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https://doi.org/10.1016/j.engfailanal.2024.109150
Copy DOIJournal: Engineering Failure Analysis | Publication Date: Dec 1, 2024 |
High-strength alloy steel, 25Cr2Ni4MoV, finds extensive application in the nuclear and petroleum industries. Experimental investigations and numerical simulations on the influence of laser shock peening on the fatigue characteristics of 25Cr2Ni4MoV alloy are conducted to examine the effect of this strengthening technique. The fatigue dangerous spots are all located at the excessive arc in the left side of the model, according to numerical fatigue simulations; With laser shock peening, the stress amplitude caused by the external load may be greatly reduced, increasing the fatigue life and improving the accuracy of the fatigue simulation model in predicting the potential fatigue fracture site. The fatigue test results indicate that after laser shock peening treatment, the number of fatigue cycles of the specimens was increased from 177,185 to 309,918, representing a significant improvement of 74.9 %. The laser shock peening can markedly enhance the fatigue resistance of 25Cr2Ni4MoV. The fatigue fracture morphology of the specimen exhibits multiple crack initiation sites. Following laser shock peening treatment, the mean distance between the fatigue striations in the fatigue propagation area is reduced. The striation spacing has decreased from 1.34 μm to 1.03 μm, resulting in a decrease of approximately 23.1 %, the rate of fatigue crack growth is reduced, and the area where the crack propagates is significantly increased.
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