Abstract
The effect of heating rate on heat treatment of 13% Cr stainless steel was studied by applying two kinds of heating rates, 3000°C/s and 10°C/mn.
The recrystallization temperature in rapid heating was higher by about 100°C than in slow heating. The grain size immediately after recrystallization was smaller in rapid heating than in slow heating. X-ray photographs, which was taken at the recrystallized specimens, showed that the rapidly heated specimen had a more random directionality than the slowly heated specimen.
A1 transformation occured at about 900°C in slow heating and at about 950°C in rapid heating. Martensite, which was formed by quenching from the temperature higher than A1 point, was finer in rapidly heated specimen, than in slowly heated specimens.
