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Characteristics and properties of cryomilling-induced columnar growth in NiCrAlY coatings on Ni-based superalloy by laser induction hybrid cladding

Published online by Cambridge University Press:  26 April 2016

Shengfeng Zhou ,
Jianbo Lei ,
Zheng Xiong ,
Jinbo Guo ,
Zhenjie Gu ,
Xiaoqin Dai ,
Chao Yan  and
Hongbo Pan
Shengfeng Zhou*
Affiliation:
School of Science, Laser Technology Institute, Tianjin Polytechnic University, Tianjin 300387, People's Republic of China
Jianbo Lei
Affiliation:
School of Science, Laser Technology Institute, Tianjin Polytechnic University, Tianjin 300387, People's Republic of China
Zheng Xiong
Affiliation:
School of Science, Naval University of Engineering, Wuhan, Hubei 430033, People's Republic of China
Jinbo Guo
Affiliation:
School of Science, Laser Technology Institute, Tianjin Polytechnic University, Tianjin 300387, People's Republic of China
Zhenjie Gu
Affiliation:
School of Science, Laser Technology Institute, Tianjin Polytechnic University, Tianjin 300387, People's Republic of China
Xiaoqin Dai
Affiliation:
School of Computer Science & Software Engineering, Tianjin Polytechnic University, Tianjin, 300387, People's Republic of China
Chao Yan
Affiliation:
School of Measuring and Optical Engineering, Nanchang Hangkong University, Nanchang, Jiangxi 330063, People's Republic of China
Hongbo Pan*
Affiliation:
School of Engineering Research institute, Anhui University of Technology, Ma'anshan, Anhui 243002, People's Republic of China
*
a) Address all correspondence to these authors. e-mail: [email protected]
b) e-mail: [email protected]
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Abstract

Cryomilling combined with laser induction hybrid cladding (LIHC) was adopted to produce NiCrAlY coatings on Ni-based superalloy. The characteristics, oxidation resistance, and mechanical properties of the cryomilled NiCrAlY coatings by LIHC were investigated. By increasing the cryomilling time, the as-received spherical powder experienced a transition from flake-shaped to polygonal structure. The particle size increased firstly and then decreased. Moreover, increasing the cryomilling time induced the columnar growth in the NiCrAlY coatings. This in turn improved the oxidation resistance and the mechanical properties of the coatings. Especially, when the cryomilling time was increased to 15 h, the oxidation resistance of the coating at 1423 K was approximately nine times than that of GH4169 superalloy. The tensile strength of the cryomilled (15 h) coating increased to 1085 MPa and the ductility was 20.7%.

Keywords

lasermechanical alloyingmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1338 - 1347
Copyright
Copyright © Materials Research Society 2016 

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