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| induction surface heat treatment (【技】利用电磁感应和交流电的趋肤效应，在交变磁场的作用下，产生涡流而使工件表面局部加热的热处理工艺。交流电的频率越高，电流的透人深度越小，表面加热的深度越小。感应加热的频率可分为高频、中频和工频三类。高、中频加热主要用于钢件的表面淬火，工频加热用于穿透加热。主要优点是在表面层内奥氏体晶粒细小。对同样材料其硬度比普通炉中加热淬火硬度高，耐磨性也高；表面淬火除提高表面层本身的强度外，由于在表面层形成很大的残余压应力从而提高了钢件的疲劳强度。); surface heat treatment with induction heat | |||
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