New surface treatment using shot blast for improving oxidation resistance of TiAl-base alloys

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• 作者：Kawaura ; Hiroyuki ; Kawahara ; Hiroshi ; Nishino ; Kazuaki ; Saito ; Takashi
• 关键词：Oxidation resistance ; Al₂O₃ scale ; Surface treatment ; Shot blast ; Intermetallic compound ; WO₃
• 刊名：Materials Science and Engineering ; A
• 出版年：2002
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：June, 2002
• 卷：329-331
• 期：Complete
• 页码：589-595
• 文件大小：673 K

摘要

A new surface treatment using shot blasts with WO₃ powder has been developed. This has been most effective in improving the cyclic oxidation resistance of TiAl-base alloy in air and in a diesel engine exhaust gas atmosphere of up to 1223 K. This effect is attributed to the formation of an Al₂O₃ layer in an oxidation atmosphere. The above layer is supposed to be formed as follows: Since the WO₃ powder is shot repeatedly during the surface treatment, a WO₃ layer adhering to the substrate is formed on the surface. This layer causes the preferential oxidation of aluminum at the early stage of oxidation, resulting in the formation of a sound and continuous Al₂O₃ layer. The developed surface treatment gives the same oxidation resistance as that of nickel-base superalloy Inconel 713C up to 1223 K, and is applicable to complex-shape parts with as-cast skin surfaces, such as turbocharger wheels.