Mechanism-based modeling for low cycle fatigue of cast austenitic steel

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DOIResolve DOI: https://doi.org/10.1007/s11661-017-4160-4
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  1. National Research Council Canada. Aerospace
FormatText
TypeArticle
Journal titleMetallurgical and Materials Transactions A
ISSN1073-5623
1543-1940
Volume48
Issue9
Pages4058–4071
Abstract
A mechanism-based approach—the integrated creep-fatigue theory (ICFT)—is used to model low cycle fatigue behavior of 1.4848 cast austenitic steel over the temperature range from room temperature (RT) to 1173 K (900 °C) and the strain rate range from of 2 × 10−4 to 2 × 10−2 s−1. The ICFT formulates the material’s constitutive equation based on the physical strain decomposition into mechanism strains, and the associated damage accumulation consisting of crack nucleation and propagation in coalescence with internally distributed damage. At room temperature, the material behavior is controlled by plasticity, resulting in a rate-independent and cyclically stable behavior. The material exhibits significant cyclic hardening at intermediate temperatures, 673 K to 873 K (400 °C to 600 °C), with negative strain rate sensitivity, due to dynamic strain aging. At high temperatures >1073 K (800 °C), time-dependent deformation is manifested with positive rate sensitivity as commonly seen in metallic materials at high temperature. The ICFT quantitatively delineates the contribution of each mechanism in damage accumulation, and predicts the fatigue life as a result of synergistic interaction of the above identified mechanisms. The model descriptions agree well with the experimental and fractographic observations.
Publication date
PublisherSpringer
LanguageEnglish
Peer reviewedYes
NPARC number23002138
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Record identifier385f34ee-c572-427c-832e-666b43a79f08
Record created2017-08-24
Record modified2019-03-13
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