Thermodynamic modeling and experimental study on the microstructure of laser clad Ni–base alloy coatings on 45 steel


Ni–base alloy coatings were fabricated on 45 steel by laser cladding using a CW-CO2 laser system. The microstructure of the coatings was analyzed using optical microscope (OM), scanning electronic microscope (SEM), and x-ray diffractometer (XRD). The phase fractions, phase compositions, and solidification process in the coatings were calculated using Thermo-Calc software and compared with experimental results. The results show that a dense crack- and porous-free coating with good metallurgical bond is obtained under optimal process parameters. The coatings can be divided into three regions: clad zone (CZ), bonding zone, and heat-affected zone of the substrate. The CZ consists of γ-Ni, M7C3, CrB, and Ni3B phases. Based on the calculated results, the solidification process and reaction scheme in the coatings were discussed. The calculated results obtained from Thermo-Calc software agree with the experimental data well. It is beneficial to the coating design for a desirable microstructure and mechanical properties.

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The authors would like to thank the financial support provided by Tianjin Research Program of Application Foundation and Advanced Technology (Grant No. 11JCZDJC21400) and the Ph.D. Programs Foundation of Ministry of Education of China (Grant No. 20091201110002).

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Correspondence to Yiwen Lei.

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Lei, Y., Sun, R. & Tang, Y. Thermodynamic modeling and experimental study on the microstructure of laser clad Ni–base alloy coatings on 45 steel. Journal of Materials Research 28, 1189–1195 (2013).

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