|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Development of Novel Chromium-superalloys Strengthened by B2 Intermetallic Precipitates
||Kan Ma, Jóhan Pauli Magnussen, Anke S. Ulrich, Till König, Mathias C. Galetz, Alexander J. Knowles
|On-Site Speaker (Planned)
Common to many high temperature applications, increases in operating temperature are eagerly sought to improve the thermal efficiency of concentrated solar plants (CSPs). However, increasing operating temperature creates new challenges for the materials employed. Chromium (Cr) offers significant advantages for advanced CSPs with its high melting point, low price and good resistance in corrosive environments. However, the mechanical properties of Cr-based materials still need improvement to match current nickel superalloys, both for creep resistance and low temperature toughness. Here we explore the ‘bcc-superalloy’ design concept by introducing ordered-bcc (B2) NiAl precipitates into disordered-bcc (A2) Cr matrix to give Cr-superalloys that are hoped to confer attractive properties. This work addresses the demonstration and optimization of B2-A2 microstructures. The influence of alloying content, alloying element and thermal treatment on the morphology, distribution and volume fraction of precipitates is investigated alongside their influence on mechanical and environmental properties.
||Characterization, High-Temperature Materials,