Question
Cracking occurred in the HAZ of an Inconel 738 superalloy turbine blade that was postweld heated treated at a solutioning temperature of 1205C after gastungsten
Cracking occurred in the HAZ of an Inconel 738 superalloy turbine blade that was postweld heated treated at a solutioning temperature of 1205C after gastungsten arc welding. The microstructure in the HAZ near cracking showed very fine precipitates with high area fraction. The composition of the alloy was Ni15.84Cr8.5Co3.47Ti3.46Al2.48W1.88Mo1.69Ta0.92Nb0.11C0.12Fe0.12B0.04Zr.
(a) What type of cracking is this?
(b) Explain why this alloy is susceptible to this type of cracking.
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Transport Processes And Separation Process Principles
Authors: Christie Geankoplis, Allen Hersel, Daniel Lepek
5th Edition
0134181026, 978-0134181028
