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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|
|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.|
|Editor:||Elsevier Sci Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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