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

The aim of this work is, to investigate the fatigue performance of low-allo y cast steels used to produce cast components, which must be heat treated i n order to obtain suitable mechanical properties. Experimental results of t ensile strength and fatigue properties were used to analyze existing relati onship between dynamic and static mechanical properties in steels. Previous linear relationships only accurately predict the endurance limit in limite d levels of tensile strength of CMn and CrMo low-alloy cast steels. A parab olic relationship between endurance limit and static tensile strength param eter has been proposed in this work. This relationship was obtained for dif ferent chemical compositions, heat treatments, and microstructures Of these cast steels with static tensile strengths ranging from 300 to 1300 MPa.