多相Ni3Al基高温合金微区氧化行为
收稿日期: 2021-11-18
修回日期: 2021-12-03
网络出版日期: 2022-09-14
基金资助
国家自然科学基金项目(51774212);国家自然科学基金项目(52122409);天津市自然科学基金项目(20JCYBJC00950)
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)
以多相Ni3Al基高温合金为对象，通过热处理得到了3种微区结构：枝晶干γ' + γ两相区、枝晶间β相和包裹着枝晶间β相的γ'包覆层，研究了不同微区组织在1000℃的等温氧化行为。3个微区在氧化初期呈现出不同的氧化行为：γ'包覆层处为明显的双层氧化膜结构，呈现胞状凸起，外部是混合层(NiO、NiFe2O4和Al2O3)，内部为单一Al2O3层，而枝晶干γ' + γ两相区和枝晶间β相形成单层Al2O3膜。随着等温氧化时间的延长，由于晶格扩散占据主导地位，不同微区氧化膜厚度差显著缩小，3个微区的氧化膜组成逐渐趋于一致，形成致密单一的Al2O3层。
关键词： Ni3Al基高温合金; 氧化行为; γ'相; β相
胡敏 , 周生玉 , 国京元 , 胡明昊 , 李冲 , 李会军 , 王祖敏 , 刘永长 . 多相Ni3Al基高温合金微区氧化行为[J]. 金属学报, 2023 , 59(10) : 1346 -1354 . DOI: 10.11900/0412.1961.2021.00497
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
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