Q235钢表面等离子熔覆碳化钨增强铁基合金层的组织和硬度卢

Microstructure and Hardness of Fe-Based Alloy Coating Reinforced with WC on Q235 Steel Surface by Plasma Cladding

摘要: 采用等离子弧熔覆技术在Q235钢基体上制备了镍包碳化钨增强(质量分数为50%)的铁基合金层;采用SEM、EDS和XRD等研究了合金层的组织,利用显微硬度计测试了合金层的显微硬度分布.结果表明:Q235钢表面合金层厚度可达2.6 mm,合金层中无裂纹、气孔等缺陷;合金层中WC颗粒部分溶解于铁基合金中,WC与合金层界面形成厚达数微米的反应层,其组织主要以γ-Fe为基体,其上分布着Cr23C6、Fe3W3C、WC和Ni3B等强化相;合金层的显微硬度可达700~1 100 HV.

Abstract: By plasma cladding technology a Fe-based alloy coating reinforced with 50wt% Ni coated WC was prepared on the substrate of Q235 steel.The microstructure of the coating was investigated by SEM,EDS and XRD.The microhardness distribution of the coating was tested by microhardness tester.The results show that the coating was about 2.6 mm in thickness without cracks and gas pores.The WC particles in the alloy coating were partly melted into the Fe-based alloy,and the reaction layer with the thickness of several microns was formed at the interface between WC and coating.The microstructure of the reaction layer was mainly composed of γ-Fe matrix with the strengthening phases of Cr23C6,Fe3W3C,WC and Ni3B.The microhardness of the coating could reach 700-1 100 HV.