Field emission scanning electron micrographs of fatigue crack growth in 316L steel following a single tensile overload

Wheatley, G., Hu, X.Z., and Estrin, Y. (1997) Field emission scanning electron micrographs of fatigue crack growth in 316L steel following a single tensile overload. In: Proceedings of the 1997 Workshop and State Conference of the Australian X-ray Analytical Association (WA Branch) and the Western Australian Society of Electron Microscopy. pp. 13-18. From: 1997 Workshop and State Conference of the Western Australian X-ray Analytical Association and the Western Australian Society of Electron Microscopy, 1997, Perth, WA, Australia.

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Abstract

The aim of this study was to investigate the crack tip region and fracture surfaces of a 316L stainless steel that had been subjected to a single tensile overload following fatigue. Field Emission Scanning Electron Microscopy (FESEM) was utilised for this purpose. The plane stress condition prevailed during testing. The micrographs suggest that a damaged zone (fatigue process zone) exists ahead of the crack tip. The micrographs show: that the fracture surface following overload, with or without fatigue after the overload, looks similar to that prior to overload, but has been formed under different conditions. The micrographs also suggest that an overload that does not exceed the fracture toughness, Kc, enhances the damage present in the fatigue process zone to a much lesser extent than an overload exceeding Kc. If the overload does exceed Kc, voids and quasi-cleavage microcracks become apparent. Results from previous work by the authors [ 1,2] are supported by the findings of the present study.

Item ID: 58775
Item Type: Conference Item (Presentation)
Date Deposited: 05 Feb 2020 23:43
FoR Codes: 09 ENGINEERING > 0913 Mechanical Engineering > 091399 Mechanical Engineering not elsewhere classified @ 100%
SEO Codes: 86 MANUFACTURING > 8614 Machinery and Equipment > 861499 Machinery and Equipment not elsewhere classified @ 100%
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