展寿命预测的可行性。结果表明,当裂纹在粗晶热影响区(CGHAZ)和临界热影响区(ICHAZ)上扩展时,由实际焊接试样与焊接热模拟试样热影响区所测得的疲劳裂纹扩展速率曲线(da/dN-DK曲线)存在明显差异,其原因与显微组织变化引起的裂纹扩展阻力大小不同有关。因此,建议采用实际焊接试样完整的热影响区所测得的da/dN-DK曲线来评估疲劳裂纹扩展寿命。

关键词: 焊接热模拟, 热影响区, 疲劳裂纹扩展, X80管线钢

Abstract: Fatigue crack propagation behavior in each heat affected zone (HAZ) of X80 dual-phase pipeline steels was investigated by using welding thermal simulation. The differences of the fatigue cracks propagation behavior between real welded and welding thermal specimens were also analyzed. And the feasibility on the prediction of fatigue cracks propagation life for applying welding thermal simulation was discussed. The results show that there is an obvious contrast between the fatigue crack growth rate curves (da/dN-DK curves) of the real welded and welding thermal specimens when the cracks are propagated in the CGHAZ and ICHAZ, which are attributed to variations of the microstructure change, thus leading to the change of cracks propagation resistance. Therefore, it is recommended to predict the fatigue crack propagation life through the da/dN-DK curve of integrated HAZ in the real welded specimens.

Key words: welding thermal simulation, heat affected zone, fatigue crack propagation, X80 pipeline steel

中图分类号:

TG441

徐鹏飞, 赵作鹏, 程红霞, 肖福仁. X80管线钢焊接热模拟热影响区疲劳裂纹扩展行为的分析及预测[J]. 金属热处理, 2020, 45(12): 184-188.

Xu Pengfei, Zhao Zuopeng, Cheng Hongxia, Xiao Furen. Analysis and forecast of fatigue crack propagation behavior in HAZ of X80 pipeline steel by welding thermal simulation[J]. Heat Treatment of Metals, 2020, 45(12): 184-188.

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X80管线钢焊接热模拟热影响区疲劳裂纹扩展行为的分析及预测

Analysis and forecast of fatigue crack propagation behavior in HAZ of X80 pipeline steel by welding thermal simulation

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