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Residual stress driven cracking in superalloy weldments

机译：超合金焊接中的残余应力驱动裂缝

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摘要

Superalloy weldments are normally given post weld heat treatments to homogenize the weld metal microstructure, relieve residual stress, and precipitate strengthening phases. The relationship between microstructure and post weld heat treatment is easily studied; it is less straightforward to study the effects of post weld heat treatment on residual stress relaxation. Using a self-restrained testing procedure, a relatively simple approach was used to investigate the effects of microstructure and post-weld heat treatment on cracking during residual stress relaxation. Candidate superalloys for Advanced Ultra Supercritical steam plants were studied. It was found that cracking due to residual stress relaxation is primarily dependent on grain size, and in cases of intermediate grain size, intragranular precipitation is a controlling factor. These results are in agreement with traditional stress relaxation cracking theories.
机译：通常给予焊接焊接热处理的超合金焊接，以使焊接金属微观结构均匀化，缓解残留应力，并沉淀强化相。 易于研究微观结构与后焊接热处理之间的关系; 研究后焊接热处理对残余应力松弛的影响不太直接。 使用自限制的测试程序，采用相对简单的方法来研究微观结构和焊接后热处理对残余应力松弛期间裂缝的影响。 研究了先进超超临界蒸汽厂的候选超合金。 发现由于残余应力松弛引起的裂缝主要取决于晶粒尺寸，并且在中间粒度的情况下，腔内沉淀是控制因子。 这些结果与传统的压力松弛裂解理论一致。

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