康前飞,杨卫民,魏坤霞,汪丹丹,刘细良,胡静.离子氮铝共渗方法及对42CrMo钢组织性能的影响[J].表面技术,2023,52(1):394-400.
KANG Qian-fei,YANG Wei-min,WEI Kun-xia,WANG Dan-dan,LIU Xi-liang,HU Jing.Development of a Novel Plasma Aluminum-nitriding Methodology and Its Effect on the Microstructure and Properties for 42CrMo Steel[J].Surface Technology,2023,52(1):394-400 |
| 离子氮铝共渗方法及对42CrMo钢组织性能的影响 |
| Development of a Novel Plasma Aluminum-nitriding Methodology and Its Effect on the Microstructure and Properties for 42CrMo Steel |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.040 |
| 中文关键词: 42CrMo钢 离子渗氮 氮铝共渗 耐磨性 摩擦因数 电沉积 |
| 英文关键词:42CrMo steel plasma nitriding plasma aluminum-nitriding wear resistance friction coefficient electrodeposition |
| 基金项目:国家自然科学基金(21978025、51774052);江苏省第三期优势学科建设项目(PAPD-3);江苏高校品牌专业建设工程资助项目(TAPP);常州科技项目(CJ20210114);江苏省研究生创新基金项目(CX10292) |
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| Author | Institution |
| KANG Qian-fei | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China;Huaide College, Changzhou University, Jiangsu Jingjiang 214500, China |
| YANG Wei-min | National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou 213164, China;Changzhou Surface Advanced Materials Technology Co., Ltd., Jiangsu Changzhou 213164, China |
| WEI Kun-xia | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China;Huaide College, Changzhou University, Jiangsu Jingjiang 214500, China |
| WANG Dan-dan | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China;National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou 213164, China |
| LIU Xi-liang | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China;National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou 213164, China |
| HU Jing | Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou 213164, China;National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou 213164, China;Huaide College, Changzhou University, Jiangsu Jingjiang 214500, China |
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| 中文摘要: |
| 目的 研发离子氮铝共渗试验方法，达到不影响42CrMo钢基体组织性能前提下，显著提高试样表面硬度和耐磨性效果。方法 采用电解法在42CrMo钢表面沉积氢氧化铝膜，再在520 ℃/4 h工艺下进行离子氮铝共渗处理，并在相同工艺参数条件与传统离子渗氮进行对比。用光学显微镜、维氏显微硬度计、摩擦磨损测试机、X射线衍射仪及SEM对截面显微组织、截面硬度、耐磨性及物相等进行了测试和分析。结果 获得了离子氮铝共渗试验方法，在520 ℃/4 h相同工艺参数下，离子氮铝共渗形成的化合物层和有效硬化层厚度比常规离子渗氮显著增加，其中，化合物层厚度由17.24 μm增加到52.13 μm，有效扩散层从175 μm增加到1 050 μm，相当于等离子处理效率提升6倍;同时，渗层形成了AlN及FexAl强化相，大幅度提高了渗层的硬度及耐磨性能。表面硬度由750HV0.025提高到1 250HV0.025，摩擦因数由常规离子渗氮0.52下降到0.29，磨损率由常规离子渗氮3.22×10‒5 g/(m.N)下降到1.21×10‒5 g/(m.N)，磨痕明显减轻。结论 采用电解硝酸铝生成氢氧化铝沉淀附着在工件表面作为预处理，获得了离子氮铝共渗试验方法，与常规离子渗氮相比，离子氮铝共渗形成了多层次渗层结构，大幅度提高常规离子处理效率、表面硬度及耐磨性。 |
| 英文摘要: |
| Plasma nitriding is a widely used environment friendly chemical heat treatment, which can effectively improve the surface layer hardness, wear resistance and corrosion resistance of metal components. Unfortunately, it is hard to meet the advanced technical requirements of very high efficiency and excellent performances proposed by some cooperative enterprises. To meet the advanced technical requirements, conventional plasma nitriding is necessary to be promoted. It has been reported that titanium-enhanced plasma nitriding has much high efficiency and better performance than that of conventional plasma nitriding. Since Aluminum can react with both nitrogen and iron to form very hard AlN and FexAl compounds, it can be supposed that Aluminun-enhanced plasma nitriding may have better performances than that of titanium-enhanced plasma nitriding. However, since Aluminun has much lower melting point, Aluminun-enhanced plasma nitriding, also called plasma aluminum-nitriding, can not be conducted by putting Aluminun sheet or particles in the furnace during plasma nitriding, as was performed during titanium-enhanced plasma nitriding. Therefore, the novel method to carry out plasma aluminum-nitriding was primarily explored and developed in this research. And the effect of the novel plasma aluminum-nitriding technology on the efficiency and properties were systematically investigated. The novel plasma aluminum-nitriding in this research was consisted of the following two steps:firstly, Aluminum hydroxide film was deposited on 42CrMo steel by electrolysis; secondly, plasma aluminum-nitriding was carried out at 520 ℃/4 h. Meanwhile, conventional plasma nitriding was conducted under the same conditions as a reference. Optical microscope, X-ray diffractometer, Vickers microhardness tester, friction and wear tester and SEM were used to test and analyze the microstructure, phase, hardness and wear resistance of the cross section. The results showed that at the same process parameter of 520 ℃/4 h, a multi-layer structure was formed; the thickness of compound layer and effective hardening layer by plasma aluminum-nitriding was significantly higher than that by conventional plasma nitriding. The thickness of compound layer increased from 17.24 μm to 52.13 μm, and the effective diffusion layer increased from 175 μm to 1 050 μm, it was equivalent to 6 times increase in plasma treating efficiency. Meanwhile, AlN and FexAl phases were formed in the surface layer, which resulted in great enhancement of hardness and wear resistance of the samples, the surface hardness increased from 750HV0.025 to 1 250HV0.025, the friction coefficient decreased from 0.52 to 0.29, the wear rate decreased from 3.22×10‒5 g/(m.N) to 1.21×10‒5 g/(m.N), and the wear marks are obviously reduced. In all, novel plasma aluminum-nitriding technology was primarily developed by using electrolytic aluminum nitrate to generate aluminum hydroxide precipitation on the surface of samples as a pretreatment. Plasma treating efficiency, surface hardness and wear resistance was dramatically enhanced by the novel plasma aluminum-nitriding technology due to the formation of multi-layer structure. |
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