Study of surface fatigue of wear resistant powder metallurgical materials

Abstract

The problem of the fatigue strength of wear resistant materials is significant both from the theoretical and practical points of view. In abrasive wear, two different mechanisms of material removal occur either separately or simultaneously. At abrasion and low-angle abrasive erosion, microcutting is dominating and the main criterion for materials selection is hardness. At high-angle impact as well as at oblique impact by irreversible deformation, the exposed surface should be able to withstand repeated deformation, where low-cycle fatigue mechanism is dominating. The aim of this work was to determine and compare the surface fatigue behaviour of the high-tech powder metallurgical materials-PM/HIPed tool steels and conventional wear resistant steels. An attempt to find correlation between abrasive erosion and impact wear rates with materials surface fatigue resistance was made.