Amelioration of weld-crack resistance of the M951 superalloy by engineering grain boundaries
Amelioration of weld-crack resistance of the M951 superalloy by engineering grain boundaries
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通过晶界工程改善 M951 高温合金的焊接裂纹抗力
DOI：
10.1016/j.jmst.2020.10.069
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发表时间：
2021-07
影响因子：
10.9
通讯作者：
Zhou YiZhou
中科院分区：
文献类型：
--
作者：
Wen Mingyue;Sun Yuan;Yu Jinjiang;Yang Shulin;Hou Xingyu;Yang Yanhong;Sun Xiaofeng;Zhou YiZhou
熔焊是一种便携式且经济的金属连接和修复方法。然而，镍基高温合金在熔焊过程中经常出现焊缝裂纹，阻碍了熔焊在此类材料上的应用。在这项工作中，研究了原型 M951 高温合金晶界 (GB) 的微观结构对其焊接性的影响。通过调节焊前热处理的冷却速率可以很大程度上改变析出相、晶界上的元素偏析以及晶界的形貌。随着冷却速度的降低，链状M23X6相沿着晶界析出，伴随着B的偏析，晶界的形貌变得更加锯齿状。在熔焊过程中，M951高温合金中的工程晶界具有低冷却速率，有利于晶界上形成连续液膜，这与锯齿状晶界形态一起显着防止焊接裂纹的形成。我们的研究结果表明，高温合金的抗焊接裂纹性能可以通过工程GB来改善。
Fusion weld is a portable and economical joining and repairing method of metals. However, weld cracks often occur during the fusion weld of Ni-base superalloys, which hinder the applications of fusion weld on this kind of materials. In this work, the effects of microstructures of grain boundaries (GBs) of the.prototype M951 superalloy on its weldability were investigated. The precipitated phases, the elemental segregations on GBs, and the morphologies of GBs can be largely altered by regulating the cooling rates of pre-weld heat treatments. With decreasing the cooling rate, chain-like M23X6 phase precipitates along the GBs, accompanying segregations of B, and GBs becomes more serrated in morphology. During fusion weld, the engineered GBs in the M951 superalloy with a low cooling rate favor the formation of the continuous liquid films on GBs, which together with the serrated GB morphology significantly prevents the formation of weld cracks. Our findings imply that the weld-crack resistance of the superalloys can be ameliorated by engineering GBs.
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