Influence of process parameters on short fatigue crack growth on carburised case of DIN 20MnCr5 steel

Abstract

Carburising, quenching, tempering and shot peening treatments are widely used on mass production of automotive industry, such as pinion gears and master gears. Variations on these processes may influence the flexural fatigue life of described components. The aim of this work was to study the influence of variations in shot peening time and variations in tempering temperature, of short fatigue cracks growth of carburised case of DIN 20MnCr5 steel. Samples blasted about 30 min and 1 h and tempered at 160°C, showed the best results relative to crack growth and to fatigue life.