ZG40Cr27Ni4耐热钢表面Fe-Al合金层的组织与抗氧化性能

doi:10.13251/j.issn.0254-6051.2025.07.005

金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 32-39.DOI: 10.13251/j.issn.0254-6051.2025.07.005

ZG40Cr27Ni4耐热钢表面Fe-Al合金层的组织与抗氧化性能

王震^1,2, 林立¹, 刘天龙², 殷福星², 骆智超²

1.沈阳工业大学材料科学与工程学院, 辽宁沈阳 110870;
2.广东省科学院新材料研究所广东省金属强韧化技术与应用重点实验室, 广东广州 510650

收稿日期:2025-01-20 修回日期:2025-04-29 出版日期:2025-07-25 发布日期:2025-07-28
通讯作者: 骆智超,副研究员,博士,E-mail:luozhichao@gdinm.com
作者简介:王震(1998—),男,硕士研究生,主要研究方向为铸造耐热钢使役性能与材料表面防护技术,E-mail:1491049379@qq.com。
基金资助:
国家重点研发计划(2022YFB3707501);广东省科学院项目(2022GDASZH-2022010202)

Microstructure and oxidation resistance of Fe-Al alloyed layer on surface of ZG40Cr27Ni4 heat resisting steel

Wang Zhen^1,2, Lin Li¹, Liu Tianlong², Yin Fuxing², Luo Zhichao²

1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang Liaoning 110870, China;
2. Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou Guangdong 510650, China

Received:2025-01-20 Revised:2025-04-29 Online:2025-07-25 Published:2025-07-28

摘要/Abstract

摘要： 以ZG40Cr27Ni4双相耐热钢为基体,采用热浸镀铝和700 ℃、900 ℃扩散热处理的方法在其表面制备Fe-Al合金层。使用SEM和EBSD对合金层的微观形貌、成分和物相组成进行表征和分析,采用1000 ℃氧化试验对抗氧化性能进行评价。结果表明,ZG40Cr27Ni4钢表面制备Fe-Al合金层的主要物相是FeAl_2.8和Fe₄Al₁₃。经900 ℃扩散处理后,Fe₄Al₁₃相根据Al含量的差异可分为Al-Fe₄Al₁₃、(Fe, Cr)₄Al₁₃与(Fe, Ni)₄Al₁₃这3种成分特征。分别在700、900 ℃扩散处理后,Fe-Al合金层的硬度均较基体显著提高。经1000 ℃氧化试验后,Fe-Al合金层表面形成致密的Al₂O₃氧化膜,显著提高了ZG40Cr27Ni4钢的抗氧化性能。

关键词: 耐热钢, 热浸镀铝, 铝合金化层, 组织, 抗氧化性

Abstract: Fe-Al alloyed layer was prepared on the surface of ZG40Cr27Ni4 duplex heat resisting steel by hot-dip aluminizing and diffusion heat treatment at 700 ℃ and 900 ℃. The microstructure, composition, and phase constituents of the Fe-Al alloyed layer were characterized and analyzed using scanning electron microscope (SEM) and electron back scatter diffraction (EBSD). The oxidation resistance was evaluated through oxidation testing at 1000 ℃. The results indicate that the primary phases of the Fe-Al alloyed layer are FeAl_2.8 and Fe₄Al₁₃. After diffusion heat treatment at 900 ℃, depending on the Al content, the Fe₄Al₁₃ phase can be further classified into three compositional variants: Al-Fe₄Al₁₃, (Fe, Cr)₄Al₁₃, and (Fe, Ni)₄Al₁₃. After diffusion heat treatment at 700 ℃ and 900 ℃ respectively, the hardness of the Fe-Al alloyed layers is significantly higher than that of the steel substrate. After oxidation at 1000 ℃, a dense Al₂O₃ oxide film is formed on the surface of the Fe-Al alloyed layer, significantly improving the oxidation resistance of the ZG40Cr27Ni4 steel.

Key words: heat resisting steel, hot-dip aluminizing, Al-alloyed layer, microstructure, oxidation resistance

中图分类号:

TG142

王震, 林立, 刘天龙, 殷福星, 骆智超. ZG40Cr27Ni4耐热钢表面Fe-Al合金层的组织与抗氧化性能[J]. 金属热处理, 2025, 50(7): 32-39.

Wang Zhen, Lin Li, Liu Tianlong, Yin Fuxing, Luo Zhichao. Microstructure and oxidation resistance of Fe-Al alloyed layer on surface of ZG40Cr27Ni4 heat resisting steel[J]. Heat Treatment of Metals, 2025, 50(7): 32-39.

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ZG40Cr27Ni4耐热钢表面Fe-Al合金层的组织与抗氧化性能

Microstructure and oxidation resistance of Fe-Al alloyed layer on surface of ZG40Cr27Ni4 heat resisting steel

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