Creep Analysis and Microstructural Evaluation of a Novel Additively Manufactured Nickel-Base Superalloy (ABD®-900AM)

Abstract Nickel-base superalloys containing 30 to 50% gamma prime (γ') volume fraction are typically used in hot section components (e.g., guide vanes or blades) for power generating gas turbines, and suitable time-dependent properties required long-term elevated temperature operation. Additive manufacturing (AM) has recently been develop complex hot-section parts utilizing innovative designs with enhanced cooling features which improve efficiencies by reducing air consumption. To further explore the opportunity AM superalloys, this paper focuses on a fundamental creep study characterization of novel nickel-base superalloy (ABD-900AM) that was manufactured using laser-based powder bed fusion (LBPBF) process. The material subjected subsolvus solution anneal multistep aging heat treatment (HT) produce bi-modal distribution ∼35% without postprocessing isostatic pressing (HIP). Microstructural carried out as-built fully heat-treated structures, creep-rupture test program conducted resultant properties. Activation energies stress exponents addition rupture strength deformation resistance were compared traditionally cast IN939 IN738 materials. After testing, specimens evaluated variety microscopy tools determine location associated damage. optimized chemistry ABD-900AM printed crack free dense contrast studies similar alloys where significant process development postbuild treatments required. High-temperature mechanical showed some decrease when traditional casting. This life debit dependent build orientation, but considerable increase ductility observed due differences microstructure alloys. Analysis data mechanisms relationship between is discussed, ongoing work through heat-treatment optimization will be highlighted.