Yingju Li , Shasha Qu , Tianyu Liu , Bingyu Lu , Xiaohui Feng , Yuansheng Yang
{"title":"High temperature oxidation behavior of γʹ-strengthened CoNi-base superalloys","authors":"Yingju Li , Shasha Qu , Tianyu Liu , Bingyu Lu , Xiaohui Feng , Yuansheng Yang","doi":"10.1016/j.corcom.2023.11.005","DOIUrl":null,"url":null,"abstract":"<div><div>Oxidation behavior of <em>γ</em>ʹ-strengthened CoNi-base superalloys was investigated with isothermal oxidation tests conducted in air at 800 and 900 °C, respectively, for 100 h. It is observed that both 30Ni-10Al-4W-4Ti-2Ta (4W2Ta) and 30Ni-10Al-5W-4Ti-1Ta (5W1Ta) alloys exhibit a three-layered oxide scale structure after oxidation. Addition of Ta increases oxidation mass gain of CoNi-based high-temperature alloys, but the effects on the type and distribution of oxidation products are not significant. However, the oxidation temperature has a great influence on oxide surface morphology and oxidation mechanisms for those two alloys. After oxidation at 800 °C, the outermost oxide film contains Co<sub>3</sub>O<sub>4</sub>, CoO, and NiO, and when the oxidation temperature is 900 °C, the outermost oxide film contains only CoO.</div></div>","PeriodicalId":100337,"journal":{"name":"Corrosion Communications","volume":"16 ","pages":"Pages 61-70"},"PeriodicalIF":9.5000,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Communications","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2667266924000434","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Oxidation behavior of γʹ-strengthened CoNi-base superalloys was investigated with isothermal oxidation tests conducted in air at 800 and 900 °C, respectively, for 100 h. It is observed that both 30Ni-10Al-4W-4Ti-2Ta (4W2Ta) and 30Ni-10Al-5W-4Ti-1Ta (5W1Ta) alloys exhibit a three-layered oxide scale structure after oxidation. Addition of Ta increases oxidation mass gain of CoNi-based high-temperature alloys, but the effects on the type and distribution of oxidation products are not significant. However, the oxidation temperature has a great influence on oxide surface morphology and oxidation mechanisms for those two alloys. After oxidation at 800 °C, the outermost oxide film contains Co3O4, CoO, and NiO, and when the oxidation temperature is 900 °C, the outermost oxide film contains only CoO.
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