Abstract
Very high cycle fatigue behavior (107 – 109 cycles) of 304L austenitic stainless steel was studied with ultrasonic fatigue testing system (20 kHz). The characteristics of fatigue crack initiation and propagation were discussed based on the observation of surface plastic deformation and heat dissipation. It was found that micro-plasticity (slip markings) could be observed on the specimen surface even at very low stress amplitudes. The persistent slip markings increased clearly along with a remarkable process of heat dissipation just before the fatigue failure. By detailed investigation using a scanning electron microscope and an infrared camera, slip markings appeared at the large grains where the fatigue crack initiation site was located. The surface temperature around the fatigue crack tip and the slip markings close to the fracture surface increased prominently with the propagation of fatigue crack. Finally, the coupling relationship among the fatigue crack propagation, appearance of surface slip markings and heat dissipation was analyzed for a better understanding of ultrasonic fatigue damage behavior.
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Foundation Item: Item Sponsored by National Natural Science Foundation of China (10925211, 11172188) ; Fundamental Research Funds from the Central Universities of China (2012SCU04A05)
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He, C., Tian, Rh., Liu, Yj. et al. Ultrasonic fatigue damage behavior of 304L austenitic stainless steel based on micro-plasticity and heat dissipation. J. Iron Steel Res. Int. 22, 638–644 (2015). https://doi.org/10.1016/S1006-706X(15)30051-0
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DOI: https://doi.org/10.1016/S1006-706X(15)30051-0