Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 151, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106377
Keywords
Cold expansion; Hole structure; Low-cycle fatigue; Quantitative fracture analysis
Funding
- National Key Reseach Program [J2019-VII-0015-0155]
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The research showed that the fatigue life of cold-expanded specimens is more than doubled compared to the original, and the fatigue gain decreases with increasing stress. The cold-expanded specimens have compressive residual stress and cold work-hardened structure, which increase the initiation life and inhibit crack propagation under high temperature and stress.
Low-cycle fatigue properties before/after cold expansion under multiple conditions were comparatively researched. The results showed the fatigue cycles of the cold-expanded specimens are more than doubled compared to the original, and the fatigue gain decreased as the stress increased. Surface smoothing, surface compressive residual stress field, and cold work-hardened structure with the sub-grain refinement were recognized as the main reasons for increasing the initiation life. The relatively stable compressive residual stress under 400 degrees C aging and 820 MPa/RT limited the crack propagation, making the width of the fatigue band and the crack propagation speed of cold-expanded specimen smaller than hole-reamed at the same depth.
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