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Type: Artigo de periódico
Title: Effect of precipitates on the corrosion-fatigue crack initiation of ISO 5832-9 stainless steel biomaterial
Author: Giordani, EJ
Guimaraes, VA
Pinto, TB
Ferreira, I
Abstract: The correlation between the microstructure and fatigue crack initiation behavior (in air and 0.9% NaCl solution) of ISO 5832-9 austenitic stainless steel biomaterial was investigated. A combination of techniques such as extraction of precipitates, SEM, EDS and X-ray diffraction was found to be very useful to characterize Z-phase precipitates, which are abundant in this steel. An analysis of fatigue crack initiation, using SEM, revealed that fatigue and corrosion-fatigue cracking initiate preferentially in the elongated Z-phase precipitates, which are parallel to the tensile direction, and in coarse precipitates usually associated with M-rich nonmetallic inclusions. Crack initiation is caused by particle rupture rather than by separation of the particle/matrix interface. The findings indicate that coarse Z-phase precipitates and nonmetallic inclusions are detrimental to the fatigue properties of the steel. These microstructural constituents accelerate the initiation of fatigue and especially corrosion-fatigue cracks. (C) 2004 Elsevier Ltd. All rights reserved.
Subject: biomaterial
stainless steel
crack initiation
Country: Inglaterra
Editor: Elsevier Sci Ltd
Citation: International Journal Of Fatigue. Elsevier Sci Ltd, v. 26, n. 10, n. 1129, n. 1136, 2004.
Rights: fechado
Identifier DOI: 10.1016/j.ijfatigue.2004.03.002
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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