Abstract
There is a great demand for filler metals for high-performance IN738LC Ni-base superalloy, which is widely used for blades in recent advanced gas turbines. These fillers are required to have compatible high temperature properties and hot cracking resistance. This paper reports on investigations made on the weld metal of alloys with a composition similar to that of IN783LC but varying Al, Ti and C contents. Their hot cracking susceptibility was examined by transverse Varestraint tests. The mathematical programming method was used to determine the optimum Al, Ti and C contents in the weld metal with a good balance of hot cracking resistance and mechanical properties at elevated temperatures. The method adopted was a satisficing trade-off method with a neural network model, which enabled to efficiently determine the optimum Al, Ti and C contents in the weld metal: 3%, 2% and 0.26%, respectively. The Varestraint tests indicated that the hot cracking susceptibility in the weld metal with the optimized Al, Ti and C contents was remarkably reduced. Hot tensile tests revealed that the creep rupture strength of the weld metal with that composition was also at a satisfactory level as slightly lower than that in the IN738LC base metal.
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