磁场对离心铸造高碳高速钢组织和性能的影响

Influence of Magnetic Flux on Microstructure and Properties of High Carbon High Speed Steel Made by Centrifugal Casting

用自制的电磁离心铸造机,在离心机转速为960r/min,磁场强度分别为0.05、0.10、0.15、0.20T的条件下,制备了高碳高速钢,试验研究了不同磁场强度下的高碳高速钢的铸态组织和热处理后的组织与性能。结果表明:随着磁场强度的增加,高碳高速钢的铸态组织中角状、点状碳化物的分布逐渐趋于均匀、弥散,共晶碳化物呈现出先减少、变短,后增加、变长的趋势;热处理后组织中的共晶碳化物变细、变短,且在磁场强度为0.15T的试样中硬度、冲击韧度和耐磨性能达到最佳。

The high carbon high speed steel （HC-HSS） was made by self-made centrifugal casting machine with various magnetic flux density （0.05-0.20 T） and at the rotational speed 960 r/min. The influence of magnetic flux density of electromagnetic centrifugal casting machine on microstructure and properties of high carbon high speed steel （HC-HSS） was investigated. The results show that the angular, granular carbides of as-cast HC-HSS are well-distributed in the steel matrix and the eutectic carbides decreases first and then increases as the magnetic flux density increased. After heat treatment, the eutectic carbides become thin and short. The test specimen have high hardness, impact toughness and excellent relative wear resistance when the magnetic field strength reaches to 0. 15 T.