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http://dx.doi.org/10.4150/KPMI.2021.28.5.396

Oxidation Behaviors and Degradation Properties of Aluminide Coated Stainless Steel at High Temperature  

Hwang, Cheol Hong (Department of Materials Science and Engineering, Hanbat National University)
Lee, Hyo Min (Department of Materials Science and Engineering, Hanbat National University)
Oh, Jeong Seok (Department of Materials Science and Engineering, Hanbat National University)
Hwang, Dong Hyeon (Department of Materials Science and Engineering, Hanbat National University)
Hwang, Yu Seok (Department of Materials Science and Engineering, Hanbat National University)
Lee, Jong Won (Department of Materials Science and Engineering, Hanbat National University)
Choi, Jeong Mook (Jinhap Corp.)
Park, Joon Sik (Department of Materials Science and Engineering, Hanbat National University)
Publication Information
Journal of Powder Materials / v.28, no.5, 2021 , pp. 396-402 More about this Journal
Abstract
Stainless steel, a type of steel used for high-temperature parts, may cause damage when exposed to high temperatures, requiring additional coatings. In particular, the Cr2O3 product layer is unstable at 1000℃ and higher temperatures; therefore, it is necessary to improve the oxidation resistance. In this study, an aluminide (Fe2Al5 and FeAl3) coating layer was formed on the surface of STS 630 specimens through Al diffusion coatings from 500℃ to 700℃ for up to 25 h. Because the coating layers of Fe2Al5 and FeAl3 could not withstand temperatures above 1200℃, an Al2O3 coating layer is deposited on the surface through static oxidation treatment at 500℃ for 10 h. To confirm the ablation resistance of the resulting coating layer, dynamic flame exposure tests were conducted at 1350℃ for 5-15 min. Excellent oxidation resistance is observed in the coated base material beneath the aluminide layer. The conditions of the flame tests and coating are discussed in terms of microstructural variations.
Keywords
Pack cementation coatings; Stainless steel; Dynamic flame tests; Oxidation behaviors;
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