粉末热锻双层材料凸轮的显微组织与力学性能

Microstructure and mechanical properties of powder metallurgy forging bilayer cam

以Fe–2Cu–1C基粉为凸轮内层材料,并以此基粉为原料加入Cr、Mo、Si等合金元素,作为凸轮外层材料,采用粉末锻造工艺制备双层材料凸轮,研究合金元素和锻造工艺对凸轮显微组织和力学性能的影响。实验结果表明:以Fe–2Cu–1C–1.5Cr–0.85Mo粉体作为外层材料,采用1050℃热锻的凸轮在密度7.56 g·cm–3时,抗弯强度、硬度和摩擦系数分别为1400 MPa、HRB 100和0.35;锻态组织为马氏体、贝氏体、屈氏体、合金块的混合组织。

Fe-2Cu-IC base powder was used as the inner layer material of cam, and adding Cr, Mo, and Si alloy elements in the base powder was used as the outer material of cam. The effects of alloying elements and forging process on microstructure and mechanical properties of bilayer cam manufactured by powder metallurgy forging were studied in this paper. The experimental results show that, the flexural strength, hardness, and friction coefficient of the forging sample used Fe-2Cu-lC-1.5Cr-0.85Mo as the outer layer material are 1400 MPa, HRB 100 and 0.35, respectively, and the forged structure is a mixed structure of martensite, bainite, troostite, and alloy block.