A proposal for a new empirical relationship between dynamic and static mechanical properties of CMn and CrMo low-alloy cast steels

Abstract

The aim of this work is to investigate the fatigue performance of low-alloy cast steels used to produce cast components, which must be heat treated in order to obtain suitable mechanical properties. Experimental results of tensile strength and fatigue properties were used to analyze existing relationship between dynamic and static mechanical properties in steels. Previous linear relationships only accurately predict the endurance limit in limited levels of tensile strength of CMn and CrMo low-alloy cast steels. A parabolic relationship between endurance limit and static tensile strength parameter has been proposed in this work. This relationship was obtained for different chemical compositions, heat treatments, and microstructures of these cast steels with static tensile strengths ranging from 300 to 1300 MPa.