中文摘要：

本文提出在离心铸造过程中施加脉冲电磁场，目的在于改善传统离心铸造容易造成元素和碳化物偏析的问题。高速钢中主要元素的设计含量为：1．5％～2．5％C，4．0～6．0％V，4．0％～6．0％W，1．5％～4．5％Mo，2．0％～4．0％Cr和0．04％～0．18％Zr.对脉冲电磁场主要参数进行调控和优化，脉冲磁场频率分别设定为1、2、4、6、8、10Hz六个水平，对应铸型中心磁场的峰值强度范围为0．2—5T，经淬火和回火热处理后进行轧辊中元素含量和力学性能测试，并用方差来表征轧辊工作层径向方向元素含量波动及偏析情况。研究结果显示，在离心铸造过程中施加电磁场后，能起到抑制合金元素和碳化物偏析的作用，与未加磁场相比，硬度、抗拉强度、抗弯强度和冲击韧性等常规力学性能约提高10％。

英文摘要：

Pulse electromagnetic field is imposed during the centrifugal casting high speed steel to solve the segregation of elements and carbide. The main components of elements in high speed steel are designed as 1.5% - 2.5% C, 4.0-6.0% V, 4.0% -6.0% W, 1.5% -4.5% Mo, 2.0% -4.0% Cr and 0.04% -0.18% Zr. The frequencies of pulse electromagnetic fields were set at 1,2,4,6,8 and 10Hz levels separately. The correspond- ing magnetic induced intensities of mould center were 0.2 - 5T. The actual elemental components were analyzed u- sing Atomic Emission Spectrometer. During data processing parameter of variance was used to characterize the fluc- tuation and segregation of elements and carbides. After heat treatment of quenching and tempering several mechani- cal properties of materials were tested. The results show that the fluctuation and segregation have been inhibited af- ter using pulse electromagnetic filed. The comprehensive mechanical properties are enhanced obviously, which in- clude hardness, tensile strength, bending strength and impact toughness. The average increase amplification is about 10% compared to that without using pulse electromagnetic field.