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我厂生产的各类小模数齿轮,大都经过调质处理,以便改善和提高齿轮的机械性能。但由于实际操作不当,引起淬裂,经济上造成很大的损失。为了避免和减少这一缺陷,我们除对各工艺过程严格控制以外,更注重了马氏体相变温度(Ms)这一因素。我们知道,Ms表示马氏体开始转变温度。从C曲线(T·T·T)上可以看出,当以极快的冷却速度(大于临界淬火速度)将奥氏体过冷到Ms点以
I plant a variety of small modulus gear, mostly after quenching and tempering, in order to improve and improve the mechanical properties of gears. However, due to improper operation, causing quench cracking, resulting in great economic losses. In order to avoid and reduce this shortcoming, besides strictly controlling each process, we pay more attention to the factor of martensitic transformation temperature (Ms). We know, Ms said that the martensite began to change the temperature. It can be seen from the C-curve (T · T · T) that when the austenite is subcooled to the Ms point at an extremely fast cooling rate (greater than the critical quenching rate)