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Metals 2017, 7(2), 59; doi:10.3390/met7020059

Microstructure and Oxidation Behavior of CrAl Laser-Coated Zircaloy-4 Alloy

1
Department of Advanced Materials Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea
2
Light Water Reactor Fuel Technology Division, Korea Atomic Energy Research Institute, 989-111 Daedek-daero, Yuseong-gu, Daejeon 34057, Korea
*
Author to whom correspondence should be addressed.
Received: 24 October 2016 / Accepted: 10 February 2017 / Published: 15 February 2017
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Abstract

Laser coating of a CrAl layer on Zircaloy-4 alloy was carried out for the surface protection of the Zr substrate at high temperatures, and its microstructural and thermal stability were investigated. Significant mixing of CrAl coating metal with the Zr substrate occurred during the laser surface treatment, and a rapidly solidified microstructure was obtained. A considerable degree of diffusion of solute atoms and some intermetallic compounds were observed to occur when the coated specimen was heated at a high temperature. Oxidation appears to proceed more preferentially at Zr-rich region than Cr-rich region, and the incorporation of Zr into the CrAl coating layer deteriorates the oxidation resistance because of the formation of thermally unstable Zr oxides. View Full-Text
Keywords: laser coating; Zircaloy-4; CrAl; microstructure; oxidation laser coating; Zircaloy-4; CrAl; microstructure; oxidation
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Kim, J.-M.; Ha, T.-H.; Kim, I.-H.; Kim, H.-G. Microstructure and Oxidation Behavior of CrAl Laser-Coated Zircaloy-4 Alloy. Metals 2017, 7, 59.

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