多相<strong>Ni<sub>3</sub>Al</strong>基高温合金微区氧化行为

doi:10.11900/0412.1961.2021.00497

金属学报

2023, Vol. 59

Issue (10): 1346-1354 DOI: 10.11900/0412.1961.2021.00497

研究论文

本期目录 | 过刊浏览

多相Ni₃Al基高温合金微区氧化行为

胡敏, 周生玉, 国京元, 胡明昊, 李冲(

), 李会军, 王祖敏, 刘永长

天津大学材料科学与工程学院水利安全与仿真国家重点实验室天津 300354

Oxidation Behavior of Micro-Regions in Multiphase Ni₃Al-Based Superalloys

HU Min, ZHOU Shengyu, GUO Jingyuan, HU Minghao, LI Chong(

), LI Huijun, WANG Zumin, LIU Yongchang

State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China

引用本文:

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.
Min HU, Shengyu ZHOU, Jingyuan GUO, Minghao HU, Chong LI, Huijun LI, Zumin WANG, Yongchang LIU. Oxidation Behavior of Micro-Regions in Multiphase Ni₃Al-Based Superalloys[J]. Acta Metall Sin, 2023, 59(10): 1346-1354.

全文: PDF(3693 KB) HTML

摘要:

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

Abstract：

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 1000^oC, 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

收稿日期: 2021-11-18

ZTFLH:

TG132.3

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)

通讯作者: 李冲，lichongme@tju.edu.cn，主要从事金属结构材料组织控制的研究

Corresponding author: LI Chong, professor, Tel: 13021398676, E-mail: lichongme@tju.edu.cn

作者简介: 胡敏，女，1997年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00497 或 https://www.ams.org.cn/CN/Y2023/V59/I10/1346

图1 Ni3Al基高温合金热处理后显微组织的SEM像

表1 Ni3Al基高温合金不同区域化学成分的EDS分析 (atomic fraction / %)

图2 Ni3Al基高温合金在1000℃氧化10 min后表面形貌的SEM像

图3 Ni3Al基高温合金在1000℃氧化30及100 h后表面形貌的SEM像

图4 Ni3Al基高温合金在1000℃氧化10 min和100 h的XRD谱

图5 Ni3Al基高温合金在1000℃氧化10 min和100 h后不同区域表面氧化膜的Raman光谱

图6 Ni3Al基高温合金在1000℃氧化10 min后不同微区的Auger电子能谱(AES)元素深度分布

图7 枝晶干γ' + γ在1000℃氧化10 min后截面形貌的TEM像、选区电子衍射(SAED)花样以及框线区域的EDS元素面扫分布

图8 枝晶间β相在1000℃氧化10 min后截面形貌的TEM像、SAED花样以及框线区域的EDS元素面扫分布

图9 γ'包覆层在1000℃氧化10 min后截面形貌的TEM像、SAED花样以及相应的EDS元素面扫分布

图10 Ni3Al基高温合金在1000℃氧化30 h截面形貌的SEM-BSE像和相应的EDS元素分布

图11 Ni3Al基高温合金在1000℃氧化100 h截面形貌的SEM-BSE像和相应的EDS元素分布

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