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用自制的低、中强度脉冲磁场(25—100KA/m)热处理设备对高速钢、轴承钢和弹簧钢的回火进行系统研究。发现,高速钢在脉冲磁场中回火可显著加速二次硬化过程,促进残余奥化体转变使回火时间缩短一倍以上。经x射线和电镜分析指出: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;轴承钢经脉冲磁场回火可使残余奥氏体量显著减小并使内应力大大降低从而可能取代精密零件的冷处理工艺;弹簧经脉冲磁场热强压处理,可使弹簧的松驰能力和稳定性大大提高,为生产高性能弹簧开辟了新的途径。
The tempering of high-speed steel, bearing steel and spring steel was systematically studied with homemade low and medium intensity pulsed magnetic field (25-100KA / m) heat treatment equipment. It is found that the tempering of high speed steel in pulsed magnetic field can accelerate the secondary hardening process significantly and promote the transformation of residual austenite to shorten the tempering time more than one time. The results of X-ray and electron microscopy show that the tempering of the pulsed magnetic field not only makes the precipitation of the alloy carbides in the martensite more uniform, but also increases the squareness of the martensite obviously, which in turn gives the high hardness and red Hard; bearing steel by the pulse magnetic field tempering can significantly reduce the amount of retained austenite and greatly reduce the internal stress and thus may replace the precision parts of the cold treatment process; spring by the magnetic pulse magnetic field hot pressure treatment, the spring relaxation capacity and The stability is greatly improved, opening up new avenues for the production of high-performance springs.