|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Additive Manufacturing for Energy Applications IV
||Optimization, Processing and Characterization of a Crack-resistant High-gamma Prime Superalloy for Additive Manufacturing in Power Generation Applications
||Ning Zhou, Stephane A.J. Forsik, Austin D. Dicus, Tao Wang, Gian A. Colombo, Andrew Holliday, Michael M. Kirka, Alexander J.G. Lunt, Mario E. Epler
|On-Site Speaker (Planned)
||Stephane A.J. Forsik
A nickel-base superalloy with 55-60 vol.% of gamma prime precipitate and a balance of hot cracking resistance, high-temperature mechanical properties and resistance to environmental damage was created to enable the redesign of critical turbine hot-gas-path components using additive manufacturing.
The composition was optimized using a combination of thermodynamic modeling, high-throughput screening and experimental melting. Printing of complex parts with fine internal features show that the alloy can be processed by both selective laser and electron beam melting. Extensive characterization of the grain size, grain boundary composition, gamma prime distribution and gamma/gamma prime misfit was performed and the post-processing parameters were tailored for the alloy to generate 1200 MPa ultimate tensile strength and 1120 MPa yield strength at 760 degrees C. Oxidation resistance is provided by a dense layer of alumina that offers protection up to 1000 degrees C.
||High-Temperature Materials, Additive Manufacturing, Powder Materials