Fatigue properties and tribological tests of AlSl 316 steel after high pressure torsion

Abstract

The infuence in of the high pressure torsion process in the new die on the fatigue properties of AISI 316 corrosion-resistant steel was investigated. Eight deformation cycles was carried out at cryogenic and ambient temperatures. It was revealed that the fatigue strength of both samples increases due to the structure grinding and twinning in austenite during deformation by high pressure torsion, partially martensitic transformation and an increase in the proportion of large-angle boundaries during cyclic deformation. The main factor of the higher fatigue limit of AISI 316 steel after deformation at cryogenic temperature compared to ambient temperature is a more intensive microstructure grinding and the presence of an increased proportion of large-angle boundaries and the course of a more complete martensitic transformation.