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

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 tre...

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Published inMetals (Basel ) Vol. 7; no. 2; p. 59
Main Authors Kim, Jeong-Min, Ha, Tae-Hyung, Kim, Il-Hyun, Kim, Hyun-Gil
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 15.02.2017
Subjects
Coating
CrAl
Diffusion
laser coating
Lasers
Microstructure
Oxidation
Oxidation resistance
Substrates
Zircaloy-4
Zirconium
Zirconium base alloys
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ISSN2075-4701
2075-4701
DOI10.3390/met7020059

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Summary: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.
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ISSN:2075-4701
2075-4701
DOI:10.3390/met7020059