オーステナイト粒度の新測定法と繰返し加熱冷却によるオーステナイト粒界の変化

抄録

If the specimen of mild steel of which surface is polished as flatly as a mirror, is carburized with weak carburizer, the graphite is deposited along the grain boundary of austenite. Applying this phenomena, we found a new method of determining austenite grain size, called “graphite method”, which was simpler and speedier than other methods. And the transition of austenite grain boundary by heating and cooling through A₁ point was also observed.