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为便于切削及获得良好的组织,GC_r15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:退火质量的优劣主要取决于在设备中的加热温度。
In order to facilitate cutting and obtain good organization, GC_r15 forgings generally need to be ball annealing. Widely used in the production of the ball is slightly higher than the AC1 temperature heating process, because when the temperature exceeds AC_1 when not much, the steel is austenite and a large number of undissolved carbides These carbides are cooling the crystallization of the core, Maintain a period of time, and then appropriate cooling can be satisfied with the quality of the ball, the practice has repeatedly proved: The pros and cons of annealing quality depends on the heating temperature in the device.