Journal
MATERIALS CHARACTERIZATION
Volume 62, Issue 12, Pages 1116-1123Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2011.09.006
Keywords
Welding; Ni-based superalloy; Microstructure; SEM; Grain boundary; HAZ microfissuring
Categories
Funding
- CONACyT Mexico
- Paicyt
- Universidad Autonoma de Nuevo Leon
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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. The PWHT specimens showed two different microstructures: 1) spherical ordered gamma' precipitates (357-442 nm), with blocky MC and discreet M23C6 carbides dispersed within the coarse dendrites and in the interdendritic regions; and 2) ordered gamma' precipitates in ogdoadically diced cube shapes and coarse MC carbides within the dendrites and in the interdendritic regions. After being tungsten inert gas welded (TIG) applying low heat input, welding speed and using a more ductile filler alloy, specimens with microstructures consisting of spherical gamma' precipitate particles and dispersed discreet MC carbides along the grain boundaries, displayed a considerably improved weldability due to a strong reduction of the intergranular HAZ cracking associated with the liquation microfissuring phenomena. (C) 2011 Elsevier Inc. All rights reserved.
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