用表面磁光克尔效应测量铁磁材料的磁滞回线，并求得在饱和状态下的克尔旋转角。
Hysteresis loop of ferromagnetic materials are measured by using surface magneto-optic Kerr effect, and the Kerr rotation Angle is obtained.
试验表明：干切削状态下金属软化效应占主导地位，湿切削可获得更好的表面粗糙度，切削液在刀具磨损后期开始发挥作用。
The results show that the metal soften is dominant in dry turning process, a good surface can be acquired in wet turning, and the cutting fluid takes an effective effect at the end of tool wear.
试验表明：干切削状态下金属软化效应占主导地位，湿切削可获得更好的表面粗糙度，切削液在刀具磨损后期开始发挥作用。
The results show that the metal soften is dominant in dry turning process, a good surface can be acquired in wet turning, and the cutting fluid takes an effective effect at the end of tool wear.
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