用自制的低、中强度脉冲磁场(25—100kA/m)热处理设备对高速钢的回火进行了系统的研究。发现,高速钢在脉冲磁场中回火可显著加速二次硬化过程,促进残余奥氏体转变,使回火时间缩短一半以上。X射线和电镜分析表明:脉冲磁场回火不仅使马氏体中合金碳化物的析出更加均匀弥散,而且使马氏体的正方度明显升高,从而赋于高速钢更高的硬度和红硬性。并经生产实际考核证明,经脉冲磁场回火的高速钢中心钻、丝锥和螺帽孔冲头的服役寿命平均提高40—140％。
Using a pulse magnetic field heat treatment equipment with low me-dium intensity made by ourself, the tempering process of high speed steel W6Mo5Cr4V2 was inverstigated. It was found that the secondary hardening process andthe transformation of retained austenite for the steel were accelerated by the pulsemagnetic field, and the tempering period could reduce to half of original. It wasshown by the analyses of X-ray and electronmicroscope that the precipitation ofcarbides becomes more homogeneous and diffuse, and the tetragonality of martensiteincreases obviousely, that causes the hardness and red-hardness of the steel increas-ing. It was comfirmed by practice that undergone tempering in pulse magneticfield, the service life of centre bits, small screw taps and punches for nuts increasedby 0.4 to 1.4 times.
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