Abstract
This article deals with a new nonconventional microscopic fracture mode with a characteristic feature: the tearing topography surface (TTS), associated with hydrogen embrittlement processes in pearlitic steel. The TTS mode appeared in fracture tests on precracked and notched specimens when tested under hydrogen charging. Experimental results showed phenomenological relations between the size of the TTS region and variables such as the electrochemical potential and the maximum stress intensity factor during fatigue precracking (for cracked samples) or the time to failure and the geometry (for notched samples). A hydrogen diffusion model is proposed which explains, from the theoretical point of view, the phenomenological relations between the TTS size and the test variables. According to this model, hydrogen diffuses not only toward the places of minimum concentration, but also to the sites of maximum hydrostatic stress.
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Formerly Associate Professor, Department of Materials Science, Polytechnical University of Madrid
Formerly Associate Professor, Department of Materials Science, Polytechnical University of Madrid
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Toribio, J., Lancha, A.M. & Elices, M. The tearing topography surface as the zone associated with hydrogen embrittlement processes in pearlitic steel. Metall Trans A 23, 1573–1584 (1992). https://doi.org/10.1007/BF02647339
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DOI: https://doi.org/10.1007/BF02647339