Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 147, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106172
Keywords
Welded joint; High frequency impacting and rolling; Fatigue crack growth; Statistical analysis; Fatigue fracture mechanism
Funding
- National Nature Science Foundation of China [51875246]
- Natural Science Foundation of Jilin province [20180101323JC]
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The research results indicate that HFIR treatment can refine the grain sizes on the surface of welded joints and increase the hardness, elastic modulus, and residual stress, effectively extending the fatigue crack growth life of welded joints.
The influence of high frequency impacting and rolling (HFIR) on fatigue crack growth (FCG) of welded joint were researched. Results showed that grain sizes of the top surface of BM and WS were refined; Both the nanomicrohardness, elastic modulus and maximum compressive residual stress (CRS) were increased. The introduction of near-surface CRS leads to obvious changes of the surface actual stress situation, increases the crack closure and decreases the stress intensity factor of crack tip. FCG life of BM and WS increased by 1.594-1.744 times and 2.902-3.231 times. BM and WS exhibited a different fracture characterized before and after HFIR.
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