Date of Award


Document Type

Open Access Master's Thesis

Degree Name

Master of Science in Materials Science and Engineering (MS)

Administrative Home Department

Department of Materials Science and Engineering

Advisor 1

Paul Sanders

Committee Member 1

John Shingledecker

Committee Member 2

Daniel Seguin

Committee Member 3

Walter Milligan


To advance sustainability efforts, electric power plants have reduced specific carbon dioxide emissions by increasing operating temperatures and pressures to improve power generation efficiency. The latest improvements are utilized in advanced ultra-supercritical power generation. To meet these operating conditions, nickel superalloys are used in the highest temperature components; however, they are expensive and present weldability challenges. This project aims to experimentally optimize a nickel superalloy to improve material weldability and decrease cost without compromising strength. Three optimized compositions were developed, and their microstructures and mechanical properties were compared to Nimonic 263, a common nickel superalloy in electric power plants. The Optimized Composition 1 alloy was scaled up to assess weld solidification cracking resistance compared to baseline nickel superalloys. It was found that the Optimized Composition 1 alloy has decreased cost, increased weldability, and comparable strength to Nimonic 263. With further testing, this alloy may be a viable replacement for some commercial nickel superalloys in advanced ultra-supercritical power generation.

Included in

Metallurgy Commons