A Study of the Creep-Fatigue Damage Mechanism of a P92 Welded Joint Using Nanoindentation Characterization

In fossil fuel and nuclear power plants, welded joints continuously experience creep-fatigue loading, which can result in premature cracking during the in-service term. To study the creep-fatigue interactive (CFI) behavior, the CFI test of P92 steel was performed with different strain rates at 823 K...

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Bibliographic Details
Published in:Metals (Basel ) 2025-01, Vol.15 (1), p.53
Main Authors: Jin, Zhangmin, Cai, Zhihui, Gu, Xuecheng, Wang, Zhiqiang, Han, Yiwen, Yu, Ting, Song, Yuxuan, Gao, Zengliang, Zheng, Zhongrui
Format: Article
Language:English
Subjects:
Crack initiation
Creep fatigue
Creep strength
Damage
Elastic deformation
Fatigue cracking
Fatigue failure
Fatigue tests
Fracture mechanics
Grain size
Heat resistant steels
High strength steels
Load
Mechanical properties
Metal fatigue
Microstructure
Modulus of elasticity
Nanoindentation
Nuclear power plants
Nucleation
Scanning electron microscopy
Steel pipes
Strain rate sensitivity
Temperature
Welded joints
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Summary:In fossil fuel and nuclear power plants, welded joints continuously experience creep-fatigue loading, which can result in premature cracking during the in-service term. To study the creep-fatigue interactive (CFI) behavior, the CFI test of P92 steel was performed with different strain rates at 823 K. Results indicate that the short cycle life is measured with the increasing strain rate. Relying on the scanning electron microscope, the fracture mechanism of P92 steel gradually changes from fatigue-dominating to creep-fatigue interactive damage with the increasing strain rate. The hardness (H), elastic modulus (E) and creep deformation were then measured by nanoindentation, and the strain rate sensitivity (m) was estimated. The relation between the degenerated mechanical properties and microstructural evaluations, i.e., enhanced grain size and nucleation of creep voids, was established, and the damage mechanism was discussed.
ISSN:2075-4701
2075-4701
DOI:10.3390/met15010053