叶存冬,孔德军

• 1:常州大学机械工程学院
• 2:江苏省材料表面科学与技术重点实验室
• 3:常州大学

摘要(Abstract)：

利用CO2激光器对X80管线钢焊接接头进行表面热处理,通过拉伸疲劳对比试验,用罗卡提法求出激光热处理前后X80管线钢焊接接头的疲劳极限。采用扫描电镜和金相显微镜分析激光热处理前后X80管线钢焊接接头的组织与断口形貌,通过X射线衍射仪分析了激光热处理前后X80管线钢焊接接头的残余应力及残留奥氏体,并对激光热处理提高抗疲劳断裂机理进行了探讨。结果表明,激光热处理在试样表面形成强化层,使X80管线钢焊接接头疲劳强度由542 MPa提高到604 MPa,提高了11.4%;原始状态下试样疲劳裂纹源起始于试样表面,经激光热处理后试样疲劳裂纹源转移至次表层;残留奥氏体增加、强化层晶粒细化和残余压应力场是提高疲劳强度的主要机制。

关键词(KeyWords)： 激光热处理;X80管线钢;焊接接头;疲劳性能;断口形貌

Abstract:

Keywords:

基金项目(Foundation): 江苏省科协首席专家( 工程师) 项目;; 中国学位与研究生教育学会研究课题(C1-2013Y07-051)

作者(Author): 叶存冬,孔德军

DOI: 10.13289/j.issn.1009-6264.2014.10.013

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