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由于冷却不当导致热处理失败的事例是很多的,然而要改善冷却过程,除需研制和采用更为理想的冷却介质外,还要充分掌握冷却过程中的相变特点。为了获得一定的组织和性能,在选取冷却方式时,多半是参照等温转变曲线。而实际热处理中的冷却,大都是连续冷却。只不过普通的淬火、正火和退火是在连续冷却过程中进行相变的,而等温淬火和等温退火等则是在连续冷却后,才在恒温下发生相变。连续冷却相变和等温相变不同,但在相变前
However, there are many cases of failure of heat treatment due to improper cooling. However, in order to improve the cooling process, in addition to the development and application of a more desirable cooling medium, the phase transition during cooling must be fully mastered. In order to obtain a certain degree of organization and performance, the choice of cooling method, mostly based on the isothermal transformation curve. The actual heat treatment in the cooling, mostly continuous cooling. However, ordinary quenching, normalizing and annealing are carried out in the continuous cooling process of phase change, and isothermal quenching and isothermal annealing, etc. are in the continuous cooling, the phase change occurs only at a constant temperature. Continuous cooling phase transition and isothermal phase change, but before the phase change