Effect of interlayer on the cracking susceptibility and mechanical properties of EBW joints of K465 superalloy

YUAN Hong; WANG Jinxue; ZHANG Guodong; YU Huai; GAO Jianshi

doi:10.7512/j.issn.1001-2303.2021.06.01

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Effect of interlayer on the cracking susceptibility and mechanical properties of EBW joints of K465 superalloy
Vol. 51, Issue 6, Pages: 1-6(2021)
DOI： 10.7512/j.issn.1001-2303.2021.06.01

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YUAN Hong, WANG Jinxue, ZHANG Guodong, et al. Effect of interlayer on the cracking susceptibility and mechanical properties of EBW joints of K465 superalloy. [J]. 51(6):1-6(2021)
DOI：

YUAN Hong, WANG Jinxue, ZHANG Guodong, et al. Effect of interlayer on the cracking susceptibility and mechanical properties of EBW joints of K465 superalloy. [J]. 51(6):1-6(2021) DOI： 10.7512/j.issn.1001-2303.2021.06.01.

摘要

通过调节焊接热输入和添加中间层合金等方法研究高Al、Ti含量的K465铸造高温合金的电子束焊接裂纹敏感性。结果表明,减小焊接热输入和添加低Al、Ti含量的中间层能够改善合金的热裂纹倾向;焊缝及热影响区沿晶界析出的碳化物等低熔点液体薄膜受应力作用是产生热裂纹的主要原因。含Fe的中间层重新合金化焊缝金属,改善了焊缝组织的塑性、韧性,破坏了碳化物等低熔点相的连续性,避免焊缝凝固裂纹的产生;接头具有优异的室温及高温拉伸性能,但高温持久性能不足。

Abstract

By adjusting the heat input and adding interlayer alloy,the EBW cracking susceptibility of K465 cast superalloy with high content of Al+Ti is investigated. The results show that the hot crack tendency of superalloy can be improved by reducing the heat input and adding the interlayer with low content of Al+Ti. The main reason of hot crack is that the welds and low melting point liquid film such as carbide precipitated along the grain boundary in HAZ are subjected to stress. Realloying of weld metal by Fe-containing interlayer improves the plasticity and toughness of weld microstructure,destroys the continuity of low melting point phase such as carbide and eliminates the solidification crack in weld. And the EBW joints have excellent tensile property at room temperature and high temperature,but the high temperature endurance property is insufficient.