离心铸造高速钢复合轧辊的研究

Research on Centrifugal Casting High-speed Steel Composite Rolls

在实验室条件下研究了钒和稀土复合变质对高速钢的组织和性能的影响,测试了高速钢最终热处理后的碳化物类型和形态,以及硬度、抗拉强度和冲击韧度等力学性能。结果表明,采用0.4wt%稀土加1.2wt%V变质处理后,碳化物的形状、大小和分布改善较好,减少了元素在晶界处的偏析,大大增加了碳化物的数量和减小了碳化物尺寸。稀土加V变质能够提高热处理后的高速钢硬度,稀土加V变质的高速钢在抗拉强度和弹性模量方面都略优于稀土变质处理的高速钢,但二者差别较小。稀土和V变质都能显著提高高速钢的冲击韧度,其中V变质的作用更加明显。

The influences of compound modification with vanadium and rare earth on microstructure and performances of high speed steel were studied under laboratory conditions. The carbide type and morphology as well as hardness, tensile strength and impact toughness and other mechanical performance of high speed steel after the final heat treatment were tested. The results indicate that shape, size and distribution of carbides are better improved after the using 0.4wt% rare earth and 1.2wt% V modification. And grain boundary segregation of elements is reduced, which greatly increases the number of carbides and decreases carbide size. Rare earth plus V modification can improve the hardness of high-speed steel after heat treatment. The tensile strength and elastic modulus of high speed steel after rare earth plus V modification are slightly better than those of high speed steel with rare earth modification, but the difference is smaller. Rare earths and V modification can improve the impact toughness of high speed steel, and that V modification is more obvious.