Author(s) |
Subhashish Meher, Mohan Sai Kiran Kumar Yadav Nartu, Chinthaka Silva, Isabella van Rooyen, Calvin Downey, Luis Nunez, Michael Maughan, Yogesh Sighla |
Abstract Scope |
Advanced coatings systems have been utilized to protect bulk components from extreme environments such as thermal and mechanical stresses, corrosion and irradiation in nuclear reactors. The current work focuses on development of new coating materials via advanced manufacturing (AM) techniques and their advanced characterization. Here, a powder-based directed-energy deposition (DED) technique is used to synthesize functionally graded high entropy alloys (HEAs) between three commonly industrial alloys: IN718, SS316L, and 70Co30Cr. The HEAs are of interest due to their possible high strength and hardness, wide operational temperature ranges, creep and diffusion resistance, and radiation resistance. Samples are fabricated with a 1:1:1 ratio of IN718, SS316L, and 70Co30Cr where IN718 is a source of nickel and chrome, SS316 is a source of iron and chrome, and 70Co30Cr is a source of cobalt and supplemental chrome. For each sample, overall build quality, microstructure, compositional distribution, phases analyses were studied by transmission electron microscopy. |