Microstructure influence on fatigue crack propagation considering two spheroidal cast irons, characterised by a ferritic-perlitic microstructure (% ferrite = 80%) and a perlitic microstructure (% perlite > 95%) respectively, was investigated. This analysis was performed considering the influence of stress ratio (R = 0.1, 0.5, 0.75). Tests were performed in laboratory conditions, with a loading frequency of 20 Hz. Fracture surfaces were analysed both by means of a scanning electron microscope (SEM) and performing a fracture surface roughness analysis in order to investigate the crack advancing micromechanisms and to quantify the influence of crack surface roughness on crack closure effect, respectively.
Matrix influence on fatigue crack propagation in spheroidal cast irons
Iacoviello F.
;Polini W.
2000-01-01
Abstract
Microstructure influence on fatigue crack propagation considering two spheroidal cast irons, characterised by a ferritic-perlitic microstructure (% ferrite = 80%) and a perlitic microstructure (% perlite > 95%) respectively, was investigated. This analysis was performed considering the influence of stress ratio (R = 0.1, 0.5, 0.75). Tests were performed in laboratory conditions, with a loading frequency of 20 Hz. Fracture surfaces were analysed both by means of a scanning electron microscope (SEM) and performing a fracture surface roughness analysis in order to investigate the crack advancing micromechanisms and to quantify the influence of crack surface roughness on crack closure effect, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
