Effect of cyclic softening and stress relaxation on fatigue behavior of 2.25Cr1Mo0.25V steel under strain-controlled fatigue-creep interaction at 728 K

Low cycle fatigue behavior of bainitic 2.25Cr1Mo0.25 V steel is studied at 728 K in air by strain amplitudes from 0.2% to 0.6%. Dwell period from 5 s to 600 s, is applied at peak strains to investigate its influence on cyclic response and crack initiation. Microstructural observations are performed...

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Bibliographic Details
Published inInternational journal of fatigue Vol. 140; p. 105848
Main Authors Zhao, Zizhen, Chen, Xu
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.11.2020
Elsevier BV
Subjects
Bainitic steel
Crack initiation
Crack propagation
Creep life
Cyclic softening
Dwell effect
Failure mechanisms
Fatigue cracks
Fatigue failure
Fatigue life
Fatigue life prediction
Low cycle fatigue
Materials fatigue
Metal fatigue
Softening
Strain
Stress relaxation
Stress relaxation
Cyclic softening
Dwell effect
Fatigue life prediction
Low cycle fatigue
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Summary:Low cycle fatigue behavior of bainitic 2.25Cr1Mo0.25 V steel is studied at 728 K in air by strain amplitudes from 0.2% to 0.6%. Dwell period from 5 s to 600 s, is applied at peak strains to investigate its influence on cyclic response and crack initiation. Microstructural observations are performed to identify the failure mechanism. The dwell periods decrease fatigue endurance by increasing cyclic softening of the steel and incubating incipient fatigue cracks. The stress relaxed during dwell is closely related with fatigue life decreasing. The modified method considered stress relaxation effect estimates low cycle fatigue and fatigue-creep life well.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105848