Al对Fe-20Cr-35Ni-0.6Nb合金显微组织和抗氧化性的影响

doi:10.13251/j.issn.0254-6051.2022.12.024

金属热处理 ›› 2022, Vol. 47 ›› Issue (12): 138-145.DOI: 10.13251/j.issn.0254-6051.2022.12.024

Al对Fe-20Cr-35Ni-0.6Nb合金显微组织和抗氧化性的影响

许万剑^1,2, 贾国栋¹, 杨春丽², 王梓谢¹, 潘杰¹, 肖学山¹

1.上海大学材料研究所, 上海 200072;
2.国家不锈钢制品质量监督检验中心(兴化), 江苏泰州 225721

收稿日期:2022-08-27 修回日期:2022-11-01 出版日期:2022-12-25 发布日期:2023-01-05
通讯作者: 肖学山,教授,博士,E-mail: xsxiao@mail.shu.edu.cn
作者简介:许万剑(1987—),男,工程师,博士研究生,主要研究方向为高温合金材料,E-mail:xuwanjian2008@126.com。
基金资助:
江苏省科技厅重大创新载体建设项目-上海大学兴化特种不锈钢研究院建设(BY2013089)

Effect of Al on microstructure and oxidation resistance of Fe-20Cr-35Ni-0.6Nb alloy

Xu Wanjian^1,2, Jia Guodong¹, Yang Chunli², Wang Zixie¹, Pan Jie¹, Xiao Xueshan¹

1. Institute of Materials, Shanghai University, Shanghai 200072, China;
2. National Stainless Steel Quality Supervision and Inspection Center (Xinghua), Taizhou Jiangsu 225721, China

Received:2022-08-27 Revised:2022-11-01 Online:2022-12-25 Published:2023-01-05

摘要/Abstract

摘要： 采用增量法研究了不同Al含量(0.5%、1.5%、2.5%,质量分数)的Fe-20Cr-35Ni-0.6Nb含Nb合金在1000 ℃空气条件下的抗氧化。采用SEM、EDS、TEM、拉曼光谱等手段研究了合金的显微组织和氧化膜特性。结果表明,3种含Nb合金组织为单相奥氏体,基体中存在少量弥散分布的NbC沉淀相,氧化前后沉淀相含量和晶粒大小保持不变。添加0.5%和1.5%的Al后,含Nb合金的表面形成多层结构的氧化膜,最外层和第三层为Cr₂O₃,次表层主要为NiCr₂O₄、NiFe₂O₄和Fe₂O₃,最内层为Al₂O₃内氧化层。基体中的NbC析出相和氧化膜中少量Nb的氧化物(Nb₂O₅)加剧了氧化膜的疏松。当Al含量增加到2.5%时,含Nb合金表面形成连续致密的Al₂O₃氧化膜,降低了Fe-20Cr-35Ni-0.6Nb合金的氧化速率,提高了抗氧化性。

关键词: Fe-20Cr-35Ni-0.6Nb合金, Al, NbC, Al₂O₃氧化膜, 抗高温氧化

Abstract: Oxidation resistance behaviors of Fe-25Cr-35Ni-0.6Nb-xAl (x=0.5%, 1.5%, 2.5%, mass fraction) Nb-containing alloys at 1000 ℃ in air were investigated by mass gain method. The microstructure and oxide scales of the alloys were observed and analyzed by SEM, EDS, TEM and Raman spectroscopy. The results show that the microstructure of the three Nb-containing alloys is single-phase austenite, and a small amount of NbC precipitated phases are dispersed in the matrix. The content of precipitated phase and the grain size remain unchanged before and after oxidation. With the addition of 0.5% and 1.5% Al, a multilayer oxide film forms on the surface of the Nb-containing alloys, of which the first and third layers are Cr₂O₃, the subsurface layer is mainly composed of NiCr₂O₄, NiFe₂O₄ and Fe₂O₃, and the innermost layer is Al₂O₃ internal oxide. In addition, the porosity of the oxide film is aggravated by NbC precipitates in the matrix and a small amount of Nb oxides (Nb₂O₅) in the oxide film. When the Al content increases to 2.5%, a continuous and dense Al₂O₃ oxide film forms on the surface of Fe-25Cr-35Ni-0.6Nb alloy, which reduces the oxidation rate and improves the oxidation resistance of the alloy.

Key words: Fe-20Cr-35Ni-0.6Nb alloy, Al, NbC, Al₂O₃ oxide film, high-temperature oxidation resistance

中图分类号:

TG142.1

许万剑, 贾国栋, 杨春丽, 王梓谢, 潘杰, 肖学山. Al对Fe-20Cr-35Ni-0.6Nb合金显微组织和抗氧化性的影响[J]. 金属热处理, 2022, 47(12): 138-145.

Xu Wanjian, Jia Guodong, Yang Chunli, Wang Zixie, Pan Jie, Xiao Xueshan. Effect of Al on microstructure and oxidation resistance of Fe-20Cr-35Ni-0.6Nb alloy[J]. Heat Treatment of Metals, 2022, 47(12): 138-145.

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Al对Fe-20Cr-35Ni-0.6Nb合金显微组织和抗氧化性的影响

Effect of Al on microstructure and oxidation resistance of Fe-20Cr-35Ni-0.6Nb alloy

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