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Poster communications

Influence of the Water Vapor Presence on the High Temperature Oxidation Behavior of two Chromium-Rich Cobalt-Based Alloys

Abstract : Besides nitrogen and oxygen, water vapor is often present in the hot air in which refractory alloys are working, and its presence influences the behavior of superalloys in high temperature oxidation. Notably, it is widely recognized that water vapor plays an important role, but not necessarily detrimental for the metallic component. The presence of water vapor in air tends enhancing the volatilization of Cr2O3 covering the chromia-forming alloys, but it is also true that a slow-down in oxidation speed is sometimes induced by water vapor as well as an improvement of the scale adherence when temperature varies. For many studies dealing with the effect of water vapor on the high temperature oxidation, this is the nickel-based alloys family which is considered, notably aluminum-rich Ni alloys solidified in order to be single-crystalline finally. However one of the latest works concerning Ni-based alloys but polycrystalline and equi-axed, concerned an alloy which contained no aluminum but only chromium for its oxidation and corrosion resistance at high temperature. In contrast, although they also represent an important family of high temperature alloys, the cobalt-based alloys were less studied in this field. Since such alloys are also used in the hottest parts of aero-engines and in the hottest pieces involved of various industrial processes (such glass working), with in both cases the possible presence of water vapor, it appears interesting to better know the effect of water vapor on the behavior in oxidation at high temperature for this second important family of alloys. Recently a few studies were devoted to the effect of water vapor on the high temperature oxidation resistance of chromium-rich cobalt-based superalloys, models or commercial. In this work, two model Co-10Ni-30Cr and Co-10Ni-30Cr-0.5C-7.5Ta alloys were considered (all contents in wt.%). They were elaborated by melting pure elements with a high frequency induction furnace under pure argon. The thermogravimetry tests were carried out at 1000, 1100 and 1200°C in a synthetic air humidified with a specific device.
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https://hal.archives-ouvertes.fr/hal-03352260
Contributor : Patrice Berthod Connect in order to contact the contributor
Submitted on : Thursday, September 23, 2021 - 9:31:33 AM
Last modification on : Wednesday, November 3, 2021 - 4:49:30 AM

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Patrice Berthod, Lionel Aranda, Thierry Schweitzer. Influence of the Water Vapor Presence on the High Temperature Oxidation Behavior of two Chromium-Rich Cobalt-Based Alloys. 9th International Symposium on High-Temperature Corrosion and Protection of Materials (HTCPM 2016), May 2016, Les Embiez, France. ⟨hal-03352260⟩

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