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 in | Metals (Basel ) Vol. 7; no. 2; p. 59 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
Basel
MDPI AG
15.02.2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2075-4701 2075-4701 |
| DOI | 10.3390/met7020059 |
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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. |
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| AbstractList | 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. |
| Author | Ha, Tae-Hyung Kim, Il-Hyun Kim, Hyun-Gil Kim, Jeong-Min |
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| References | Yue (ref_10) 2011; 509 Zhang (ref_12) 2015; 331 Kim (ref_2) 2015; 465 ref_13 Gonzalez (ref_7) 2005; 342 ref_11 ref_9 Jin (ref_4) 2016; 287 ref_8 Terrani (ref_3) 2013; 438 ref_5 Chen (ref_6) 2016; 660 Kuprin (ref_1) 2015; 465 |
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| SubjectTerms | Coating CrAl Diffusion laser coating Lasers Microstructure Oxidation Oxidation resistance Substrates Zircaloy-4 Zirconium Zirconium base alloys |
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| Title | Microstructure and Oxidation Behavior of CrAl Laser-Coated Zircaloy-4 Alloy |
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