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采用碳弧堆焊和激光熔覆法将Fe-05合金粉块分别熔覆在Q235钢基体表面。分析了涂层的显微组织和物相组成。测试了涂层的显微硬度和磨损失重。研究了熔覆工艺对涂层组织、硬度及耐磨性的影响。结果表明,碳弧堆焊和激光熔覆涂层的显微组织为黑色基体相上分布着白色的物相。其中黑色物相为基体α-(Fe,Cr)固溶体,白色物相主要为(Fe,Cr)_7C_3、Cr_(23)C_6、Cr_7C_3、Fe_2B、Fe_3B、Cr_3C_2、CrFeB及Ni_3Si。碳弧堆焊和激光熔覆涂层中均有裂纹产生,裂纹类型均为穿晶裂纹。激光熔覆涂层的显微硬度高于碳弧堆焊层,平均显微硬度约为989 HV。激光熔覆涂层的耐磨性高于碳弧堆焊涂层。
The Fe-05 alloy powders were respectively cladded on the surface of Q235 steel by carbon arc surfacing and laser cladding. The microstructure and phase composition of the coating were analyzed. The coating was tested for microhardness and wear loss. The effect of cladding technology on the microstructure, hardness and wear resistance of the coating was studied. The results show that the microstructure of the carbon arc welding and laser cladding coatings is white phase on the black matrix phase. The black phase is the solid solution of α- (Fe, Cr) and the white phase is mainly composed of (Fe, Cr) _7C_3, Cr_ (23) C_6, Cr_7C_3, Fe_2B, Fe_3B, Cr_3C_2, CrFeB and Ni_3Si. Cracks occur in the carbon arc surfacing and laser cladding coatings, and the crack types are all transcrystalline cracks. The laser cladding coating has a higher microhardness than the carbon arc surfacing layer with an average microhardness of about 989 HV. Laser cladding coatings have higher wear resistance than carbon arc surfacing coatings.