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

• 组织与性能 • 上一篇    下一篇

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. 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 Zhen1,2, Lin Li1, Liu Tianlong2, Yin Fuxing2, Luo Zhichao2   

  1. 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: 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FeAl2.8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 FeAl2.8 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

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