Heat Treatment and Surface Engineering of Tools and Dies

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: 20 August 2024 | Viewed by 6305

Special Issue Editors

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China
Interests: heat treatment and surface engineering
Special Issues, Collections and Topics in MDPI journals
Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
Interests: thermochemical treatment of steels
Special Issues, Collections and Topics in MDPI journals
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China
Interests: heat treatment and surface engineering

Special Issue Information

Dear Colleagues,

We would like to invite you to submit to this Special Issue on “Heat Treatment and Surface Engineering of Tools and Dies”, and we also sincerely invite you to present your work on the 5th Int’l Conf. on Heat Treatment and Surface Engineering of Tools and Dies (for details, see http://www.htse-td.com/). Today, a new epoch is approaching in terms of industrial revolution via innovations and international cooperation. In machinery manufacture and other relevant industries, the quality of tools and dies is of extreme importance in determining the performance of products and can be improved sufficiently through heat treatment and surface engineering technologies. This Special Issue and the conference will bring together researchers of industrial and academic backgrounds to discuss the state-of-the-art developments in heat treatment and surface engineering of tools and dies. The technical areas of interest include but are not limited to:

  • Intelligent manufacturing
  • Physical metallurgy
  • Heat treatment
  • Thermochemical treatment
  • Coating technology
  • Deep cold treatment
  • Modeling and software
  • Gas for HTSE
  • Advanced equipment

Prof. Dr. Yanxiang Zhang
Dr. Ruiliang Liu
Prof. Dr. Mufu Yan
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. Coatings 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

  • intelligent manufacturing
  • physical metallurgy
  • heat treatment
  • thermochemical treatment
  • coating technology
  • deep cold treatment
  • modeling and software
  • gas for HTSE
  • equipment for HTSE

Published Papers (5 papers)

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Research

16 pages, 4953 KiB  
Article
Discharge Characteristics and Mechanisms of Electrolytic Discharge Processing by Jet Mask
by Chaoda Chen, Shaofang Wu, Hao Wu, Liang Shan, Kangxing Li and Siyang Wu
Coatings 2023, 13(11), 1933; https://doi.org/10.3390/coatings13111933 - 12 Nov 2023
Viewed by 674
Abstract
As a novel microfabrication method, electrochemical discharge machining has remarkable effects on the forming and processing of brittle and hard materials and non-conductive materials, but little research has been done on the electrochemical discharge mode in the jet state. To fulfil the potential [...] Read more.
As a novel microfabrication method, electrochemical discharge machining has remarkable effects on the forming and processing of brittle and hard materials and non-conductive materials, but little research has been done on the electrochemical discharge mode in the jet state. To fulfil the potential of this technology, innovative research on the discharge characteristics and mechanism of electrochemical discharge machining in the jet mask is proposed. A high-speed camera observation experiment was set up to record the process of the jet flow column discharge formation and penetration. Changes in the electric field of the electrolytic jet channel were analysed by simulation software, and the morphology of the machined micro-pits was observed using a microscope. A mathematical derivation of the dielectric electric field in the gas–liquid two-phase jet column reveals the mechanism of discharge channel formation in the jet state. The experiments show that when the processing voltage is 400 V, a stable continuous spark appears, realizing the unique characteristics of a large-gap long-distance discharge and a flat small circle-shaped discharge mark produced at the bottom of the crater. The actual field strength within the bubble of this model obtained by mathematical derivation is approximately 61.5 kV/cm greater than the critical field strength for air bubble breakdown in the standard state, where bubble breakdown occurs in the discharge. Full article
(This article belongs to the Special Issue Heat Treatment and Surface Engineering of Tools and Dies)
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12 pages, 6798 KiB  
Article
Investigation of the Microstructure and Properties of CoCrFeNiMo High-Entropy Alloy Coating Prepared through High-Speed Laser Cladding
by Qi Zhang, Meiyan Li, Qin Wang, Fuhao Qi, Mengkai Kong and Bin Han
Coatings 2023, 13(7), 1211; https://doi.org/10.3390/coatings13071211 - 06 Jul 2023
Cited by 1 | Viewed by 1113
Abstract
High-speed laser cladding was introduced to prepare a CoCrFeNiMo high-entropy alloy (HEA) coating. The microstructure, composition distribution, micromechanical properties, and corrosion resistance of the CoCrFeNiMo coating were characterized. As a result, the coating exhibited a dual FCC- and BCC-phase structure, and the grain [...] Read more.
High-speed laser cladding was introduced to prepare a CoCrFeNiMo high-entropy alloy (HEA) coating. The microstructure, composition distribution, micromechanical properties, and corrosion resistance of the CoCrFeNiMo coating were characterized. As a result, the coating exhibited a dual FCC- and BCC-phase structure, and the grain size of the coating prepared through high-speed laser cladding was only 2~5 μm. The upper and lower parts of the coating were composed of equiaxed cellular crystals and slender columnar crystals, respectively. The interdendritic structure was a Mo-rich phase that was distributed in a network-like pattern. The nanoindentation tests revealed that the interdendritic BCC phase had high hardness and an elastic modulus as well as excellent resistance to deformation, while the intradendritic FCC phase possessed superior crack propagation resistance. In addition, the two phases could generate cooperative elastic deformation during the elastic deformation stage. The electrochemical performance of the coating was tested in 3.5 wt% NaCl solution, and the corrosion potential Ecorr and corrosion current density Icorr of the coating were −0.362 V and 3.69 × 10−6 A/cm2, respectively. The high-speed laser cladding CoCrFeNiMo HEA coating had excellent corrosion resistance thanks to the presence of the easily passivating element Mo and grain refinement. Full article
(This article belongs to the Special Issue Heat Treatment and Surface Engineering of Tools and Dies)
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10 pages, 3359 KiB  
Communication
Annealing Effect on Microstructure of Novel Ti Doped DLC Multilayer Films
by Shidong Zhang, Guang Jiang, Yang Yang, Hongtao Li, Fuyao Yan, Mufu Yan and Yanxiang Zhang
Coatings 2023, 13(5), 833; https://doi.org/10.3390/coatings13050833 - 26 Apr 2023
Cited by 5 | Viewed by 1274
Abstract
Diamond-like films (DLC) are an exceptional engineering material with excellent performance such as high hardness, low friction coefficient, superior wear resistance and chemical inertness. However, two major problems of high internal stress and poor thermal stability have seriously limited its industrial applications. In [...] Read more.
Diamond-like films (DLC) are an exceptional engineering material with excellent performance such as high hardness, low friction coefficient, superior wear resistance and chemical inertness. However, two major problems of high internal stress and poor thermal stability have seriously limited its industrial applications. In particular, the microstructures and properties of pure DLC films are highly sensitive to high temperature. Therefore, the purpose of this study is to investigate the effect of annealing temperature on the microstructures of the as-prepared films. Ti-doped DLC multilayer films were synthesized by closed field unbalanced magnetron sputtering. The as-deposited films were annealed in the range of 200 to 800 °C. The surface morphology, phase structure and bonding structure of the films were characterized by SEM, AFM, GIXRD and Raman spectroscopy. The resulting films remained a smooth surface after annealing and maintained the nature of amorphous carbon up to 600 °C. The formed phases of graphite carbon and TiC nanocrystallines occur above 600 °C. In addition, the D- and G-bands showed a significant blue shift and the FWHMG shows a declining trend up to 600 °C. This result revealed that the films had high graphitization temperature and good thermal stability due to the formation of TiC nanocrystallines and its novel structure design containing elemental doping, multilayer structuring and functionally graded layering. Full article
(This article belongs to the Special Issue Heat Treatment and Surface Engineering of Tools and Dies)
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12 pages, 5843 KiB  
Article
Study on Fatigue Performance of 2200 MPa High-Strength Wire of Main Cables Based on FE-SAFE
by Hongtao Li, Zhubing Zhou, Sen Liu, Leyong Wei, Jun Zhao and Han Su
Coatings 2023, 13(3), 646; https://doi.org/10.3390/coatings13030646 - 19 Mar 2023
Viewed by 1446
Abstract
In order to estimate the fatigue life of 2200 MPa high-strength steel wire for main cables at the outlet of the cable saddle, a fatigue loading test of a single steel wire was designed, and the value of the friction coefficient in finite [...] Read more.
In order to estimate the fatigue life of 2200 MPa high-strength steel wire for main cables at the outlet of the cable saddle, a fatigue loading test of a single steel wire was designed, and the value of the friction coefficient in finite element simulation and the scale factor in fatigue life analysis were determined. The fatigue life of the steel wire was analyzed by two-stage modelling. The results showed that the fatigue life of steel wire can be simulated effectively when the friction coefficient is 0.21 and the scale factor is 1.15. The fatigue life of 2200 MPa main cable wire at the saddle outlet is 4.78 million loading cycles. The research results laid a foundation for practical engineering application of high-strength steel wire for 2200 MPa main cables. Full article
(This article belongs to the Special Issue Heat Treatment and Surface Engineering of Tools and Dies)
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14 pages, 4711 KiB  
Article
Measurements of Carbon Diffusivity and Surface Transfer Coefficient by Electrical Conductivity Relaxation during Carburization: Experimental Design by Theoretical Analysis
by Wenbo Ma, Jianjun Sheng, Yiheng Wang, Mufu Yan, Yujian Wu, Shaohua Qin, Xiaoliang Zhou and Yanxiang Zhang
Coatings 2022, 12(12), 1886; https://doi.org/10.3390/coatings12121886 - 04 Dec 2022
Viewed by 1178
Abstract
The diffusion coefficient (D) and surface transfer coefficient (β) of carbon are important parameters governing the kinetics of carburization, and some other heat treatment processes accompanied by redistribution of carbon in steel. Here, we propose to use an electrical [...] Read more.
The diffusion coefficient (D) and surface transfer coefficient (β) of carbon are important parameters governing the kinetics of carburization, and some other heat treatment processes accompanied by redistribution of carbon in steel. Here, we propose to use an electrical conductivity relaxation (ECR) method for the in situ measurement of D and β of carbon. The feasibility of the method is discussed by the theoretical modeling of carburization for an infinitely long rectangular sample. The synthetic ECR data for the carburization is simulated by tracking the relaxation of electrical conductivity upon a sharp or a gradual change of carbon potential. Then, by Fourier transform, the synthetic ECR data is transformed to an impedance spectroscopy, which is used for estimation of D and β by fitting with a one-dimensional equivalent circuit model. The effects of the width-to-thickness ratio of the sample and the duration of carbon potential buildup on the accuracy of the estimated D and β are studied. The feasibility of the ECR method is verified, and rational guidance for experimental design is proposed. Full article
(This article belongs to the Special Issue Heat Treatment and Surface Engineering of Tools and Dies)
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