The Investigation On The Microstructure And Properties Of In-situ Synthesis TiC Particulate Reinforce Ni60A Composite Coatings By Argon Arc Cladding

Wear is caused material loss and energy consumption an important reason for the failure of three main mechanical form (wear and tear, corrosion and fatigue) one. Therefore, to make wear resistance coatings on components made of ordinary material by using advanced surface strength technology are always a preferred choice, especially those with poor wear resistance. It not only improves the reliability and lifespan of components markedly, reduces the cost of maintenance and replacing, but also decreases the using of material and energy, so contribute to conservation of environment.In situ particle reinforced metal matrix composites has become one of interesting topics in recent years. In this dissertation, Ni-based composite coating reinforced by TiC particle was prepared on the surface of 16Mn steel by means of argon arc cladding technique with the pre-alloyed powders of Ni60A,Ti and C.Microstructure of composite layer was investigated with the help of optical microscope, scanning electronic microscope and X-ray diffraction meter. The argon arc cladding of technological parameters on the quantity of cladding layer is studied. The abrasive wear resistance of in-situ TiCp/Ni60A composites has been studied under condition of dry sliding friction by the wear tester of MMS-2A.The results of these studies as follow: A great quantity of fine TiC particle in-situ synthesized is homogeneous distribution in matrix. The interface between TiC and matrix is un-reaction product has been found. Excellent bonding between the coating and the 16Mn steel substrate and the coating is uniform, continuous and almost defect-free and the particles are dispersively distributed in the clad coating. The argon arc clad composite coating has high hardness. Under loads of 200 Newton, the 30%(Ti+C)p/Ni60A matrix composites have is 24 times that of 16Mn steel. With the increase of percentage composition of (Ti+C) carbide argon arc clad coating, the resistance of abrasive wear is improved. The spalling of TiC particles is avoided during the wear test. By analyzing the wear trace and wear debris, the wear mechanism and the reason of their high wear-resistance are measured.