Microstructure and Wear Resistance of in situ NbC Particles Reinforced Ni-based Alloy Composite Coating by Laser Cladding

武汉理工大学学报-材料科学版(英文版), 2012, 27(2): 231-237. doi: 10.1007/s11595-012-0443-1

^1, , ^2, , ^3, , ^4,

1.School of Materials Science and Engineering, Tongji University, Shanghai 200092, China;School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China;School of Medical Technology and Engineering, Henan University of Science and Technology, Luoyang 471003, China

2.School of Materials Science and Engineering, Tongji University, Shanghai 200092, China

3.School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China

4.School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China

Microstructure and Wear Resistance of in situ NbC Particles Reinforced Ni-based Alloy Composite Coating by Laser Cladding

DONG Gang ^1, , YAN Biao ^2, , DENG Qilin ^3, , YU Ting ^4,

2.School of Materials Science and Engineering, Tongji University, Shanghai 200092, China

3.School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China

4.School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai 200030, China

Keywords： in situ synthesis

The in situ synthesized NbC particles reinforced Ni-based alloy composite coating was produced by laser cladding a precursor mixture of Ni-based alloy powder,graphite and niobium powders on a steel substrate.The microstructure,phase composition and wear property of the composite coating were investigated by means of scanning electron microscopy (SEM),X-ray diffraction (XRD) and dry sliding wear test.The experiment results show that the composite coating is homogeneous and free from cracks,and about 0.8 mm thick.The microstructure of the composite coating is mainly composed of NbC particles,CrB type chromium borides,γ-Ni primary dendrites,and interdendritic eutectics.CrB phases often nucleate and grow on the surface of NbC particles or in their close vicinity.NbC particles are formed via in situ reaction between niobium and graphite in the molten pool during the laser cladding process and they are commonly precipitated in three kinds of morphologies,such as quadrangle,cluster,and flower-like shape.Compared with the pure Nibased alloy coating,the microhardness of the composite coating is increased about 38％,giving a high average hardness of HV0.21000,and the wear rate of the composite coating is decreased by about 32％,respectively.These are attributed to the presence of in situ synthesized NbC particles and their well distribution in the coating.

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材料期刊网

Microstructure and Wear Resistance of in situ NbC Particles Reinforced Ni-based Alloy Composite Coating by Laser Cladding

参考文献