O. A. Ojo, N. L. Richards, M. C. Chaturvedi, University of Manitoba, Winnipeg, MB, Canada

Summary: Heat affected zone (HAZ) cracking during welding of austenitic alloys, including nickel base superalloys, generally involves liquation of grain boundaries and/or grain boundary phases. This presentation discusses liquation of various phases in HAZ of IN 738 nickel base superalloy, which initiate intergranular microcracking.