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Fatigue and crack growth behavior of Inconel 718-AL6XN dissimilar welds

机译：Inconel 718-AL6XN异种焊缝的疲劳和裂纹扩展行为

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摘要

The fatigue and crack growth behavior of Inconel 718 and AL6XN alloys joined with an EFtNiFeCr-2 filler by the gas tungsten arc welding process was evaluated. A comparison between Wohler curves for the monolithic IN718 and AL6XN alloys and the IN718-AL6XN dissimilar welded joint were obtained. Although Vickers microhardness profiles revealed the presence of a soft region in the heat affected zone of the IN718 base material, the fatigue crack nucleated at the fusion zone near to the AL6XN and propagated across the weld bead. The welded joint and the AL6XN base material presented a similar high cycle fatigue behavior despite the presence of an unmixed zone at the AL6XN/weld metal interface. The results of the fatigue crack growth test indicated that the weld metal has the highest growing rate owing to the presence of brittle secondary phases such as Laves and NbC. The fatigue crack growth rates obtained from experimental data were compared with measurements of the distance between striations on the fracture surfaces, both were very close.
机译：评价了通过气体钨极电弧焊工艺与EFtNiFeCr-2填料结合的Inconel 718和AL6XN合金的疲劳和裂纹扩展行为。比较了整体IN718和AL6XN合金与IN718-AL6XN异种焊接接头的Wohler曲线。尽管维氏显微硬度曲线显示在IN718基础材料的热影响区中存在软区，但疲劳裂纹在靠近AL6XN的熔合区成核，并在焊缝上扩展。尽管在AL6XN /焊接金属界面处存在未混合区，但焊接接头和AL6XN基础材料仍具有类似的高周疲劳行为。疲劳裂纹扩展测试结果表明，由于存在脆性第二相（例如Laves和NbC），焊缝金属具有最高的生长速率。从实验数据获得的疲劳裂纹扩展速率与裂缝表面上条纹之间的距离的测量结果进行了比较，两者都很接近。

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