Establishment of unified creep–fatigue life prediction under various temperatures and investigation of failure physical mechanism for Type 304 stainless steel

Investigations into creep–fatigue life and the corresponding failure physical mechanism are crucial for guaranteeing the structural integrity of components. In this work, a series of strain‐controlled fatigue and creep–fatigue tests were performed at different temperatures. Then, the EBSD‐TEM combin...

Full description

Saved in:
Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2022-10, Vol.45 (10), p.3086-3101
Main Authors: Xu, Le, Wang, Run‐Zi, He, Lei, Zhang, Xian‐Cheng, Tu, Shan‐Tung, Miura, Hideo, Itoh, Takamoto
Format: Article
Language:English
Subjects:
creep–fatigue
Failure analysis
Fatigue failure
Fatigue life
Fatigue tests
geometrically necessary dislocation
Life prediction
Metal fatigue
Microstructure
misorientation
parameter dependence
Stainless steels
Structural integrity
Temperature dependence
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Investigations into creep–fatigue life and the corresponding failure physical mechanism are crucial for guaranteeing the structural integrity of components. In this work, a series of strain‐controlled fatigue and creep–fatigue tests were performed at different temperatures. Then, the EBSD‐TEM combinative analysis was performed to reveal the microstructure evolution. The creep failure parameter dependence derived from standard creep experimental data and their importance in further creep–fatigue employment were discussed. Results show that strain energy density has better relevance than ductility in connecting with creep failure. The temperature‐dependent critical strain energy density and an equivalent failure strain energy density, considering geometric effect, were incorporated with the current energy‐based model, which enables creep–fatigue life scatter within a factor of 1.5. Moreover, multi‐slip activations and severe slip interactions under creep–fatigue conditions were responsible for the ultimately lifetime reductions based on microstructure observations. Highlights Exploring the parameter dependence of creep failure. Performing creep–fatigue tests under various temperatures. Establishing a unified creep–fatigue life prediction model based on strain energy. Revealing the microscopic interactions between creep and fatigue.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13794