Nickel Superalloy Composition and Process Optimization for Improved Weldability

Document Type

Conference Proceeding

Publication Date

1-1-2026

Abstract

Improving the efficiency of advanced ultra-supercritical power plants requires hotside materials that maintain mechanical propertiesMechanical properties in high pressure and high temperature environments. Nickel superalloysNickel superalloy are a viable yet expensive option, but weldingWelding challenges can lead to premature joint failures. The goal of this work was to experimentally evaluate nickel superalloysNickel superalloy computationally designed to lower alloy cost and for improved weldabilityWeldability while maintaining mechanical propertiesMechanical properties. Two optimized nickel alloys were designed to these targets and compared to benchmark nickel superalloysNickel superalloy (Nimonic 263, Waspaloy, and/or 740H). Both optimized alloys (5Co-4Ti, 7Co-3Ti) had lower cost than benchmark superalloysSuperalloy. The 7Co-3Ti alloy had similar elastic modulus and room temperature hardnessHardness to the benchmark alloys, while the 5Co-4Ti alloy exceeded room temperature hardnessHardness and elastic modulus values. Solidification crackingSolidification cracking and strain-age cracking were assessed, and 7Co-3Ti had increased strain age and solidification crackingSolidification cracking resistance compared to commercial alloys.

Publication Title

Minerals Metals and Materials Series

ISBN

[9783032351753]

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