Effects of chemical composition and heat treatment on elastic moduli of engineering steels

The elastic moduli of 20 kinds of engineering steels were measured by the ultrasonic pulse method. For quench-tempered carbon and low alloy steels, a linear model can be used to explain the moduli with an accuracy of 0.3%. The equation derived is E, G or ν=A1C+A2Si+A3Ni+A4Cr +A5Cu +A6(1/T)+A0, where E, G and ν are Young's modulus, the shear modulus and Poisson's ratio, respectively. C, Si etc. are chemical elements and T is the tempering temperature. The effects of heat-to-heat variation, material specification and tempering temperature on the elastic moduli are expressed fairly well by the equations.