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王厚勤, 张秉刚, 王廷, 闻雅, 冯吉才. 60mm厚TC4钛合金电子束焊接头疲劳性能[J]. 焊接学报, 2015, 36(5): 13-16,103.
引用本文: 王厚勤, 张秉刚, 王廷, 闻雅, 冯吉才. 60mm厚TC4钛合金电子束焊接头疲劳性能[J]. 焊接学报, 2015, 36(5): 13-16,103.
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WANG Houqin, ZHANG Binggang, WANG Ting, WEN Ya, FENG Jicai. Fatigue property of TC4 joint with a thickness of 60 mm by electron beam welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(5): 13-16,103.
Citation: WANG Houqin, ZHANG Binggang, WANG Ting, WEN Ya, FENG Jicai. Fatigue property of TC4 joint with a thickness of 60 mm by electron beam welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2015, 36(5): 13-16,103.
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60mm厚TC4钛合金电子束焊接头疲劳性能

Fatigue property of TC4 joint with a thickness of 60 mm by electron beam welding

    摘要
  • 摘要: 针对大厚度钛合金在海洋领域的应用,开展了60 mm厚TC4钛合金电子束焊接(EBW)接头疲劳性能的研究. 对EBW接头和母材的疲劳性能进行测试,分析接头疲劳性能的均匀性,绘制S-N曲线对比分析母材与接头的疲劳性能,并采用扫描电镜观察疲劳试样断口以解明断裂路径. 结果表明,EBW接头疲劳性能测试断裂多发生在母材,少数断裂在热影响区,接头疲劳性能沿熔深方向由上至下逐步降低,电子束焊接接头比母材高出10%,接头疲劳试验断口可分为疲劳源区、裂纹稳定扩展区和瞬断区3个典型区域,裂纹起源于试件表面边缘处.

     

    Abstract: The fatigue property of TC4 alloy with a thickness of 60mm by electron beam welding was studied for the application in ocean engineering. The homogeneity of the fatigue property of the joint was analyzed and the S-N curve of both the joint and base metal were drawn to compare their fatigue property. Scanning electron microscope was used to investigate the path of fatigue induced crack. The result showed that most of the fatigue specimens fractureed at the base metal while several occurred at the heat affected zone. The fatigue property of the joint gradually reduced along the penetration direction. Fatigue property of the EBW joint was 10% better than that of the base metal. The fractured joint can be characterized by three regions: fatigue crack source zone, fatigue crack propagation zone and fatigue fractured zone. The crack initiated at the specimen surface.

     

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