A STUDY ON THE METHOD FOR REVEALING THE AUSTENITE GRAIN SIZE IN STEEL

Abstract

As the revealing method of austenite grain size of steel, usually, various technique such as carburizing method has been used, although these are not sufficient because of unquickness for determination, complex procedure, and difficulties caused by the influence of alloying elements.
Authors studied on methods of carburizing-, graphite-, double quenching-, quenching-and oxidizing and found the metal diffusion method being easy for determination of grain size, and determined its application range.
On the metal diffusion method, the new technique using lead as diffused metal was devised. The authors were convinced that the grain size could be determined by this method without the influence of alloying elements on any steels.