钼包铁粉对Fe-2Cu-1Mo-0.8C合金显微组织、工艺性能和力学性能影响

Effects of Mo coated Fe powders on microstructure,processing performance and mechanical properties of sintered Fe-2Cu-1Mo-0.8C alloys

分别采用元素混合粉和钼包铁粉将钼元素引入到Fe-2Cu-1Mo-0.8C成形混合料中,经压制烧结后得到烧结体,考察了两种钼元素引入方式对粉末工艺性能及烧结体显微组织和力学性能的影响。结果表明,由钼包铁粉所制备的Fe-2Cu-1Mo-0.8C成形混合料松装密度和流动性都优于元素混合粉末,分别提高了0.22 g/cm^(3)和2.14 s/50 g。经800 MPa压力压制后,由钼包铁粉制备的压坯密度为7.29 g/cm^(3),于1150℃烧结90 min后得到烧结体的密度为7.26 g/cm^(3)。烧结体的显微组织以珠光体和铁素体为主,由钼包铁粉制备的烧结体组织更为致密,钼元素在烧结体中分布更均匀,其抗拉强度和硬度分别为533 MPa和98.2 HRB,由元素混合粉制备的烧结体的抗拉强度和硬度分别为501 MPa和93.5 HRB。

Fe-2 Cu-1 Mo-0.8 C powder mixtures were prepared by mechanical mixing with elemental mixed powders and Mo coated Fe powders as the source of Mo element respectively, then the sintered samples were obtained by pressing and sintering, and the processing properties of powder mixtures, the microstructure and mechanical properties of the sintered samples with two Mo element addition ways were investigated. The results show that compared with the elemental mixed powders, the apparent density and flowability of the Fe-2 Cu-1 Mo-0.8 C powder mixtures prepared with Mo coated Fe powders are improved by 0.22 g/cm^(3) and 2.14 s/50 g, respectively. After pressing at 800 MPa, the density of the green compacts is 7.29 g/cm^(3), and the density of the sintered samples after sintering at 1150 ℃ for 90 min is 7.26 g/cm^(3). The microstructure of the sintered samples is mainly composed of pearlite and ferrite. The microstructure of the sintered samples prepared with Mo coated Fe powders is denser, and the distribution of Mo elements in the sintered samples is more uniform, the tensile strength and hardness are 533 MPa and 98.2 HRB, respectively. The tensile strength and hardness of the sintered samples prepared with elemental mixed powders are 501 MPa and 93.5 HRB, respectively.