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Grain Boundary Melting and Hot Cracking in Weld Haz of A Two-Phase Ni3Al Alloy Containing Zr

Published online by Cambridge University Press:  22 February 2011

Huaxin Li  and
T.K. Chaki
Huaxin Li
Affiliation:
Associated Western Universities, N.W. Division, C/O. Battelle PNL, Mail Stop P8-15, Richland, WA 99352
T.K. Chaki
Affiliation:
State University of New York, Department of Mechanical and Aerospace Engineering, Buffalo, NY 14260
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Abstract

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 (γ + γ′) nickel aluminide alloy (Ni74.48Al16.98Cr8.02Zr0.51B0.10), designated as IC-218. Due to enrichment of Zr, which can form eutectic alloys with Ni, the dendritic boundaries melted incipiently at 1150°C. Under thermal stresses during welding the molten layers often opened up producing liquation cracks at the boundaries in the HAZ. Annealing at 1100°C in argon for 23 h prior to welding reduced the incipient melting temperature to 1125°C and increased the propensity of liquation cracking in the HAZ.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 375
Copyright
Copyright © Materials Research Society 1995

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