Grain boundary melting and hot cracking in weld HAZ of a two-phase Ni{sub 3}Al alloy containing Zr
- Associated Western Universities, Richland, WA (United States)
- State Univ. of New York, Buffalo, NY (United States). Dept. of Mechanical and Aerospace Engineering
Grain boundary melting and its effect on hot cracking in the weld heat-affected zone (HAZ) have been investigated in the investment cast billet of a two-phase ({gamma} + {gamma}{prime}) nickel aluminide alloy (Ni{sub 74.48}Al{sub 16.98}Cr{sub 8.02}Zr{sub 0.51}B{sub 0.10}), designated as IC-218. Due to enrichment of Zr, which can form eutectic alloys with Ni, the dendritic boundaries melted incipiently at 1,150 C. Under thermal stresses during welding the molten layers often opened up producing liquation cracks at the boundaries in the HAZ. Annealing at 1,100 C in argon for 23 h prior to welding reduced the incipient melting temperature to 1,125 C and increased the propensity of liquation cracking in the HAZ.
- OSTI ID:
- 78349
- Report Number(s):
- CONF-941144--; ISBN 1-55899-265-0
- Country of Publication:
- United States
- Language:
- English
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