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Acta Metall Sin  2017, Vol. 53 Issue (4): 472-478    DOI: 10.11900/0412.1961.2016.00288
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Microstructure and Properties of TiC/Co-Based Alloyby Laser Cladding on the Surface of NodularGraphite Cast Iron
Wenhui TONG1,Zilong ZHAO1,Xinyuan ZHANG1,Jie WANG1,Xuming GUO1,Xinhua DUAN2,Yu LIU2
1 School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China
2 Shenyang Dalu Laser Complete Equipment Co. Ltd., Shenyang 110136, China
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Ductile cast iron, with excellent comprehensive mechanical properties, is widely used manufacturing traction wheel, crankshaft, cylinder liner, etc.. However, in the harsh environment, it often leads to failure due to the serious surface wear. At present, the repair methods for the damaged parts are mainly thermal spraying, deposit welding and other methods, but the properties and application effect of the repaired parts need to be improved. In order to significantly improve the surface properties of ductile cast iron, the 30%TiC/Co-based alloy cladding layer prepared by laser cladding is put forward on the surface of ductile cast iron in this work. The microstructure, composition, phase, hardness of the laser cladding layer are investigated and analyzed by OM, SEM, EDS, XRD, TEM and MHV2000 digital microhardness tester. The results show that the cladding layer can be integrated metallurgically with the nodular graphite cast iron matrix. The cladding layer consists of a surface layer of dendritic crystals and an internal cellular crystal. The primary phase of TiC from the melt is precipitated in situ during the solidification after laser heating. The amount of the primary TiC is gradually increased from the inner layer to the surface layer. Meanwhile, the undissolved TiC is dispersively distributed among the dendrites. The laser cladding layer is mainly composed of γ-Co, TiC, CoCx and a small amount of Cr7C3. The hardness maximum of the cladding layer is 1278.8 HV0.2, up to 5 times more than the hardness of the nodular graphite cast iron matrix.

Key words:  laser cladding      Co-based alloy      TiC      microstructure      hardness     
Received:  07 July 2016     

Cite this article: 

Wenhui TONG,Zilong ZHAO,Xinyuan ZHANG,Jie WANG,Xuming GUO,Xinhua DUAN,Yu LIU. Microstructure and Properties of TiC/Co-Based Alloyby Laser Cladding on the Surface of NodularGraphite Cast Iron. Acta Metall Sin, 2017, 53(4): 472-478.

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Fig.1  Macroscopic morphology (a) and microstructure (b) of the cross section of laser cladding layer (CZ—cladding zone, BZ—bonded zone, HAZ—heat affected zone, SUB—substrate)
Fig.2  Microstructures of the 30%TiC/Co-based alloy laser cladding layer on the surface of ductile cast iron
(a) near surface (b) middle zone of layer (c) combining zone (d) HAZ
Fig.3  Scanning direction (a) and element distributions of Ti (b) and C (c) of cross section of cladding layer
Fig.4  Cross sectional SEM image of cladding layer (a) and EDS analyses of points I (b) and II (c) in Fig.4a
Fig.5  XRD spectrum of the laser cladding layer of 30%TiC/Co-based alloy
Fig.6  TEM images and SAED patterns (insets) of the enhanced phase in the laser cladding layer of 30%TiC/Co-based alloy (a) TiC (b) γ-Co (c) CoCx
Fig.7  Microhardness distribution of the cross section of the cladding layer
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