In the last years, the role played by graphite nodules was deeply investigated by means of tensile and fatigue tests, performing scanning electron microscope (SEM) observations of specimens lateral surfaces during the tests (“in situ” tests). According to the experimental results, it is evident that graphite nodules damaging micromechanisms can’t be merely classified as matrix nodule debonding, but depend on different parameters (e.g., loading conditions and matrix microstructure). In this work, the influence of microstructure and loading conditions on fatigue crack propagation resistance in DCIs is discussed. On the basis of experimental results, the applicability of ASTM E399 standard on the characterization of fatigue crack propagation resistance in ferritic-pearlitic DCIs is critically analyzed, mainly focusing the stress intensity factor amplitude role.
Ferritic-pearlitic ductile cast irons: is K a useful parameter?
IACOVIELLO, Francesco;DI COCCO, Vittorio;ROSSI, Alessandra;
2013-01-01
Abstract
In the last years, the role played by graphite nodules was deeply investigated by means of tensile and fatigue tests, performing scanning electron microscope (SEM) observations of specimens lateral surfaces during the tests (“in situ” tests). According to the experimental results, it is evident that graphite nodules damaging micromechanisms can’t be merely classified as matrix nodule debonding, but depend on different parameters (e.g., loading conditions and matrix microstructure). In this work, the influence of microstructure and loading conditions on fatigue crack propagation resistance in DCIs is discussed. On the basis of experimental results, the applicability of ASTM E399 standard on the characterization of fatigue crack propagation resistance in ferritic-pearlitic DCIs is critically analyzed, mainly focusing the stress intensity factor amplitude role.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
