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Influence of the crystalline orientation on microcrack initiation in low-cycle fatigue

Abstract : Present study aims at analyzing the crack initiation in an austenitic stainless steel in low-cycle fatigue. A fatigue test was carried out using a polished specimen. The surface of the specimen was observed in situ during the fatigue test, in order to establish the time of slip activity or crack initiation. After a number of cycles sufficient to initiate small cracks, the test was stopped and the surface observed by scanning electron microscopy. The electron backscattered diffraction technique (EBSD) was used to identify the orientations of surface grains in the central zone of the fatigue specimen. Crack-initiation sites and slip systems associated to the initiated microcracks were identified. The criterion of the maximum Schmid factor explains two-thirds of the cracks initiated in slip systems; however if the favorably oriented slip band with respect to this criterion makes an angle of around 45° to the loading direction, a crack may initiate in another slip system.
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Contributor : Véronique Aubin Connect in order to contact the contributor
Submitted on : Monday, April 22, 2013 - 11:32:12 PM
Last modification on : Saturday, December 18, 2021 - 3:28:15 AM




Pengfei Mu, Véronique Aubin, Iris Alvarez-Armas, Alberto Armas. Influence of the crystalline orientation on microcrack initiation in low-cycle fatigue. Materials Science and Engineering: A, Elsevier, 2013, 573, pp.45-53. ⟨10.1016/j.msea.2013.02.046,⟩. ⟨hal-00816792⟩



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