Effect of the Normalized Structure in Medium Carbon Steel on Mechanical Properties and Ultrasonic Transmissibity

Abstract

With the aid of a lot of materials picked up at the production plant as samples for microphotography, an investigation was made to try to study statistically the relation between the microstructure and the mechanical properties (ductility and toughness) to clarify the effect of acicular pearlitic structure recognized in normalized medium carbon steel on its mechanical properties. The results were summarized that the mechanical property varied according to the microstructure and the microstructure, in the course of becoming coarse, made both its ductility and toughness decreased and the standard deviation of the impact value increased.
At the same time the ultrasonic transmissibility was investigated on various microstructures made by the laboratory treatment by which the relation between the microstructure and the apparent ultrasonic attenuation coefficient became ascertained.