Tracking Heat-affected Zone
Cracking Susceptibility In Standard And
Modified Heat Treated IN 738 Superalloy Welds
Author(s)
L. O. Osoba & M. O. H. Amuda
Abstract
The conditions influencing the phenomenon of heat affected zone (HAZ)
cracking during tungsten inert gas (TIG) welding of a gamma-prime (γ’)
precipitation strengthened nickel-base superalloy, IN 738, is discussed here. The
discussion is reinforced with the dependence of the cracking on particle size
variation of the γ’ precipitates and base alloy hardness. Microstructural analysis
of the magnitude of HAZ cracking in the alloy indicates that while resistance to
cracking susceptibility is poor in the standard heat treatment (SHT) condition,
the modified heat treated (MHT) alloy exhibits significantly improved resistance
to HAZ cracking. The improvement in resistance to HAZ cracking in the MHT
alloy is attributed to the lower hardness of the alloy which permits stress
relaxation in the base alloy compared to the SHT alloy. In contrast to what is
expected based on the recommended manufacturer SHT procedure, preweld
microstructural modification presents a viable way of limiting cracking
susceptibility in TIG welded IN 738 superalloy.
Keywords: joining, superalloy, HAZ cracking.
Keywords
joining, superalloy, HAZ cracking.
Related Book
Other papers in this volume
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