Rolling Contact Fatigue (RCF) resistance of Austempered Ductile Iron (ADI)

DOMMARCO, R. C.; BASTIAS, P. C.; DALL´O, H. A.; HAHN, G. T.; RUBIN, C. A.

WEAR

Elsevier Science B.V.

Año: 1998 vol. 221 p. 69 - 74

0043-1648

The present work reports on the Rolling Contact FatigueRCF.resistance of Austempered Ductile IronADI.as evaluated by using a ball–rod rolling contact fatigue tester. The tests were carried out until a spall was detected with a load ratio p0rkks6, where p0 is the maximum Hertz stress and kk the kinematic shear yield stress. The results obtained for the RCF tests were compared with the properties of AISI 440C and SAE 52100 bearing steels. The spalls were observed using optical and electron scanning microscopy. The microstructure was found to have a strong influence in RCF results. It is concluded that ADI has good resistance to crack propagation but low resistance to crack nucleation. The RCF resistance of ADI under the present experimental conditions is not satisfactory.RCF.resistance of Austempered Ductile IronADI.as evaluated by using a ball–rod rolling contact fatigue tester. The tests were carried out until a spall was detected with a load ratio p0rkks6, where p0 is the maximum Hertz stress and kk the kinematic shear yield stress. The results obtained for the RCF tests were compared with the properties of AISI 440C and SAE 52100 bearing steels. The spalls were observed using optical and electron scanning microscopy. The microstructure was found to have a strong influence in RCF results. It is concluded that ADI has good resistance to crack propagation but low resistance to crack nucleation. The RCF resistance of ADI under the present experimental conditions is not satisfactory.