Microstructure, Anti-wear Properties and Numerical Simulation of Lubricants, Volume II

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: closed (1 May 2024) | Viewed by 2814

Special Issue Editors

School of Mechanical Engineering, Northeast Electric Power University, Jilin 132012, China
Interests: microstructure; wear and corrosions; lubricant design; surface coating technology
Special Issues, Collections and Topics in MDPI journals
School of Mechanical Engineering, Northeast Electric Power University, Jilin 132012, China
Interests: alloy; tribological behavior; surface treatment
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Lubricants play an important role in reducing friction damage on the surface of objects. In machinery, metallurgy and other fields, many products are at risk of wear and corrosion. In order to improve the properties of products in harsh working conditions, the performance of lubricants becomes important. Therefore, we invite you to submit your original research to this Lubricants Special Issue entitled “Microstructure, Anti-wear Properties and Numerical Simulation of Lubricants, Volume II”. The topics of interest for this Special Issue include (but are not restricted to):

  • Lubricant microstructure characterization;
  • Design of lubricants;
  • Simulation and analysis of lubricants;
  • Surface coating technology;
  • Novel lubricants;
  • Friction and wear properties of coatings;
  • Other aspects of lubricants.

Dr. Yu Liu
Dr. Yali Gao
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • microstructure
  • wear and corrosion
  • simulation analysis
  • lubricant design
  • surface coating technology

Published Papers (2 papers)

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Research

15 pages, 9055 KiB  
Article
Numerical Simulation and Wear Resistance Property of Ni-Based Alloy Coating on the Surface of Ti-6Al-4V Substrate
by Yu Liu, Xiaofu Liu, Zhiqiang Xu and Miao Yu
Lubricants 2023, 11(12), 513; https://doi.org/10.3390/lubricants11120513 - 3 Dec 2023
Viewed by 1303
Abstract
Laser cladding is a new technology to improve the wear resistance or corrosion resistance properties of metal parts. A finite element model of laser cladding coating was established by numerical simulation technology. The temperature field distribution was studied and analyzed during the laser [...] Read more.
Laser cladding is a new technology to improve the wear resistance or corrosion resistance properties of metal parts. A finite element model of laser cladding coating was established by numerical simulation technology. The temperature field distribution was studied and analyzed during the laser cladding process at three different scanning speeds and three different laser powers. A Ni-based coating was also fabricated on the substrate by a CO2 laser. The optimum parameters of the laser cladding were selected and compared with the melt pool depth and width of the Ni-based coating. Then, the cooling rate, temperature gradient, temperature and stress fields were calculated and analyzed. The growth mechanism of the crystal structure was analyzed by scanning electron microscope (SEM). The wear resistance of the Ni-based coating was measured by a friction and wear testing machine. The results showed that the optimal parameters were laser power 1600 W and scanning speed 3 mm/s. The temperature trends at different locations were similar. The calculated maximum residual stress was 0.157 GPa. The stress concentration appeared near the surface and both sides of the cladding layer. From the coating’s microstructure, it could be seen that it contained a large number of columnar dendrites, and the crystal size gradually decreased with the increase of cooling rate. The wear rates of the Ti-6Al-4V (TC4) substrate and the Ni-based coating were 6.98 mm3/(N·m) and 3.45 mm3/(N·m), respectively. The Ni-based layer had a low wear rate and good wear resistance, which is helpful to obtain good friction and wear resistance of TC4 substrates. Full article
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12 pages, 4272 KiB  
Article
Effect of Ceramic Particles on Ni-Based Alloy Coating Fabricated via Laser Technology
by Yanhua Zhang, Yinan Wang, Li Wang, Ying Jin, Zhaofeng Wang and Xiaoling Shi
Lubricants 2023, 11(11), 483; https://doi.org/10.3390/lubricants11110483 - 9 Nov 2023
Viewed by 1278
Abstract
Laser cladding is a new technology for fabricating coatings with good properties, such as wear resistance, lubrication, and corrosion resistance. Usually, parts of 45 steel are used as a shaft under conditions of high-speed rotation or friction and wear, and they have a [...] Read more.
Laser cladding is a new technology for fabricating coatings with good properties, such as wear resistance, lubrication, and corrosion resistance. Usually, parts of 45 steel are used as a shaft under conditions of high-speed rotation or friction and wear, and they have a short service life and sometimes cause accidents. In order to avoid serious accidents, a cladding coating made from a Ni-based alloy with ceramic particles was fabricated via laser technology on a substrate of 45 steel in this research. The microstructure and properties were investigated via SEM, EDS, XRD, and a wear and friction tester. The results show that there was an obvious boundary between the cladding coating and the substrate. The main phases were γ(Fe, Ni), WC, TiC, Cr2Ti, and Cr23C6. In the middle of cladding coating, the microstructure was composed of dendrite and cellular crystals, while the microstructure was composed of equiaxial crystals in the bonding region. Inside the cellular crystal, the main phase was γ~(Fe, Ni), which occasionally also showed the appearance of some white particles inside the cellular crystal. Compared with the cellular crystal, the boundary had less of the Fe and Ni elements and more of the Cr and W elements. The amount of C element around the dendrite crystal was more than that around the boundary of cellular crystal due to the long formation time of dendrite. The white particles around the boundary were carbides, such as WC and Cr23C6 phases. Meanwhile, the segregation of the Si element also appeared around the boundaries of the crystal. The maximum microhardness was 772.4 HV0.5, which was about 3.9 times as much as the substrate’s microhardness. The friction coefficients of the 45 steel substrate and Ni-based alloy coating were usually around 0.3 and 0.1, respectively. The Ni-based coating had a smaller coefficient and more stable fluctuations. The wear volume of the cladding coating (0.16 mm3) was less than that of the substrate (1.1 mm3), which was about 14.5% of the wear volume of 45 steel substrate. The main reason was the existence of reinforced phases, such as γ~(Fe, Ni), Cr23C6, and Cr2Ti. The added small WC and TiC particles also enhanced the wear resistance further. The main wear mechanism of the cladding coating was changed to be adhesive wear due to the ceramic particles, which was helpful in improving the service life of 45 steel. Full article
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