Abstract
This study examined how to increase the vibration fatigue fracture resistance, under resonant conditions, of spheroidal graphite (SG) cast iron by controlling the matrix structure. Experimental results indicated that variations in the matrix structure slightly influenced resonant frequency, but significantly dominate the initial deflection amplitude and resonant vibration fracture resistance.The resonant vibration fracture behaviour of ferritic and pearlitic specimens could be divided into four steps, those are (1) crack initiation, (2) crack linking, (3) major crack formation and (4) major crack propagation along the through-thickness direction. Worthy of noticing is that there is no major crack formation during the fracture process of austempered ductile iron (ADI). In the case of the tempered martensite sample, resonant vibration caused an instantly catastrophic failure.In addition, since the tough bainitic matrix can effectively arrest crack propagation, the ADI specimen exhibited the highest vibration fracture resistance under an identical initial deflection amplitude.
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