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Intergranular cracking of Hastelloy C-276 in the socket welded assemblies

机译：哈氏合金C-276在承插焊组件中的晶界裂纹

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摘要

The cause of thermal cracking about a socket welded tube was investigated by stress simulation and its comparison to hardness distribution of welding seam, HAZ and matrix of the tube. In the condition of heat-input in melting range of 1349 deg C, the stress was concentrated in HAZ at the opposite side of welding area by ANSYS program, which corresponded to the distribution of real hardness values of the tube. The high stress concentration in HAZ might be induced from fine carbide precipitation which formed during welding process. It could cause, therefore, tube cracking in operating condition simultaneously followed by bulging inside of the welded tube. In the crack propagation through all the tube originated from inside HAZ, it might be accelerated by thermal fatigue, and propagated along grain boundaries accompanied by the metal dust formation.
机译：通过应力模拟研究了承插焊管热裂纹的原因，并将其与焊缝，HAZ和管基体的硬度分布进行了比较。在熔化温度为1349℃的情况下输入热量的情况下，应力通过ANSYS程序集中在焊接区域相对侧的HAZ中，这对应于管的实际硬度值的分布。 HAZ中的高应力集中可能是由焊接过程中形成的细小的碳化物沉淀引起的。因此，这可能会导致在工作条件下管子破裂，同时使焊接管子内部鼓胀。在裂纹的扩展中，所有裂纹均起源于热影响区，可能是由于热疲劳而加速，并沿着晶界扩展，并伴随着金属粉尘的形成。

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