不銹鋼の熱処理における加熱速度の影響(I)
1958 年 44 巻 2 号 p. 136-142
詳細
1958 年 44 巻 2 号 p. 136-142
In ordr to investigate the effect of heating rate on the phenomena in the heat treatment of cold-rolled 18/8-stainless steel, two kinds of heating rates, i.e. 104°C/s and 10°C/mn were applied.
The temperature at which the specimen began to soften was far higher in rapid heating than in slow heating. This difference between both temperatures decreased with increasing. reduction of thickness of specimen.
The α phase which had been derived by cold rolling began to disappear at about 500°C in slow heating and at about 600°C in rapid heating. At the temperature higher than 800°C, the amount of α phase in rapidly heated specimen was less than that in slow-heated one.
Rapid heating brought about very fine grain size at the end of recrystallization.
Precipitation of carbides was noticed at the temperatures between 600°C and 900°C with slowly heated specimens, but in rapid heating the carbides did not precipitate at any temperature. The corrosion behaviors of the specimens corresponded well to the precipitation of carbides, thus the rapidly heated and softened specimens showed good corrosion-resistance compared with the slowly-heated specimens.
