粉末活化烧结制备高性能铁基合金

将机械球磨后的预合金粉分别与雾化铁粉及羰基铁粉混合,通过真空烧结法制备Fe-3Mo-3Cr-1.2V-0.5Mn-2C铁基粉末冶金材料,研究机械球磨活化预合金粉以及羰基铁粉的加入对材料显微组织结构和力学性能的影响。结果表明:对预合金粉进行机械球磨活化有利于合金元素在雾化铁粉中的烧结扩散,可促进铁基粉末冶金材料的致密化;当采用高表面活性的羰基铁粉作为原料替代雾化铁粉时,能够使样品在低的烧结温度下获得更高的密度及力学性能。其中,在1120℃下烧结条件,铁基合金材料孔隙率较低,晶粒尺寸适中,样品密度为7.68 g/cm³,布氏硬度高达538,抗弯强度为1222 MPa。

High performance iron-based alloy fabricated by activated powder sintering

Mixing the mechanical milled pre-alloy with atomized iron and carbonyl iron,respectively,Fe-3Mo-3Cr-1.2V-0.5Mn-2C alloy was prepared by vacuum sintering.The microstructure and mechanical properties of the as-prepared samples by mechanically activated pre-alloy and carbonyl iron were studied.The results show that mechanically activated milling can effectively improve the diffusion of pre-alloy in atomized iron and densification of iron based powder metallurgy materials.With the highly surface-activated carbonyl iron powder as raw material,higher density and mechanical properties can be obtained in low sintering temperature.The iron-based powder metallurgy sample sintered at 1120℃has low porosity and medium grain size.The density,brinell hardness and bending strength are 7.68 g/cm³,538 and 1222 MPa,respectively.