国外汽车齿轮钢晶粒度的研究

Study on the Grain Size of Auto Gear Steel Abroad

本文通过试验数据阐明了晶粒度对汽车齿轮钢的脆断抗力、冲击韧性及疲劳性能的影响。并进一步说明粗晶粒钢不仅降低齿轮的使用寿命,而且还使齿轮热处理变形明显增大。使齿轮啮合精度下降,噪音增加,并造成非正常磨损。因此,必须严格控制其晶粒度,使之为6级以上。本文还叙述了采用冶炼、轧制、锻造、热处理等手段来控制汽车齿轮钢晶粒度的有效方法与措施。

In this paper the influences of the grain size on the some main properties of automobile gear steel are described. The coarse grain steel not only decreases the life time of gears, but also increases the deformation in heat-treating, so that it decreases the meshing precision of gears, increases noise and makes the abnormal wear. So the grain size of the gear steed must be maitained above No 6 grade. The effective methods which the grain size of automobile gear steel must be controlled by the working processes are also mentioed.