表面纳米化中碳钢在干摩擦条件下的摩擦磨损性能研究.docx
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1、表面纳米化中碳钢在干摩擦条件下的摩擦磨损性能研究Title: Study on the friction and wear properties of carbon steel under dry sliding conditions of surface nanocrystallizationAbstract: In recent years, surface nanocrystallization has been widely used to improve the mechanical properties of materials. In this study, the effect
2、 of surface nanocrystallization on the friction and wear properties of carbon steel was investigated under dry sliding conditions. The surface nanocrystallization was achieved by the shot peening treatment. The friction and wear tests were carried out using a pin-on-disk tribometer. The results show
3、ed that the surface nanocrystallization significantly improved the friction and wear properties of carbon steel. The friction coefficient and wear rate were reduced by 37% and 93%, respectively, compared to the untreated sample. The improved properties were attributed to the formation of a protectiv
4、e nanocrystalline layer and the reduction in grain size.Keywords: Surface nanocrystallization, carbon steel, friction, wear, shot peeningIntroduction: Carbon steel is an important engineering material that is widely used in structural and mechanical components. However, the low surface hardness and
5、poor wear resistance of carbon steel limit its application in harsh environments. Surface nanocrystallization, which refers to the process of reducing the grain size of the surface layer to nanometer scale, has been shown to improve the mechanical properties of materials. In this study, we focus on
6、the effect of surface nanocrystallization on the friction and wear properties of carbon steel under dry sliding conditions.Experimental methods: The carbon steel samples were cut into dimensions of 20 mm 10 mm 3 mm. The surface nanocrystallization was achieved by the shot peening treatment using a g
7、lass bead medium with a size of 0.2-0.3 mm. The shot peening treatment was carried out for 10 minutes at a coverage of 80%. The untreated samples were used as a control. The friction and wear tests were performed using a pin-on-disk tribometer with a load of 5 N and a sliding speed of 1 m/s. The tes
8、t period was 10 minutes, and the sliding distance was 1000 m.Results and discussion: The surface roughness of the treated sample increased due to the shot peening treatment, which was confirmed by SEM observation. The surface nanocrystallization resulted in a significant reduction in the friction co
9、efficient and wear rate of the carbon steel. The friction coefficient and wear rate of the treated sample were reduced by 37% and 93%, respectively, compared to the untreated sample. The reduction in friction and wear was attributed to the formation of a protective nanocrystalline layer on the surfa
10、ce of the carbon steel. The nanocrystalline layer acted as a barrier to prevent the direct contact between the mating surfaces, reducing the friction and wear. In addition, the reduction in grain size resulted in an increase in the hardness and strength of the surface layer, improving the wear resis
11、tance.Conclusion: In this study, the effect of surface nanocrystallization on the friction and wear properties of carbon steel under dry sliding conditions was investigated. The results showed that the surface nanocrystallization significantly improved the friction and wear properties of carbon stee
12、l. The friction coefficient and wear rate were reduced by 37% and 93%, respectively, compared to the untreated sample. The improved properties were attributed to the formation of a protective nanocrystalline layer and the reduction in grain size. Surface nanocrystallization can be an effective metho
13、d to improve the friction and wear properties of carbon steel in various applications.Moreover, the surface nanocrystallization process has a great potential to be applied to various engineering materials, such as aluminum alloys, titanium alloys, and stainless steels, to improve their mechanical pr
14、operties, including wear resistance, corrosion resistance, and fatigue strength. The shot peening treatment is a cost effective and practical way to achieve surface nanocrystallization, which can be easily implemented in industry. The optimization of shot peening parameters, such as peening intensit
15、y, peening duration, and peening coverage, can further enhance the nanocrystallization effect and improve the performance of the materials.In addition, other surface modification techniques, such as surface coating, surface alloying, and surface texturing, can also improve the friction and wear prop
16、erties of materials under different conditions. The combination of different surface modification techniques can lead to synergistic effects and further enhance the performance of the materials in various applications. For instance, the combination of surface nanocrystallization and surface coating
17、has been shown to significantly improve the wear resistance of materials under corrosive and high temperature environments.In summary, the surface nanocrystallization technique using shot peening can effectively improve the friction and wear properties of carbon steel under dry sliding conditions. T
18、he formation of a protective nanocrystalline layer and the reduction in grain size are the main factors contributing to the improved properties. Further optimization of the shot peening process and the combination with other surface modification techniques can lead to even more significant improveme
19、nts in the performance of materials in various applications.Another important aspect of surface nanocrystallization is its potential to improve the fatigue strength of materials. Fatigue failure is a common problem in engineering structures, and it is often related to surface defects and microstruct
20、ural changes caused by cyclic loading. The surface nanocrystallization technique can significantly reduce the surface defects and enhance the fatigue resistance of materials. Studies have shown that shot peening can increase the fatigue life of steels by as much as 3-4 times, depending on the peenin
21、g parameters and the initial microstructure of the materials.Moreover, the surface nanocrystallization technique can also improve the corrosion resistance of materials, especially under aggressive environments such as seawater, acidic or alkaline solutions, and high temperature gases. The nanocrysta
22、lline layer formed by shot peening can act as a barrier against corrosive attacks and reduce the diffusion rate of corrosive species into the material. There are also surface modification techniques, such as surface coating and surface alloying, that can further enhance the corrosion resistance of m
23、aterials by providing a protective or sacrificial layer on the surface.Overall, the surface nanocrystallization technique using shot peening is a promising approach to improve the mechanical, tribological, and corrosion properties of engineering materials. The process is relatively simple and cost-e
24、ffective, and it can be easily integrated into existing manufacturing processes. The optimization of shot peening parameters and the integration with other surface modification techniques can lead to even more significant improvements in the performance of materials under different conditions. With
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