Research status of high-temperature creep properties of novel alumina-forming austenitic heat-resistant steel

doi:10.13251/j.issn.0254-6051.2022.05.003

Abstract

Abstract: Novel alumina-forming austenitic steel (AFA steel) is a new type of heat-resistant steel developed in recent years. It has better high-temperature oxidation resistance and creep properties than traditional heat-resistant steel, and is expected to be used in key components of ultra-supercritical units. Starting from the regulation of alloying elements of different AFA steels, the design principles of AFA steel was expounded, the influence of alloying element difference on precipitated phase was analyzed, in order to reveal the precipitation and coarsening kinetics and the relationship between creep properties and coarsening kinetics of precipitated phase, and the creep fracture mechanism at elevated temperature was summarized and the potential factors that affected the creep properties were discussed. The strengthening idea and future application of AFA steel were also prospected.

Key words: AFA steel, alloying element, precipitated phase, kinetics, high-temperature creep fracture mechanism

CLC Number:

TG142.1

Yuan Zhi, Zhang Hailian, Zhang Huijie, Ma Qingshuang, He Xiang, Bi Changbo, Li Huijun, Gao Qiuzhi. Research status of high-temperature creep properties of novel alumina-forming austenitic heat-resistant steel[J]. Heat Treatment of Metals, 2022, 47(5): 14-24.

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