Microstructure and properties of additional and in situ synthesized WC particle reinforced iron-based coatings prepared by plasma cladding

doi:10.13251/j.issn.0254-6051.2022.02.036

Abstract

Abstract: Additional and in situ synthesized WC particle reinforced iron-based composite coatings were fabricated on Q235 steel substrate by plasma cladding technique with raw material of iron based alloy powder, nickel-coated graphite, tungsten iron powder, and cast tungsten carbide. The microstructure, phase composition, hardness and wear resistance were examined by SEM, XRD, hardness test and abrasive wear test, respectively. The results show that the coating with good metallurgical bonding to substrate can be obtained under optimal process parameters. Except for added WC particles, the coating has hard phases such as WC, W₂C, W₃C, Fe₃W₃C and Fe₂W₂C, which are in situ synthesized. With the increase of W content in the mixed powder except for added WC particles, the density of the alloy liquid in the molten pool increases, which can reduce the sinking of the additional WC particles. When the content of W reaches 15%, the added WC particles are evenly distributed in the coating, and there is no agglomeration of WC particles in the coating. And there are fine in situ synthesized WC particles around the additional WC particles, and the microhardness and wear resistance of the coating are significantly improved. The average microhardness of the coating with W content of 15% is capable of reaching about 1300 HV0.2, the wear resistance is 10 times that of the Q235 steel matrix.

Key words: plasma cladding, WC particle, additional and in situ synthesized, microstructure, microhardness, wear resistance

CLC Number:

Zhang Mengliang, Tang Wenbo, Li Baiqi, Wang Xiaosheng, Li Wenqiang, Wang Tengfei. Microstructure and properties of additional and in situ synthesized WC particle reinforced iron-based coatings prepared by plasma cladding[J]. Heat Treatment of Metals, 2022, 47(2): 200-204.

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