Super304H奥氏体不锈钢的高温抗氧化性能

doi:10.13251/j.issn.0254-6051.2023.01.014

金属热处理 ›› 2023, Vol. 48 ›› Issue (1): 80-86.DOI: 10.13251/j.issn.0254-6051.2023.01.014

Super304H奥氏体不锈钢的高温抗氧化性能

李凌霄¹, 赵艳君^1,2, 张敬瑞¹, 李平珍¹, 韦凤¹, 叶伯溪¹

1.广西大学资源环境与材料学院, 广西南宁 530004;
2.广西大学广西有色金属及特色材料加工重点实验室, 广西南宁 530004

收稿日期:2022-08-02 修回日期:2022-10-27 出版日期:2023-01-25 发布日期:2023-02-03
通讯作者: 赵艳君,副教授,博士,E-mail:zhaoyanjun@gxu.edu.cn
作者简介:李凌霄(1998—),女,硕士研究生,主要研究方向为先进奥氏体不锈钢,E-mail: 3319272586@qq.com。
基金资助:
国家自然科学基金(51661004);广西创新驱动项目(桂科AA18242003-3);广西有色金属及特色材料加工重点实验室项目(GXYSSF1809)

High temperature oxidation resistance of Super304H austenitic stainless steel

Li Lingxiao¹, Zhao Yanjun^1,2, Zhang Jingrui¹, Li Pingzhen¹, Feng Wei¹, Ye Boxi¹

1. School of Resources, Environment and Materials, Guangxi University, Nanning Guangxi 530004, China;
2. Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, Guangxi University, Nanning Guangxi 530004, China

Received:2022-08-02 Revised:2022-10-27 Online:2023-01-25 Published:2023-02-03

摘要/Abstract

摘要： 对Super304H奥氏体不锈钢在550～800 ℃进行高温氧化试验,结合氧化动力学规律去研究Super304H奥氏体不锈钢的氧化机理。结果表明,Super304H奥氏体不锈钢在550～800 ℃氧化质量增加曲线遵循抛物线规律,在750～800 ℃时60 h以内氧化质量增加趋势最明显,100 h后质量增加高达0.005 mg·mm^-2。在550～750 ℃逐渐生成致密的氧化膜,主要由Cr₂O₃和Fe_3-xCr_xNiO₄混合氧化物和少量CuCrMnO₄构成。升高温度会促进Cr的选择性氧化,使得Cr₂O₃保护膜开裂,800 ℃时暴露出的Fe基体与氧原子反应生成瘤状Fe₃O₄,氧化膜厚重并伴有剥落现象。应变速率为3.2×10^-4 s^-1时,不锈钢的抗拉强度随氧化温度升高而降低,600 ℃ 的抗拉强度最大,达350 MPa;700～750 ℃时伸长率最好,可达28%。

关键词: Super304H奥氏体不锈钢, 高温抗氧化, 氧化膜, 氧化机理

Abstract: Oxidation mechanism of Super304H austenitic stainless steel was studied by high temperature oxidation test at 550-800 ℃ and combining with the law of oxidation kinetics. The results show that the oxidation mass gain curve of the Super304H austenitic stainless steel follows the parabola law at 550-800 ℃, the trend of mass gain is the most obvious within 60 h at 750-800 ℃, and the mass gain is up to 0.005 mg·mm^-2 after 100 h. A dense oxide film is gadually formed at 550-750 ℃, which is mainly composed of Cr₂O₃ and Fe_3-xCr_xNiO₄ mixed oxides and a small amount of CuCrMnO₄. Increasing temperature makes the Super304H austenitic stainless steel promote the selective oxidation of Cr, and make the Cr₂O₃ protective film crack. At 800 ℃, the exposed Fe matrix reacts with oxygen atoms to form tumor Fe₃O₄, and the oxide film is thick and peels off. when strain rate is 3.2×10^-4 s^-1, the tensile strength of the stainless steel decreases with the increase of oxidation temperature, and reaches 350 MPa as the maximum at 600 ℃. The elongation is the best at 700-750 ℃, which is 28%.

Key words: Super304H austenitic stainless steel, high temperature oxidation resistance, oxide film, oxidation mechanism

中图分类号:

TG142

李凌霄, 赵艳君, 张敬瑞, 李平珍, 韦凤, 叶伯溪. Super304H奥氏体不锈钢的高温抗氧化性能[J]. 金属热处理, 2023, 48(1): 80-86.

Li Lingxiao, Zhao Yanjun, Zhang Jingrui, Li Pingzhen, Feng Wei, Ye Boxi. High temperature oxidation resistance of Super304H austenitic stainless steel[J]. Heat Treatment of Metals, 2023, 48(1): 80-86.

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Super304H奥氏体不锈钢的高温抗氧化性能

High temperature oxidation resistance of Super304H austenitic stainless steel

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