Creep-fatigue interaction properties of heavy-duty gas turbine disc steel independently developed in China

Le résumé fourni par la source

This study investigated the creep-fatigue interaction (CFI) behaviours and failure mechanisms of 13Cr10Mo1W1VNbN steel, a newly developed material for use in China’s independently designed heavy-duty gas turbines. The results indicate that tensile dwell, particularly long-term dwell of 1800 s, significantly reduces failure life, while compressive dwell has a comparatively minor influence on cyclic performance. Typical features such as creep voids, oxidation, and microcrack branching, confirm the combined effects of creep and oxidation-induced degradation as primary contributors to life reduction under long-term tensile dwell. However, there is no evident features of creep damage observed on the fracture surfaces under compressive dwell conditions. Notably, compressive stress-induced crack closure, along with microstructural changes such as low and high angle boundaries, was found to effectively suppress crack propagation. This study offers theoretical support for evaluating the service life of high-temperature turbine components and guiding the design of damage-resistant alloys for advanced gas turbine applications.

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