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文中阐述该车间大型钢球热处理后产生大量屈氏体,深达0.30～0.40毫米,有的最深达到0.50毫米。其产生原因有二:1.钢球在冷却过程中,表面上产生气泡,使球与水隔开,降低冷却速度,从而产生屈氏体;2.球在圆盘淬火机中淬火,球与淬火机相对静止,与淬火机接触部分的冷却速度低于与水接触的冷却速度,从而产生屈氏体。消除的方法是:1.增加淬火介质中苏打的含量,以提高爆破气泡的能力;2.使淬火介质振动,从而使球表面的气泡产生后马上破裂,同时使球本身运动,不至于和淬火机相对静止。并对圆盘淬火机进行改进,增加了一个喷头,强制圆盘中的水振动。
In this paper, a large amount of troostite is produced after heat treatment of the large steel balls in the workshop, with a depth of 0.30-0.40 mm, and some deepest reaching 0.50 mm. The resulting two reasons: 1. Ball in the cooling process, the surface bubbles, the ball separated from the water, reducing the cooling rate, resulting in troostite body; 2. Ball hardened in the disc hardened ball and Quenching machine is relatively static, and quenching machine contact part of the cooling rate lower than the contact with water cooling rate, resulting in troostite. Elimination of the method is: 1. To increase the content of soda in the quenching medium in order to improve the ability of blasting bubbles; 2. The quenching medium vibration, so that the bubble surface of the ball immediately after the rupture of the ball, at the same time make the ball itself, not quenching and quenching Machine is relatively still. And to improve the disc hardened machine, an increase of a nozzle, forced water disc vibration.