| 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],52(1):394-400 |
| 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 |
| KeyWord:42CrMo steel plasma nitriding plasma aluminum-nitriding wear resistance friction coefficient electrodeposition |
| Author | Institution |
| KANG Qian-fei |
Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou , China;Huaide College, Changzhou University, Jiangsu Jingjiang , China |
| YANG Wei-min |
National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou , China;Changzhou Surface Advanced Materials Technology Co., Ltd., Jiangsu Changzhou , China |
| WEI Kun-xia |
Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou , China;Huaide College, Changzhou University, Jiangsu Jingjiang , China |
| WANG Dan-dan |
Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou , China;National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou , China |
| LIU Xi-liang |
Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou , China;National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou , China |
| HU Jing |
Jiangsu Key Laboratory of Materials Surface Science and Technology, Jiangsu Changzhou , China;National Experimental Demonstration Center for Materials Science and Engineering, Changzhou University, Jiangsu Changzhou , China;Huaide College, Changzhou University, Jiangsu Jingjiang , China |
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| Abstract: |
| 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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