Microstructural response to heat affected zone cracking of prewelding heat-treated Inconel 939 superalloy
作者： M.A. González , D.I. Martínez , A. Pérez , H. Guajardo , A. Garza
DOI: 10.1016/J.MATCHAR.2011.09.006
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摘要: Abstract The microstructural response to cracking in the heat-affected zone (HAZ) of a nickel-based IN 939 superalloy after prewelding heat treatments (PWHT) was investigated. PWHT specimens showed two different microstructures: 1) spherical ordered γ′ precipitates (357–442 nm), with blocky MC and discreet M23C6 carbides dispersed within coarse dendrites interdendritic regions; 2) “ogdoadically” diced cube shapes regions. After being tungsten inert gas welded (TIG) applying low input, welding speed using more ductile filler alloy, microstructures consisting precipitate particles along grain boundaries, displayed considerably improved weldability due strong reduction intergranular HAZ associated liquation microfissuring phenomena.
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