Study of the Properties of Antifriction Rings Under Severe Plastic Deformation

Abstract

A study was conducted of the properties of brass blanks for antifriction rings under severe plastic deformation by high pressure torsion. The evolution of microstructure and mechanical properties of deformed blanks after 6 cycles of deformation by high-pressure torsion at 500°C were studied. All metallographic studies were carried out using modern methods: transmission electron microscopy (TEM) and analysis of patterns of back-reflected electron diffraction (EBSD). As a result of deformation an ultrafine grain structure with the presence of a large number of large-angle boundaries was obtained. Strength properties of brass increased in comparison with an initial condition almost in 3 times, microhardness also increased in 3 times, i. e. increased from 820 MPa in initial condition up to 2115 MPa after deformation. Thus the greatest gain of strength properties falls at the first two cycles of deformation