Oxidation Behavior of Micro-Regions in Multiphase Ni3Al-Based Superalloys
Received date: 2021-11-18
Revised date: 2021-12-03
Online published: 2022-09-14
Supported by
National Natural Science Foundation of China(51774212);National Natural Science Foundation of China(52122409);Natural Science Foundation of Tianjin City(20JCYBJC00950)
Ni3Al-based superalloys are widely used in aero-engine parts. In addition to having a good temperature bearing capacity, the oxidation resistance of the alloy is also high. In this work, a multiphase Ni3Al-based superalloy was selected as the experimental material. Three micro-regions (γ' + γ dendrite, interdendritic β phase, and γ' envelope) containing different phases were obtained by heat treatment. The isothermal oxidation behavior of the micro-regions was studied under 1000oC, where the three micro-regions exhibited different oxidation behaviors at the initial stage of oxidation. The γ' envelope has an obvious double-layer oxide scale showing a cellular bulge. The outer layer is a mixed layer (NiO, NiFe2O4, and Al2O3), and the inner layer is a single Al2O3 layer. However, the γ' + γ dendrite and the interdendritic β phase form a single layer of the Al2O3 film. With increasing isothermal oxidation time, the oxide scale composition of the three micro-regions gradually tends to be the same, forming a dense single Al2O3 layer.
Key words： Ni3Al-based superalloy; oxidation behavior; γ' phase; β phase
HU Min , ZHOU Shengyu , GUO Jingyuan , HU Minghao , LI Chong , LI Huijun , WANG Zumin , LIU Yongchang . Oxidation Behavior of Micro-Regions in Multiphase Ni3Al-Based Superalloys[J]. Acta Metall Sin, 2023 , 59(10) : 1346 -1354 . DOI: 10.11900/0412.1961.2021.00497
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