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Metals
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Renovation of Parts to Save Metals
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Renovation of Parts to Save Metals

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (31 December 2022) | Viewed by 8938

Special Issue Editors

Dr. Anna Guzanová

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Guest Editor
Associate Professor, Department of Technology, Materials and Computer Supported Production, Faculty of Mechanical Engineering, Technical University of Košice, Mäsiarska 74, 040 01 Košice, Slovakia
Interests: surface integrity; thermal spraying; hard surfacing; corrosion; joining of materials; tribology
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Janette Brezinová

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Guest Editor
Department of Technology, Materials and Computer Supported Production, Faculty of Mechanical Engineering, Technical University of Košice, Mäsiarska 74, 040 01 Košice, Slovakia
Interests: welding; surface treatment; heat treatment; surface quality assessment
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ján Viňáš

E-Mail Website
Guest Editor
Department of Technology, Materials and Computer Supported Production, Faculty of Mechanical Engineering, Technical University of Košice, Mäsiarska 74, 040 01 Košice, Slovakia
Interests: welding; weld cladding; hard surfacing; materials design; materials science; brazing; non-destructive testing; weldability
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

New challenges have recently arisen in the field of R&D, whose aim is to transform the industry toward the efficient use of existing resources and raw materials. The scope of engineering activities is shifting from the design of new machine parts to renovation technologies to use alternative renovation processes. Degradation processes, which are a natural guide to the operational life of components, manifest primarily through the deterioration of conditions in the surface layers of the component. Material losses, deterioration of roughness, and undesired changes in the structure of the surface layers lead to decommissioning of the component. The basic task of renovation technologies is to restore the geometric shape and dimensions of the functional surfaces of the components, as well as to increase the wear resistance of surfaces and extend the service life of renovated components. In practice, to increase the quality and service life of the renovated components, a renovation layer of a higher quality than that of the base material (better sliding properties, increased corrosion resistance, etc.) must be chosen. In the case of renovation of worn parts, it is first necessary to correctly analyze the type of wear, the impact of the environment, working conditions, and based on this analysis, to choose a suitable renovation technology. The creation of new layers gives the possibility to change the properties of the surface and adapt it to the operating conditions, or to give the surface completely new properties and thus give the product a new added value.

The aim of the Special Issue is to provide space for researchers to present the latest research results in the field of the use of advanced technologies in the renovation of functional surfaces using new additional materials and coatings. The Special Issue provides space to present a wide range of methods for evaluating mechanical, tribological and corrosive properties in order to determine the quality of renovation layers and coatings.

Prof. Dr. Anna Guzanová
Prof. Dr. Janette Brezinová
Prof. Dr. Ján Viňáš
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. Metals 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

  • renovation
  • hardfacing
  • thermal spraying
  • additive manufacturing
  • direct energy deposition
  • corrosion resistance
  • tribology
  • new filler materials
  • thin film deposition
  • simulation of renovation processes

Published Papers (5 papers)

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Research

22 pages, 14654 KiB  
Article
Possibilities of Repairing Functional Surfaces of Molds for Injecting Al Alloys Using Manual GTAW Cladding
by Janette Brezinová, Miroslav Džupon, Ján Viňáš, Marek Vojtko, Jakub Brezina, Iveta Vasková and Viktor Puchý
Metals 2022, 12(11), 1781; https://doi.org/10.3390/met12111781 - 22 Oct 2022
Cited by 1 | Viewed by 1529
Abstract
The paper presents the results of research that is focused on the renovation of molds for high-pressure aluminum casting. An analysis of the worn molds was carried out after they were removed from the operator. The extent and mechanism of the wear were [...] Read more.
The paper presents the results of research that is focused on the renovation of molds for high-pressure aluminum casting. An analysis of the worn molds was carried out after they were removed from the operator. The extent and mechanism of the wear were determined. GTAW (Gas tungsten arc welding) technology was chosen for the renovation of the shaped parts of the molds. The renovation layers were realized with four types of additional materials Cronitex RC 44, UTP A 73 G 3, UTP A 673 and Dievar® TIG. The quality of the coatings was assessed by destructive as well as non-destructive tests. The mixing of the build-up layers with the base material was determined on the basis of structural analyses. The hardness of the cladding was determined by a metallographic analysis of the cross crowns with the Vickers method. The resistance of the cladding was tested by a complete immersion in a melt of AlSi8Cu3 aluminum alloy which was maintained at a temperature of 680 ± 20 °C in a laboratory resistance furnace for 120 and 300 min. The tribological properties of the produced deposits were determined using the ball-on-disc dry method. Based on the experiments that were carried out, it is possible to recommend the additive material UTP A 73 G 3 for the restoration of the functional surfaces of molds for the injection of Al alloys as the patterns that were created by it have shown the best results in terms of their resistance to Al melt, which is the dominant degradation factor limiting the life of the molds. Full article
(This article belongs to the Special Issue Renovation of Parts to Save Metals)
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12 pages, 2888 KiB  
Article
Impact of Cladding Technology on Residual Stresses within the Renovation of High Pressure Die Casting Molds
by Patrik Šarga, Janette Brezinová, Ján Viňáš, Miroslav Pástor and Jakub Brezina
Metals 2022, 12(3), 388; https://doi.org/10.3390/met12030388 - 23 Feb 2022
Cited by 4 | Viewed by 1610
Abstract
Residual stresses significantly affect the overall lifetime of constructions. The main disadvantage of residual stresses is that their effect and magnitude is not evident at first sight and can only be reliably determined using experimental methods. The experiment aimed to find out how [...] Read more.
Residual stresses significantly affect the overall lifetime of constructions. The main disadvantage of residual stresses is that their effect and magnitude is not evident at first sight and can only be reliably determined using experimental methods. The experiment aimed to find out how much the cladding technology affects the residual stresses within the renovation of high pressure die casting molds. A total of four samples were prepared by different cladding techniques and with varying thicknesses of the result layer. The samples were then annealed and mechanically treated. Finally, the hole drilling method was applied to determine the residual stresses in the samples. The results point to more significant differences in the levels of residual stresses, which were determined in the subsurface layers. Full article
(This article belongs to the Special Issue Renovation of Parts to Save Metals)
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15 pages, 6723 KiB  
Article
Defectoscopic and Geometric Features of Defects That Occur in Sheet Metal and Their Description Based on Statistical Analysis
by Ihor Konovalenko, Pavlo Maruschak, Halyna Kozbur, Janette Brezinová, Jakub Brezina and Anna Guzanová
Metals 2021, 11(11), 1851; https://doi.org/10.3390/met11111851 - 18 Nov 2021
Cited by 14 | Viewed by 1977
Abstract
Features of the defect class “scratches, attritions, lines”, their geometric structure, and their causes are analyzed. An approach is developed that defines subclasses within this class of technological defects based on additional analysis of morphological features. The analysis of the reasons for these [...] Read more.
Features of the defect class “scratches, attritions, lines”, their geometric structure, and their causes are analyzed. An approach is developed that defines subclasses within this class of technological defects based on additional analysis of morphological features. The analysis of the reasons for these subclasses allows additional information to be obtained about the rolling process, identifying additional signs of defects, regulating the rolling conditions of steel strips more accurately, and diagnosing the equipment condition. Full article
(This article belongs to the Special Issue Renovation of Parts to Save Metals)
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15 pages, 7560 KiB  
Article
Renovation of Crystallizer Surface Using Electrodeposited Alloy Coating to Increase High-Temperature Abrasion Resistance
by Janette Brezinová, Mária Hagarová, Dagmar Jakubéczyová, Gabriela Baranová and Olegas Prentkovskis
Metals 2021, 11(10), 1629; https://doi.org/10.3390/met11101629 - 13 Oct 2021
Cited by 1 | Viewed by 1269
Abstract
This paper deals with the evaluation of mechanical and tribological properties of Ni-Co galvanic coatings at elevated temperatures. The coatings were deposited on the copper surface, which in practice is the material of the crystallizer. Ni-Co coatings are manufactured to increase the abrasion [...] Read more.
This paper deals with the evaluation of mechanical and tribological properties of Ni-Co galvanic coatings at elevated temperatures. The coatings were deposited on the copper surface, which in practice is the material of the crystallizer. Ni-Co coatings are manufactured to increase the abrasion resistance of the crystallizer surface at elevated operating temperatures. The microhardness (HV0.05) measurements of the coating at 400 °C were used to determine its mechanical properties. The Ball-on-Disc Test was used to determine the tribological properties of the coatings at 400 °C. The mechanical and tribological properties of Ni-Co coatings at elevated temperature were compared to the results of experiments performed at room temperature. When heated to 400 °C, HV0.05 decreased by 9.5 to 22% (depending on Co content in the coating) compared to the values that were measured at 23 °C. The change in the COF for the Ni-Co coating at 400 °C was from 0.680 to 0.750 depending on the Co amount compared to the values at 23 °C. The COF values at room temperature ranged from 0.373 to 0.451. The places with higher wt. % Co had better friction properties than the places with lower wt. % Co. Full article
(This article belongs to the Special Issue Renovation of Parts to Save Metals)
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16 pages, 8287 KiB  
Article
Innovation of Biomass Crusher by Application of Hardfacing Layers
by Ján Viňáš, Janette Brezinová, Jakub Brezina and Peter Hermel
Metals 2021, 11(8), 1283; https://doi.org/10.3390/met11081283 - 13 Aug 2021
Cited by 3 | Viewed by 1575
Abstract
This paper presents the innovation possibilities of the crushers functional parts and the results of layers’ renovation analyses of the surfaces worn by biomass crusher hammers. The worn functional surfaces of hammers made of Hardox 400 material were renovated by manual arc welding [...] Read more.
This paper presents the innovation possibilities of the crushers functional parts and the results of layers’ renovation analyses of the surfaces worn by biomass crusher hammers. The worn functional surfaces of hammers made of Hardox 400 material were renovated by manual arc welding method (welded with a filled wire electrode with its own protection). As an additive material, Lincore 60-O tubular wire from Lincoln Electric was used. The quality of weld layers was assessed on the metallographic sections, where the presence of internal defects was monitored, and the microstructures of welds were identified. In addition to the metallographic analysis, the microhardness in terms of EN ISO 9015-2 was assessed. Based on the performed experiments, it is suitable for the crusher innovation to recommend the chain replacement with a shaped weldment made of Hardox 400 material, the weldability of which is very good, and to make at least one hardfacing layer on its functional surfaces. With this innovation, the service life of the crushing segment could be extended by more than ten-fold. Full article
(This article belongs to the Special Issue Renovation of Parts to Save Metals)
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