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Liquation cracking in the heat-affected zone of IN939 superalloy tungsten inert gas weldments
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-06-10 , DOI: 10.1007/s12613-019-1954-y
Hassan Kazempour-Liasi , Mohammad Tajally , Hassan Abdollah-Pour

The main aim of this study was to investigate liquation cracking in the heat-affected zone (HAZ) of the IN939 superalloy upon tungsten inert gas welding. A solid solution and age-hardenable filler metals were further studied. On the pre-weld heat-treated samples, upon solving the secondary γ′ particles in the matrix, primary γ′ particles in the base metal grew to “ogdoadically diced cubes” of about 2 µm in side lengths. The pre-weld heat treatment reduced the hardness of the base metal to about HV 310. Microstructural studies using optical and field-emission scanning electron microscopy revealed that the IN939 alloy was susceptible to liquation cracking in the HAZ. The constitutional melting of the secondary, eutectic, and Zr-rich phases promoted the liquation cracking in the HAZ. The microstructure of the weld fusion zones showed the presence of fine spheroidal γ′ particles with sizes of about 0.2 µm after the post-weld heat treatment, which increased the hardness of the weld pools to about HV 350 and 380 for the Hastelloy X and IN718 filler metals, respectively. Application of a suitable solid solution filler metal could partially reduce the liquation cracking in the HAZ of IN939 alloy.



中文翻译:

IN939高温钨极惰性气体保护焊件热影响区的液化裂纹

这项研究的主要目的是研究在惰性气体保护下IN939高温合金的热影响区(HAZ)的液化开裂。进一步研究了固溶体和可时效硬化的填充金属。在预焊接的热处理样品上,当基体中的次要γ'颗粒溶解后,贱金属中的次要γ'颗粒会长成边长约2 µm的“二氧化丁”。焊接前的热处理将母材的硬度降低到大约HV310。使用光学和场发射扫描电子显微镜的显微组织研究表明,IN939合金在热影响区中易发生液裂。次生相,共晶相和富Zr相的结构性熔化促进了热影响区的液化裂化。焊缝熔合区的显微组织表明,在焊后热处理后,存在约0.2 µm的细球形γ'颗粒,对于Hastelloy X和IN718,焊缝池的硬度增加到大约HV 350和380填充金属。适当固溶填充金属的应用可以部分减少IN939合金的热影响区中的液化裂纹。

更新日期:2020-06-10
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