Version 1
: Received: 11 September 2023 / Approved: 12 September 2023 / Online: 13 September 2023 (03:04:03 CEST)
How to cite:
Saxena, A. A Phenomenological Model for Creep and Creep-fatigue Crack Growth Behavior in Ferritic Steels. Preprints2023, 2023090804. https://doi.org/10.20944/preprints202309.0804.v1
Saxena, A. A Phenomenological Model for Creep and Creep-fatigue Crack Growth Behavior in Ferritic Steels. Preprints 2023, 2023090804. https://doi.org/10.20944/preprints202309.0804.v1
Saxena, A. A Phenomenological Model for Creep and Creep-fatigue Crack Growth Behavior in Ferritic Steels. Preprints2023, 2023090804. https://doi.org/10.20944/preprints202309.0804.v1
APA Style
Saxena, A. (2023). A Phenomenological Model for Creep and Creep-fatigue Crack Growth Behavior in Ferritic Steels. Preprints. https://doi.org/10.20944/preprints202309.0804.v1
Chicago/Turabian Style
Saxena, A. 2023 "A Phenomenological Model for Creep and Creep-fatigue Crack Growth Behavior in Ferritic Steels" Preprints. https://doi.org/10.20944/preprints202309.0804.v1
Abstract
A model to rationalize the effects of test temperature and microstructural variables on the creep crack growth (CCG) and creep-fatigue crack growth (CFCG) rates in ferritic steels is described. The model predicts that as the average spacing between grain boundary particles that initiate creep cavities decrease, the CCG and CFCG rates increase. Further, CCG data at several temperatures collapse into a single trend when a temperature compensated CCG rate derived from the model is used. CCG and CFCG behavior measured at different temperatures is used to assess the effects of variables such as differences between basemetal (BM), weldmetal (WM) and the heat-affected zone (HAZ) regions. The model is demonstrated for Grade 22 and Grade 91 steels using data from literature. It is shown that differences between the CCG behavior of Grade 22 steel in new and ex-service conditions are negligible in the BM and WM regions but not in the HAZ region. The CCG behavior of Grade 91 steels can be separated into creep-ductile and creep-brittle regions. The creep-brittle tendency is linked to the presence of excess trace element concentrations in the material chemistry. Significant differences found in the CCG rates between BM and the WM and HAZ regions of Grade 91 steel were explained.
Keywords
Creep; fatigue; Ferritic materials; crack growth; Phenomenological Model
Subject
Engineering, Metallurgy and Metallurgical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
