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Welding of a Two-Phase Ni3Al Alloy

Published online by Cambridge University Press:  01 January 1992

Huaxin Li  and
T. K. Chaki
Huaxin Li
Affiliation:
State University of New York, Department of Mechanical and Aerospace Engineering, Buffalo, NY 14260
T. K. Chaki
Affiliation:
State University of New York, Department of Mechanical and Aerospace Engineering, Buffalo, NY 14260
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Abstract

Autogeneous gas tungsten arc welding was performed on plates (about 3 mm thick) cut from cast ingot of aNi3 Al alloy (Ni 73.80 Al 15.82 Cr 8.33Mo 1.68 Zr 0.52 B 0.05), known as IC-396M. The alloy was susceptible to cracking in the heat-affected zone (HAZ). The cracks in HAZ were liquation cracks and occurred along dendritic boundaries and around eutectic cells. The fusion zone (FZ) contained many fine eutectic cells (about 5-10 μm in diameter) and there were microcracks (1-5 μm in size) in the cells. Two types of eutectic structures were observed in the base metal, HAZ and FZ of IC-396M. One had web-like structure and the other had lamellar structure, the later having high enrichment with Zr. The role of Zr enrichment in dendritic boundaries and eutectic cells in causing liquation cracks will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1167
Copyright
Copyright © Materials Research Society 1995

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References

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