ISSN 2594-5327
49º Congresso anual — Vol. 49, Num. 1 (1994)
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Resumo
Measurements of fatigue crack propagation (FCP) rates in Cu-0.67 at% Co-1.1 at% Si and Cu-0.34 at% Co-0.95 at% Si alloys were studied in order to investigate the influence of precipitation processes. The ageing treatment was found to decrease crack growth rates at lower values of the stress intensity factor. Microcalorimetric analysis of plastic zones revealed that precipitate destruction increases with the stress intensity amplitude according to a ΔK²/³ law on the basis of a simple continuum mechanics model. The increase in precipitate destruction is associated with the enhanced tendency of the slip distribution to become finer. At high growth rates close to the rapid tensile fracture region it is suggested that the overall destruction process is lowered owing to the fact that plastic deformation concentrates mainly in the dimple walls. Microvoid coalescence appears to be largely unaffected by the presence of the precipitates.
Palavras-chave
fatigue crack propagation, Cu-Co-Si alloys, microstructure, precipitates, stress intensity, plastic deformation
Como citar
Donoso, Ari Varschavsky, Eduardo.
Influence of Microstructure on the Subcritical Crack Growth in Cu-Co-Si Alloys,
p. 1034-1041.
In: 49º Congresso anual,
Rio de Janeiro, Brasil,
1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v2-503-510
