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利用正交实验研究了铜、铬和锰含量对粉末冶金Fe-C-Cu-Cr-Mn材料烧结后组织和性能的影响。材料经冷压后于1135℃采用网带烧结炉烧结,对烧结后的材料进行硬度、抗拉强度、冲击韧性测试和显微组织观察。结果表明:铜对硬度和抗拉强度的影响最大、铬锰次之;锰对伸长率和冲击韧性的影响最大、铜铬次之;材料烧结后的显微组织为铁素体、珠光体和孔隙。铜、铬、锰含量分别在1%~3%、0~1.2%、0.3%~1.2%变化时,Fe-0.8C-3Cu-1.2Cr-0.3Mn的综合性能最好,其硬度为56.9 HRA,抗拉强度612.5MPa,伸长率为1.8%,冲击韧性7.9 J/cm2。
The effects of copper, chromium and manganese content on the microstructure and properties of powder metallurgy Fe-C-Cu-Cr-Mn sintered materials were investigated by orthogonal experiments. The material was cold pressed and sintered at 1135 ° C using a mesh belt sintering furnace to test the hardness, tensile strength, impact toughness and microstructure of the sintered material. The results show that copper has the strongest influence on hardness and tensile strength, followed by chromium and manganese. Manganese has the strongest influence on the elongation and impact toughness, followed by copper and chromium. The microstructure after sintering is ferrite, pearlite And pores. The comprehensive properties of Fe-0.8C-3Cu-1.2Cr-0.3Mn were the best when the contents of Cu, Cr and Mn were 1% -3%, 0-1.2% and 0.3% -1.2% , Tensile strength of 612.5MPa, elongation of 1.8%, impact toughness of 7.9 J / cm2.