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

A ductile iron was austempered at 302 and 385°C for various times to get lower and upper ausferrite microstructures respectively. The microstructures were characterised hy y optical microscopy and X-ra y diffraction. Plane strain fracture toughness was determined under all heat treatment conditions. While the austempered ductile iron with lower ausferrite microstructure showed higher fracture toughness, the one with upper ausferrite microstructure exhibited higher tensile toughness and strain hardening coefficient. A model was developed relating fracture toughness to the yield strength (σ y ) volume fraction of retained austenite (X y ) and the carbon content of the retained austenite (C y ). Experimental results showed excellent agreement with the prediction of the model that K 2 1C is proportional to σ y (X γ C γ ) 1/2 .

Comparative study of fracture toughness of austempered ductile irons with upper and lower ausferrite microstructures

Studies have been conducted on the effect of overstressing in rotary bending fatigue on the fatigue properties of an annealed and austempered ductile iron containing 1.5 Ni-0.3 Mo. For various R ratios S-N curves were determined and the fatigue limit estimated. It was found that the fatigue limit was a function of the level of overstressing and cycle ratio. In the case of austempered samples a beneficial effect of overstressing was observed at a certain level of overstressing. This was related to the work hardening behaviour of the austenite phase. In annealed samples, a reduction in the fatigue limit was observed at all levels of overstressing.

Effect of overstressing on fatigue behaviour of austempered ductile iron

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Effect of overstressing on fatigue behaviour of austempered ductile iron