isothermal annealing and spheroidizing annealing difference between

Vacuum annealing furnace isothermal annealing and spheroidizing annealing difference between

For the difference between isothermal annealing and spheroidizing annealing of vacuum annealing furnace, the manufacturer of vacuum heat treatment furnace will share with you:

First, one is complete annealing, the other is incomplete annealing.

Second, the heating temperature of isothermal annealing is the same as that of complete annealing, but the cooling mode is different. Isothermal annealing is to divide the temperature into two parts to keep warm during annealing to obtain lamellar or granular pearlite. At the beginning, it cools to a certain temperature below A1 at a faster speed. After holding for a certain period of time, austenite transforms into pearlite structure, and then air-cooled. For some alloy steels with stable austenite, isothermal annealing can greatly shorten the annealing period. Spheroidizing annealing is an annealing process to spheroidize the carbides in steel or to obtain "spherical pearlite".

Third, although there is a relationship between isothermal annealing and spheroidizing annealing, the purpose of annealing is not the same.