车刀用W_2C颗粒增强Fe基复合材料组织和性能分析
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摘要
利用直流电弧原位冶金技术制备W_2C颗粒增强Fe基复合材料。通过物相分析、显微组织观察和力学性能测试,研究车刀用W_2C颗粒增强Fe基复合材料的组织和力学性能。结果表明:复合材料的物相组成为WC、W_2C和(Fe,Ni),花状枝晶含有大量的C和W,是固溶了Cr的W_2C;Fe基固溶体与M_7C_3共同构成的菊状共晶结构。W_2C颗粒增强以后,复合材料的拉伸强度、屈服强度、伸长率分别为248.3 MPa、188.6 MPa和12.8%,硬度为61.8 HB。复合材料拉伸断口存在少量撕裂棱以及大量韧窝结构,呈现微孔聚集性断裂特征。
The W_2C particle reinforced Fe matrix composite material was prepared by using Dc arc in situ metallurgy technology. And the microstructure and mechanical performance analysis of W_2C particle reinforced Fe matrix composite materials were analyzed by phase, microstructure observation and mechanical performance test. Results show that the phases of composite material are composed of WC, W_2C and(Fe, Ni), the flower dendrite contains a large number of C and W, which is W_2C with Cr dissolving; Fe based solid solution and M_7C_3 constitute foliated eutectic structure. After the W_2C particle reinforcement, the tensile strength, yield strength, elongation of the composite material are 248.3 MPa, 188.6 MPa and 12.8,respectively, the hardness is 61.8 HB. A small number of torn edges and a large number of dimples appear in the tensile fracture of composite material, which present the microporous gathered fracture characteristic.
The W_2C particle reinforced Fe matrix composite material was prepared by using Dc arc in situ metallurgy technology. And the microstructure and mechanical performance analysis of W_2C particle reinforced Fe matrix composite materials were analyzed by phase, microstructure observation and mechanical performance test. Results show that the phases of composite material are composed of WC, W_2C and(Fe, Ni), the flower dendrite contains a large number of C and W, which is W_2C with Cr dissolving; Fe based solid solution and M_7C_3 constitute foliated eutectic structure. After the W_2C particle reinforcement, the tensile strength, yield strength, elongation of the composite material are 248.3 MPa, 188.6 MPa and 12.8,respectively, the hardness is 61.8 HB. A small number of torn edges and a large number of dimples appear in the tensile fracture of composite material, which present the microporous gathered fracture characteristic.
引文
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[3]杨全涛,袁有录.等离子弧喷焊WC颗粒增强Fe基梯度涂层的制备及组织分析[J].焊接技术,2014,45(6):16-19.
[4]李斌,刘宗德,陈勇,等.燃烧合成/准热等静压Ti C-Fe基复合材料耐磨损性能的研究[J].粉末冶金工业,2010,20(1):50-53.
[5]伏思静,王静.(Ti,V)C颗粒增强铁基复合材料显微组织的研究[J].热加工工艺,2007,36(22):30-33.
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