Different weight ratio of titanium, zirconium, WC and Fe-based alloy powders were mixed, and cladded onto a medium carbon steel substrate using a 3kW continuous wave CO2 laser, aiming at producing Ceramic particles- reinforced metal matrix composites (MMCs) layers. The microstructures of the layers are typical hypoeutectic, and the major phases are Ni3Si2, TiSi2, Fe3C, FeNi, MC, Fe7Mo3, Fe3B, γ(residual austenite) and M(martensite). The microstructure morphologies of MMCs layers are dendrites/cells. The MC-type reinforcements are in situ synthesis Carbides which main compositions consist of transition elements Zr, Ti, W. The MC-type particles distributed within dendrite and interdendritic regions with different volume fractions for single and overlapping clad layers. The MMCs layers are dense and free of cracks with a good metallurgical bonding between the layer and substrate. The addition ratio of WC in the mixtures has the remarkable effect on the microhardness of clad layers.
Metal matrix composites (MMCs) layers reinforced by in situ carbide particles were formed by laser cladding using preplaced (2.4%Zr+1.2%Ti+15%WC)/FeCSiB alloy powders on a medium carbon steel matrix. The microstructures of cladded layers, composition and distribution of in situ particles in the cladded layers were observed with optical microscopy (NEOPHOT), scanning electron microscopy (OPTION CSM-950, KYKY2000) and metallographic microstructure computer analysis system. HX-200 micro-Vickers was used to examine the cladded layer microhardness. The microstructure characteristics of MMCs layers are typical hypoeutectic which y austenite dendrites distributed on the FeCSiB quaternary eutectic substrate. The energy dispersive spectroscopy (EDS) analysis shows the reinforcements are in situ synthesis carbides which compositions consist of main transition elements Zr, Ti, w and carbon. The compound carbide particles distributed within dendrite and interdendritic regions with 3.6— 5.8% volume fractions. The martensite transformation went with the rapid cooling processes also. The MMCs layers are dense and free of cracks with a good metallurgical bonding between the layer and matrix. The microhardness values across layer cross section vary between HV0.2 8OO—HV0.2 1000.
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