期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140589
关键词
Maraging stainless steel; Precipitation hardening; Inclusion; High cycle fatigue; Fatigue crack initiation and propagation
类别
资金
- National Natural Science Foundation of China [U1908223]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2017233]
- Talent Project of Revitalizing Liaoning [XLYC1902046]
The microstructure and high cycle fatigue property of maraging stainless steels with Ti addition were studied. The crack initiation mechanism in HCF depends on the value of normalized applied stress, where high NAS is controlled by yield strength dominated by nano-size precipitates and low NAS is controlled by the distance between TiN inclusion and specimen surface.
The microstructure and high cycle fatigue (HCF) property of maraging stainless steels with Ti addition have been systematically studied. The two steels showed similar hardening responses in the aging process, which should be attributed to their identical microstructure characters, typical lath martensite immerged with dispersive precipitates Ni3Ti and R phase. It is proposed that the HCF crack initiation mechanism depends on the value of normalized applied stress (NAS). At high NAS level (slip band control region), the yield strength dominated by nano-size precipitates is the main factor controlling the HCF lifetime. At low NAS level (inclusion control region), the distance between TiN inclusion and the specimen surface is the main factor controlling the HCF lifetime. TiN inclusion could sharply increase the fatigue crack growth rate. It is found that TiN inclusion acted as the nucleation site of microcrack at front of main crack tip, thus deteriorated the crack propagation resistance of the maraging stainless steel.
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