真空烧结—热锻高碳高钒模具钢CPM10V的组织和力学性能

Microstructure and Mechanical Properties of High Carbon and High Vanadium Die Steel CPM10V Made by Vacuum Sintering—Hot Forging

用金相显微镜观察了由相对密度为８１％、８５％、９３％、９８％的４种ＣＰＭ１０Ｖ烧结体热锻成的材料经淬火、回火后的组织，测量了这些材料经热处理后的硬度、抗弯强度。结果表明，经相同的温度淬火、回火后，不同相对密度的烧结体的锻材硬度大致相同。相对密度为８１％、８５％的烧结体的锻材，碳化物细小且尺寸和分布均匀，但抗弯强度较低；相对密度为９３％、９８％的烧结体的锻材碳化物已发生长大，且出现了尺寸相差较大的两类碳化物，但抗弯强度较高；而且相对密度为９３％的烧结体的锻材抗弯强度大于相对密度为９８％的烧结体锻材。

The microstructure of materials made by forging 81 %TD, 85 %TD, 93 %TD and 98 %TD CPM10V sintering bodies has been observed with optical microscope after quenching and tempering. The hardness and bend strength of these heat treated materials has been measured. It is shown that the hardness values of those materials made by forging the sintering bodies with different relative densities are almost equal when those materials are quenched and tempered in the same temperature. The carbides in the materials made by forging 81 %TD and 85 %TD CPM10V sintering bodies are very fine and uniform in size and distribution, but the bend strength of the materials is very low. Carbides coarsen and two kinds of carbides with quite different size appear in the materials made by forging 93 %TD and 98 %TD CPM10V sintering bodies and the bend strength of the materials are higher. The bend strength of the material made by 93 %TD CPM10V sintering body is higher than that of the material made by 98 %TD CPM10V sintering body.