Novel steel demonstrates extended rupture time under high stress in ultra-supercritical power applications, suggesting a breakthrough in material design.
This study presents the design of a novel heat-resistant steel derived from the P91 steel, achieved through precise control of C, Mo, V, and Cr contents, along with the addition of Ti and Ta. We found that the multi-component MC carbides possess exceptional thermal stability, maintaining a stable orientation relationship with the matrix following 650 °C creep testing. Additionally, these nanoscale needle-like carbides exhibit a pronounced dislocation pinning effect. Consequently, this steel demonstrates an extended rupture time under high stress conditions compared to conventional steels, highlighting its considerable potential for applications in ultra-supercritical power rotors.
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Jin et al. (2026) studied this question.
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