INFLUENCE OF MAXIMUM PORE SIZE ON THE FATIGUE PERFORMANCE OF PM STEEL

Two material models for prediction of the fatigue performance of PM steels are compared. The Murakami model considers Vicker hardness and maximum defect (pore agglomerate) size. The fracture mechanics model includes defect (crack) size and threshold stress intensity factor. Both models shall be considered simultaneously and the combination gives a good prediction of PM steel fatigue limit.