四元<strong>Co-Ni-Cr-Al</strong>合金高温氧化模式及其转变机理

doi:10.11900/0412.1961.2022.00200

金属学报

2024, Vol. 60

Issue (7): 947-956 DOI: 10.11900/0412.1961.2022.00200

研究论文

本期目录 | 过刊浏览

四元Co-Ni-Cr-Al合金高温氧化模式及其转变机理

吕云蕾¹, 任延杰¹^,²(

), 冯抗抗¹, 周梦妮¹, 王文³, 陈荐¹, 牛焱¹(

)

1 长沙理工大学能源与动力工程学院长沙 410076
2 浙江科技大学机械与能源工程学院杭州 310023
3 中国科学院金属研究所沈阳 110016

High Temperature Oxidation Mode and Transformation Mechanism of Quaternary Co-Ni-Cr-Al Alloys

LV Yunlei¹, REN Yanjie¹^,²(

), FENG Kangkang¹, ZHOU Mengni¹, WANG Wen³, CHEN Jian¹, NIU Yan¹(

)

1 College of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410076, China
2 School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China
3 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

吕云蕾, 任延杰, 冯抗抗, 周梦妮, 王文, 陈荐, 牛焱. 四元Co-Ni-Cr-Al合金高温氧化模式及其转变机理[J]. 金属学报, 2024, 60(7): 947-956.
Yunlei LV, Yanjie REN, Kangkang FENG, Mengni ZHOU, Wen WANG, Jian CHEN, Yan NIU. High Temperature Oxidation Mode and Transformation Mechanism of Quaternary Co-Ni-Cr-Al Alloys[J]. Acta Metall Sin, 2024, 60(7): 947-956.

全文: PDF(4216 KB) HTML

摘要:

为深入探究Cr、Al元素对Co-Ni合金高温氧化行为的影响，本工作研究了四元Co-20Ni-8Cr-xAl (x = 3、5，质量分数，%)合金在纯氧中800、900、1000和1100℃下的氧化行为。氧化后，2种合金表面均生成了复杂的氧化膜。2种合金在800、900和1000℃下均有不连续Al₂O₃膜生成，1100℃下仅在Co-20Ni-8Cr-5Al表面生成Al₂O₃。温度从800℃升到900℃，合金的氧化速率均提高，而温度从1000℃升高到1100℃后，2种合金的氧化速率均下降。合金中Al含量由3%增加到5%，Co-Ni-Cr-Al合金的氧化速率随之下降，但5%的Al含量仍不足以令合金表面生成保护性的Al₂O₃膜。与Al含量相同的Co-Ni-Al三元合金相比，Cr和Al的同时存在有利于降低四元Co-Ni-Cr-Al合金的氧化速率。

关键词 ： Co-Ni-Cr-Al合金, 高温氧化, 氧化动力学, 保护性氧化膜

Abstract：

The addition of Ni to cobalt-based alloys can form the γ′ phase, which can significantly improve their mechanical properties and high-temperature oxidation resistance. The oxidation behavior of quaternary Co-20Ni-8Cr-xAl (x = 3 or 5, mass fraction, %) alloys was investigated in 1.013 × 10⁵ Pa O₂ at 800, 900, 1000, and 1100^oC. Also, the effects of Al and/or Cr contents and temperature on the oxidation properties of the alloys were explored by analyzing the oxidation kinetics of the alloys and the cross-sectional morphology characteristics of the scales, revealing the oxidation mechanism of these alloys. After oxidation, both the alloys formed complex scales with irregular thickness and composition. Alumina scales were generated for each alloy at 800, 900, and 1000^oC and only for Co-20Ni-8Cr-5Al at 1100^oC. The increase in temperature from 800^oC to 900^oC has a negative effect on the oxidation resistance, resulting in greatly accelerated oxidation rates. Conversely, that from 1000^oC to 1100^oC has a positive effect on the oxidation of the two alloys, causing a decrease in the oxidation rate. The oxidation rate of the Co-Ni-Cr-Al alloy decreases when the Al content in the alloy is increased from 3% to 5%, but 5% is still not sufficient to form continuous alumina scales. The simultaneous presence of Cr and Al is beneficial to reducing the oxidation rate of the quaternary Co-Ni-Cr-Al alloys compared with the ternary Co-Ni-Al alloy with the same Al content.

Key words： Co-Ni-Cr-Al alloy high temperature oxidation oxidation kinetics protective scale

收稿日期: 2022-04-27

ZTFLH:

TB31

基金资助:国家自然科学基金项目(52171066);国家自然科学基金项目(51771034);湖南省自然科学基金项目(2020JJ4610);湖南省研究生科研创新项目(CX20200871)

通讯作者: 任延杰，yjren@csust.edu.cn，主要从事动力设备的腐蚀与防护研究;
牛焱，yniu@csust.edu.cn，主要从事金属的高温腐蚀与防护研究

Corresponding author: REN Yanjie, professor, Tel: 13657310308, E-mail: yjren@csust.edu.cn;

作者简介: 吕云蕾，女，1995年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00200 或 https://www.ams.org.cn/CN/Y2024/V60/I7/947

表1 Co-20Ni-8Cr-3Al和Co-20Ni-8Cr-5Al合金的设计成分和实际成分

图1 Co-20Ni-8Cr-3Al和Co-20Ni-8Cr-5Al合金在800、900、1000和1100℃下1.013 × 105 Pa O2中氧化20 h的动力学曲线

图2 Co-20Ni-8Cr-3Al和Co-20Ni-8Cr-5Al合金在800、900、1000和1100℃下1.013 × 105 Pa O2中氧化20 h的动力学曲线

图3 Co-20Ni-8Cr-3Al合金在800℃、1.013 × 105 Pa O2中氧化24 h的截面形貌和相应的元素分布

图4 Co-20Ni-8Cr-3Al合金在900℃、1.013 × 105 Pa O2中氧化24 h的截面形貌

图5 Co-20Ni-8Cr-3Al合金在1000和1100℃下1.013 × 105 Pa O2中氧化20 h的截面形貌

图6 Co-20Ni-8Cr-5Al合金在800和900℃下1.013 × 105 Pa O2中氧化24 h的截面形貌

图7 Co-20Ni-8Cr-5Al合金在1000和1100℃下1.013 × 105 Pa O2中氧化20 h的截面形貌

图8 Co-20Ni-8Cr-3Al和Co-20Ni-8Cr-5Al合金在800和900℃下1.013 × 105 Pa O2中氧化24 h后的XRD谱

图9 Co-20Ni-8Cr-3Al和Co-20Ni-8Cr-5Al合金在1000和1100℃ 1.013 × 105 Pa O2中氧化20 h后的XRD谱

表2 Co-20Ni-8Cr-3Al和Co-20Ni-8Cr-5Al合金4种类型氧化膜的氧化产物

表3 Co-20Ni-8Cr-3Al和Co-20Ni-8Cr-5Al合金在800、900、1000和1100℃下产生的氧化膜结构类型

图10 Co-20Ni-8Cr-xAl四元合金与Co-20Ni-xAl三元合金[31]在800、900和1000℃下1.013 × 105 Pa O2中氧化20 h的动力学曲线的比较

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