Short crack fatigue threshold of a nitrided and shot peened low alloy steel

Abstract

In this paper the effect of nitriding followed by shot peening is investigated on the fatigue threshold of a low-alloy steel by means of experimental rotating bending tests carried out on sandglass specimens containing a micro-hole acting as a pre-crack. Different sizes of micro-hole obtained with different processes were considered to assess the influence of crack dimension on fatigue strength in the field of short cracks. © 2011 Published by Elsevier Ltd.