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Fatigue Crack Growth Behavior of the MIG Welded Joint of 06Cr19Ni10 Stainless Steel

机译：06Cr19Ni10不锈钢MIG焊接接头的疲劳裂纹扩展行为

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摘要

In this paper, the fatigue crack growth behavior of the base metal (BM), the weld metal (WM) and the heat-affected zone (HAZ) in the metal-inert gas (MIG) welded joints of the 06Cr19Ni10 stainless steel are analyzed and studied. Results of the fatigue crack propagation tests show that a new fatigue crack initiates at the crack tip of a pre-existing crack, then propagates perpendicular to the direction of cyclic fatigue loads. This observation indicates that the original mixed-mode crack transforms into the mode I crack. The WM specimen has the largest fatigue crack growth rate, followed by the HAZ specimen and the BM specimen. To illustrate the differences in fatigue crack growth behavior of the three different types of specimens, metallographic structure, fracture morphology and residual stresses of the BM, HAZ and WM are investigated and discussed. The metallographic observations indicate that the mean grain size of the HAZ is relatively larger than that of the BM. The fractographic analysis shows that the WM has the largest fatigue striation width, followed by the HAZ and the BM. It is also found that the depth of dimple in the WM is relatively shallower than the one in the HAZ and BM, implying the poor plasticity behavior of the material. Analysis results of the residual stress analysis demonstrate a high level of tensile residual stress appearance in the WM and HAZ.
机译：本文分析了06Cr19Ni10不锈钢的金属惰性气体（MIG）焊接接头中的母材（BM），焊缝金属（WM）和热影响区（HAZ）的疲劳裂纹扩展行为并研究了。疲劳裂纹扩展测试的结果表明，一个新的疲劳裂纹在一个已经存在的裂纹的裂纹尖端开始，然后垂直于周期性疲劳载荷的方向扩展。该观察结果表明原始的混合模式裂纹转变为I型裂纹。 WM试样具有最大的疲劳裂纹扩展速率，其次是HAZ试样和BM试样。为了说明三种不同类型试样在疲劳裂纹扩展行为上的差异，对BM，HAZ和WM的金相组织，断裂形态和残余应力进行了研究和讨论。金相观察表明，热影响区的平均晶粒尺寸相对大于金属相。形貌分析表明，WM具有最大的疲劳条纹宽度，其次是HAZ和BM。还发现，WM中的凹痕深度比HAZ和BM中的凹痕相对浅，这表明该材料的可塑性差。残余应力分析的分析结果表明，在WM和HAZ中出现了大量的拉伸残余应力。

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