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为便于切削加工及获得良好的组织,GCr15钢锻件一般需进行球化退火.在生产中广泛采用的是稍高于Ac_1温度加热的球化工艺,因为当温度超过Ac_1不多时,钢的组织是奥氏体及大量未溶解的碳化物,这些碳化物是冷却时的结晶核心,保持一段时间后,再进行适当的冷却就能得到满意的球化质量,实践反复证明:球化退火质量的优劣主要取决于在设备中的加热温度.
GCr15 steel forgings are generally ball-annealed to facilitate cutting and obtain good microstructure, widely used in the production of the ball is slightly higher than the Ac_1 heating balling process, because when the temperature exceeds Ac_1 is not much, the steel is Austenite and a large number of undissolved carbides, these carbides are the cooling of the crystallization of the core, to maintain a period of time, and then appropriate cooling can be satisfied with the quality of the ball, practice has repeatedly proved: excellent ball annealing quality The bad depends mainly on the heating temperature in the equipment.