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

Published online by Cambridge University Press:  12 April 2013

Yiwen Lei ,
Ronglu Sun  and
Ying Tang
Yiwen Lei*
Affiliation:
Department of Materials Engineering, School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China; and Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology; Tianjin 300387, China
Ronglu Sun
Affiliation:
Department of Materials Engineering, School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
Ying Tang
Affiliation:
Department of Materials Engineering, School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
*
a)Address all correspondence to this author. e-mail: leiyiwen@163.com
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Abstract

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.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 9 , 14 May 2013 , pp. 1189 - 1195
Copyright
Copyright © Materials Research Society 2013 

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