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- Title
Improved creep‐fatigue and remnant tensile/creep properties of 321 stainless steel by self‐healing coating.
- Authors
Li, Wei; Qin, Houjun; Zhu, Shunpeng; Bo, Guowei; Sun, Tao; Jiang, Dapeng; Chen, Hui; Peng, Xulong; Chen, Jian; He, Jianjun; Ni, Song; Xiao, Canjuan; Zhang, Shengde; Chen, Anqi
- Abstract
AISI 321 steels used as intake valves in turbines are frequently subjected to creep‐fatigue (C‐F) exposure during service. Improving C‐F resistance and assessing remnant creep/tensile properties are therefore required for their safe service. In this work, the self‐healing coating consisting of Al2O3‐13TiO2 layer, TiC layer, and NiCrAlY layer was prepared for 321 steel. The effects of such self‐healing coating on the C‐F and remnant creep/tensile properties were studied. The results showed that the initial hardening phenomena of the studied steel during C‐F exposure was mainly attributed to the dislocation strengthening and a certain level of carbides precipitation strengthening, while the subsequent softening behaviors were resulted from dynamic recovery and coarsening of carbides. Moreover, as compared to other coatings, the self‐healing coating is able to improve the mechanical properties of steels due to dislocation strengthening, precipitation strengthening, and the self‐healing behavior resulting from the reaction between the TiC layer and oxygen. Highlights: The self‐healing coating was successfully prepared for AISI 321 steel.The effects of prior C‐F exposure on the remnant creep and tensile properties were revealed.Self‐healing coating could improve the C‐F life and mechanical properties of AISI 321 steel.The improved C‐F life is due to oxidation of the TiC layer in the self‐healing coating.
- Subjects
CREEP (Materials); STAINLESS steel; SURFACE coatings
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2023, Vol 46, Issue 11, p4406
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.14143