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Co-Al-W合金是一种由γ′-Co3(Al,W)相沉淀强化的新型钴基高温合金,为了研究含硼合金在不锈钢基体上TIG堆焊层的开裂行为,通过JMat Pro热力学模拟计算软件,对堆焊层Co-8.8Al-9.8W-0.2B合金不同部位析出相的类型、含量进行了模拟计算和实验验证。研究发现,堆焊层0.2B合金不同位置相组成相同,但含量不同。根据对堆焊层合金相组成和含量的分析,堆焊层表面出现的裂纹主要为热裂纹,裂纹的形成是热应力、相变应力以及Laves相综合作用的结果。
Co-Al-W alloy is a new type of cobalt-based superalloy strengthened by γ’-Co3 (Al, W) phase precipitation. In order to study the cracking behavior of boron-based alloy on TIG surfacing layer on stainless steel substrate, Simulation software was used to simulate and verify the type and content of precipitates in different parts of Co-8.8Al-9.8W-0.2B alloy. The study found that overlay 0.2B alloy phase composition of the same location, but the content is different. According to the composition and content of the overlay welding phase, the cracks on the surface of the overlay are mainly hot cracks, and the formation of cracks is the result of the combined effect of thermal stress, phase transformation stress and Laves phase.