Journal ArticleDOI
Effect of filler alloy composition on post-weld heat treatment cracking in GTA welded cast Inconel 738LC superalloy
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In this article, the effect of filler alloy composition on post-weld heat treatment (PWHT) cracking in Inconel 738LC (IN-738LC) superalloy was investigated.Abstract:
The effect of filler alloy composition on post-weld heat treatment (PWHT) cracking in Inconel (trade name of the Special Metals group of companies) 738LC (IN-738LC) superalloy was investigated. Five filler alloys (IN-625, IN-718, FM-92, C-263 and Rene-41), containing varying concentrations of Al and Ti, were used to gas tungsten arc (GTA) weld IN-738LC superalloy specimens which were given two different preweld heat treatments. Additionally, autogenous (without filler) welds were also made on the same two preweld heat treated materials. The preweld heat treatments consisted of the standard industrial solution heat treatment (SHT) at 1120°C for 2 h in vacuum followed by argon quenching and a new heat treatment (UMT), developed by the authors to improve the heat affected zone (HAZ) cracking resistance of IN-738LC. The latter heat treatment comprised of solution treatment at 1120°C for 2 h followed by aging at 1025°C for 16 h and then water quenching. The welded specimens were given a PWHT consisting...read more
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References
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Journal ArticleDOI
Contribution of constitutional liquation of gamma prime precipitate to weld HAZ cracking of cast Inconel 738 superalloy
TL;DR: The weld heat affected zone (HAZ) cracking in cast Inconel 738 superalloy has been examined in this article, where the main strengthening phase of the alloy c 0, which is also present in significant volume after pre-weld heat treatment, was found to contribute significantly to grain boundary liquation and its attendant cracking in the HAZ.
Journal ArticleDOI
Microstructural study of weld fusion zone of TIG welded IN 738LC nickel-based superalloy
TL;DR: In this article, the weld fusion zone microstructure of a commercial aerospace superalloy IN 738 was examined and the elemental segregation induced interdendritic microconstituents were identified to include terminal solidification product M3B2 and Ni7Zr2 in association with γ-γ′ eutectic constituent.
Journal ArticleDOI
Influence of various heat treatments on the microstructure of polycrystalline IN738LC
TL;DR: In this paper, the microstructural development of IN738LC during various heat treatments was studied, and two different growth processes were observed: merging of smaller precipitates to produce larger ones and growth through solute absorption from the matrix.
Journal ArticleDOI
Effect of filler alloys on heat-affected zone cracking in preweld heat-treated IN-738 LC gas-tungsten-arc welds
TL;DR: In this paper, the effect of filler alloys C-263, RENE-41, IN-718, and FM-92 on heat-affected zone (HAZ) cracking susceptibility of cast IN-738 LC, which is a high-temperature Ni-based superalloy used at temperatures up to 980 °C and is precipitation hardened by the Ni3Al,Ti) phase, by gas-tungsten-arc (GTA) welding was studied.
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