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

被引：4

作者：

Hu Min ^{[1
]}

Zhou Shengyu ^{[1
]}

Guo Jingyuan ^{[1
]}

Hu Minghao ^{[1
]}

Li Chong ^{[1
]}

Li Huijun ^{[1
]}

Wang Zumin ^{[1
]}

Liu Yongchang ^{[1
]}

机构：

[1] Tianjin Univ, Sch Mat Sci & Engn, State Key Lab Hydraul Engn Simulat & Safety, Tianjin 300354, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2023年 / 59卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Ni3Al-based superalloy; oxidation behavior; gamma ' phase; beta phase; HIGH-TEMPERATURE OXIDATION; BORON-DOPED NI3AL; MECHANICAL-PROPERTIES; OXIDE-FILMS; MICROSTRUCTURE; STEEL; ALLOYS; ALUMINA;

D O I：

10.11900/0412.1961.2021.00497

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 (gamma ' + gamma dendrite, interdendritic beta phase, and gamma ' envelope) containing different phases were obtained by heat treatment. The isothermal oxidation behavior of the micro-regions was studied under 1000 degrees C, where the three micro-regions exhibited different oxidation behaviors at the initial stage of oxidation. The gamma ' 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 gamma ' + gamma dendrite and the inter-dendritic beta 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.

引用

页码：1346 / 1354

页数：9

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