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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%。
In this paper, the application of pulsed electromagnetic field in centrifugal casting is proposed in order to improve the problem of segregation of elements and carbides easily caused by traditional centrifugal casting. The designed contents of main elements in HSS are 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 main parameters of the pulsed electromagnetic field are regulated and optimized. The pulsed magnetic field frequencies are set at six levels of 1, 2, 4, 6, 8 and 10 Hz respectively. The peak intensity corresponding to the central magnetic field of the mold is 0.2-5T. After the heat treatment, the element content and mechanical properties of the roll were tested, and the variation of the element content in the working layer of the roll was used to characterize the fluctuation of the element content and segregation. The results show that the application of electromagnetic field in the centrifugal casting process can inhibit alloying elements and carbide segregation. Compared with the unmagnetised magnetic field, the conventional mechanical properties such as hardness, tensile strength, flexural strength and impact toughness Increase by 10%.