Small fatigue crack growth mechanisms of 304 stainless steel under different stress levels

•The stress level effect on small crack growth rates could hardly be distinguished in the stress levels tested.•Grain boundaries are crack initiation sites and affect the propagation behavior.•Once the surface crack length reaches 0.2mm, the crack will propagate quickly. The aim of this paper was to...

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Bibliographic Details
Published in:International journal of fatigue 2014-07, Vol.64, p.14-21
Main Authors: Deng, G.J., Tu, S.T., Wang, Q.Q., Zhang, X.C., Xuan, F.Z.
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steels
Crack initiation
Crack propagation
Exact sciences and technology
Fatigue
Fatigue failure
Fracture mechanics
Grain boundaries
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Replica
Small crack
Stainless steel
Stress level
Stresses
Surface cracks
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Summary:•The stress level effect on small crack growth rates could hardly be distinguished in the stress levels tested.•Grain boundaries are crack initiation sites and affect the propagation behavior.•Once the surface crack length reaches 0.2mm, the crack will propagate quickly. The aim of this paper was to clarify the fatigue crack initiation and small crack growth mechanisms of 304 austenitic stainless steel at different stress levels. Results showed that the stress level effect on small crack growth rates could hardly be distinguished for the stress levels tested. Grain boundaries might act as the crack initiation sites and played an important role on the propagation of small cracks. Once the surface crack length reached the critical size of 0.2mm, the crack would propagate fairly quickly, resulting in fracture of specimen.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2014.01.027