变电场辅助低温渗硼制备单相Fe2B渗层

doi:10.13251/j.issn.0254-6051.2024.08.034

金属热处理 ›› 2024, Vol. 49 ›› Issue (8): 195-199.DOI: 10.13251/j.issn.0254-6051.2024.08.034

变电场辅助低温渗硼制备单相Fe₂B渗层

丁红珍^1,2, 李航², 邱万奇²

1.顺德职业技术学院智能制造学院, 广东顺德 528300;
2.华南理工大学材料科学与工程学院, 广东广州 510640

收稿日期:2024-03-02 修回日期:2024-06-13 出版日期:2024-08-25 发布日期:2024-09-27
作者简介:丁红珍(1981—),女,副教授,硕士,主要研究方向为材料表面强化,E-mail:28605792@qq.com
基金资助:
国家自然科学基金(51971095)

Single-phase Fe₂B layer prepared by variable electric field assisted pack-boriding at low temperature

Ding Hongzhen^1,2, Li Hang², Qiu Wanqi²

1. School of Intelligent Manufacturing, Shunde Polytechnic, Shunde Guangdong 528300, China;
2. School of Materials Science and Engineering, South China University of Technology, Guangzhou Guangdong 510640, China

Received:2024-03-02 Revised:2024-06-13 Online:2024-08-25 Published:2024-09-27

摘要/Abstract

摘要： 以α-Al₂O₃为填充剂,2%活性炭为添加剂,对40CrNiMo钢进行恒压交流电场辅助渗硼,研究了渗硼电流的变化规律。通过调节交流电场电压得到稳定的低温渗硼温度,在40CrNiMo钢表面制备渗硼层,利用X射线衍射(XRD)、扫描电镜(SEM)和显微硬度计对渗硼层进行了表征。结果表明,因活性炭吸附在α-Al₂O₃粉末表面形成稳定的导电结构,使电场辅助渗硼不同阶段的渗硼电流相对稳定,从而可得到相对稳定的渗硼温度。调节电场电压将实际渗硼温度控制在较低温度(650、680、700 ℃),可在40CrNiMo钢表面制备致密单相Fe₂B渗硼层。经SEM观察渗硼层厚度≥13 μm,且渗层表层硬度均较高,即使在650 ℃渗硼,硬度也可达约1200 HV0.05。

关键词: 变电场, 低温渗硼, 硬度, Fe₂B

Abstract: Using α-Al₂O₃ powder as boriding filler and 2% activated carbon as additive, the variation of boriding current was investigated under a constant AC electric field assisted pack-boriding carried out on 40CrNiMo steel. By adjusting the AC electric field voltage to obtain stable low temperature boriding temperature, a borided layer was prepared on the surface of 40CrNiMo steel and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and microhardness tester. The results show that a stable conductor is created as a result of activated carbon adhering to the Al₂O₃ powder's surface, which stabilizes the boriding current at different stages of the electric field assisted pack-boriding, resulting in a relatively stable boriding temperature. A dense single-phase Fe₂B borided layer on the surface of 40CrNiMo steel can be prepared by adjusting the electric field voltage to control the actual boriding temperature at a lower temperature (650, 680, 700 ℃). The SEM observation shows that the thickness of the borided layer is ≥13 μm. The surface hardness of the borided layer is relatively high and can reach about 1200 HV0.05 even at 650 ℃.

Key words: variable electric field, low temperature boriding, hardness, Fe₂B

中图分类号:

TG156.8

丁红珍, 李航, 邱万奇. 变电场辅助低温渗硼制备单相Fe₂B渗层[J]. 金属热处理, 2024, 49(8): 195-199.

Ding Hongzhen, Li Hang, Qiu Wanqi. Single-phase Fe₂B layer prepared by variable electric field assisted pack-boriding at low temperature[J]. Heat Treatment of Metals, 2024, 49(8): 195-199.

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变电场辅助低温渗硼制备单相Fe₂B渗层

Single-phase Fe₂B layer prepared by variable electric field assisted pack-boriding at low temperature

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