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Healing of Fatigue Crack by High-Density Electropulsing in Austenitic Stainless Steel Treated with the Surface-Activated Pre-Coating

Department of Mechanical Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Materials 2013, 6(9), 4213-4225; https://doi.org/10.3390/ma6094213
Received: 22 August 2013 / Revised: 14 September 2013 / Accepted: 16 September 2013 / Published: 23 September 2013
A technique to heal a fatigue crack in austenitic stainless steel SUS316 by applying a controlled, high-density pulsed current was developed. A surface-activated pre-coating (SAPC), which eliminates the oxide layer and coats a Ni film on the crack surface, was used to improve the adhesion between crack surfaces. Cracks were observed by scanning electron microscopy before and after the application of high-density electropulsing. To evaluate the healing effect of the SAPC during crack propagation, fatigue tests were conducted under a constant stress intensity factor. The fatigue crack treated with the SAPC was found to be effectively healed as a result of electropulsing, and also showed a slower rate of crack propagation. View Full-Text
Keywords: healing; crack; fatigue; electropulsing; propagation; coating healing; crack; fatigue; electropulsing; propagation; coating
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Hosoi, A.; Kishi, T.; Ju, Y. Healing of Fatigue Crack by High-Density Electropulsing in Austenitic Stainless Steel Treated with the Surface-Activated Pre-Coating. Materials 2013, 6, 4213-4225.

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