Kumar Kandasamy PhD, Additive Manufacturing R&D Manager, Oerlikon
Shawn Kelly PhD, Head, AMCC, Oerlikon
Hastelloy X is a nickel based solution strengthened superalloy known for oxidation resistance and high temperature strength. At certain regions within the wrought or cast Hastelloy-X alloy composition space, the alloy exhibits microcracking when processed using laser powder bed fusion processes. In this presentation, amounts of minor alloying elements within the standard chemistry, part geometry, and process parameters were shown to have an influence on the crack susceptibility of L-PBF processed Hastelloy-X. The powder chemistry was shown to have the strongest influence on crack susceptibility. Analysis of the microstructure from material with and without microcracking will be presented. Results of hot-isostatic pressure heat treatment will be presented to demonstrate the ability to heal microcracks when using crack-susceptible alloy/process/geometry combinations.