繰返し温度サイクルによるオーステナイト粒径の変化

概要

論文の詳細を見る
The effects of number of temperature cycles, heating-cooling rate and applied stress on the austenite grain size were studied in SCM415 steel. (1) The austenite grain size of specimens subjected to temperature cycling approaches almost a constant value regardless of the initial grain size. However, the effect of applied stress (4 kgf/mm^2) on the final austenite grain size is hardly observed. (2) The initial grain size of 13μm of the specimens tends to become the fine austenite grain size of 5μm after three temperature cycles through austenite ⇄ ferrite+bainite transformation. This value of grain size is the same as that attained through austenite ⇄ martensite transformation. (3) The austenite grain size becomes smaller in the case of the larger heating or cooling rate. The effect of cooling rate on grain refinement is larger than that of heating rate. (4) In the case of the large initial grain size, the austenite grain size tends to become smaller after one cycle. In the case of the small initial grain size, the austenite grain size tends to become larger during austenization. Therefore the austenite grain size approaches almost a constant value through the repeated temperature cycling.
社団法人日本鉄鋼協会の論文
1986-08-01