Issue №: 1 (132)
The journal presents the results of scientific research and addresses current issues in the development and improvement of agricultural equipment and technologies, particularly in the design, production, and operation of machines and technical systems in the agro-industrial complex, including aspects of their efficient functioning.
INFLUENCE OF THERMO-OXIDATION AND VIBRATION STRENGTHENING METHODS ON THE FRACTURE RESISTANCE OF HARD ALLOYS
Tomas ŪKSAS – Junior Researcher of the Agriculture Academy of Vytautas Magnus University (Studentų Str. 15A, Akademija, LT-53362 Akademija, Kaunas district, Kaunas, Lithuania, e-mail: tomas.uksas@vdu.lt, https://orcid.org/0000-0003-1915-5830).
Krzysztof MUDRYK – Doctor of Engineering Sciences, Professor of the Faculty of Production and Power Engineering, University of Agriculture in Krakow (30-149 Krakow, Poland, e-mail: krzysztof.mudryk@ur.krakow.pl, https://orcid.org/0000-0002-6212-6958).
This article examines the influence of thermo-oxidative and vibration strengthening methods on the resistance of hard alloys to brittle fracture. Cemented carbides based on tungsten carbide with a cobalt binder (WC-Co) are widely used in mining, drilling, and cutting tools operating under conditions of high loads and dynamic impacts. Under such operating conditions, the reliability and durability of hard-alloy tools depend not only on hardness and wear resistance but also on the ability of the material to resist crack initiation and propagation.
The theoretical basis of the research is the Griffith–Orowan brittle fracture theory, which relates the strength of brittle materials to the effective surface energy and the critical length of defects present in the material. Particular attention is given to the role of the cobalt binder phase in the fracture mechanism of WC–Co alloys. It is assumed that the main contribution to the fracture energy is associated with the plastic deformation of the cobalt phase located near the crack tip. Consequently, changes in the structural state of the binder phase during post-sintering treatments may significantly influence the mechanical properties of the alloy.
The experimental results demonstrate that both thermo-oxidative and vibration treatments lead to an increase in the strength characteristics of WC–Co alloys. The strengthening effect is mainly associated with structural and mechanical changes occurring in the cobalt binder phase, which increases the ability of the material to absorb deformation energy near the crack tip.
The obtained results confirm the effectiveness of combined strengthening technologies for improving the reliability and durability of hard-alloy tools. These findings may be useful for optimizing technological processes in the production of cemented carbide components intended for operation under severe loading conditions.
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About journal
The magazine "Engineering, Energy, Transport AIC" is included in the list of scientific professional editions of Ukraine on technical sciences
(Category "Б", Order of the Ministry of Education and Science of Ukraine dated 02.07.2020 №886)
According to the decision of National Council of Television and Radio Broadcasting of Ukraine from 25.04.2024 No. 1337 the scientific journal «Engineering, Energy, Transport AIC» has the ID of the Media R30-05173.
The journal "Engineering, Energy, Transport AIC" is indexed according to the following databases and catalogs:
Certificate of state registration of mass media: No. 21906-11806 P dated 03/12/2016.
Founder of the journal: Vinnytsia National Agrarian University
Type of publication: journal
Kind of publication: scientific
Publication status: domestic
Year of foundation: 1997
Periodicity: 4 times per year
Volume: 18-20 conv. print. sheet (А4)
ISSN: 2520-6168 (print version), (online version)
Language of publication: (mixed languages) Ukrainian, English
The sphere of distribution and category of readers: national, foreign, faculty, scientists, entrepreneurs.
The periodical edition is included to the List of scientific professional publications of Ukraine on technical sciences, approved by order of the Ministry of Education and Science of Ukraine in 05.16.2016, No. 515.
The journal "Engineering, Energy, Transport AIC" is included in the "Catalog of Ukrainian Publications".
Subscription to the journal can be issued in each post office. The subscription index is 99720.
Technology, energy, agriculture transport AIC is a scholarly professional journal with a long-standing history and stable academic tradition, reflecting the evolution of engineering and technical sciences within the agro-industrial sector of Ukraine.
The journal was founded in 1997 under the title Bulletin of Vinnytsia State Agricultural Institute. According to the Resolution of the Presidium of the Higher Attestation Commission of Ukraine dated September 11, 1997, the publication obtained the status of a professional scientific journal, which enabled the publication of the main results of doctoral and candidate dissertations in technical sciences. From its inception, the journal positioned itself as an academic platform for addressing current issues of mechanization, electrification, and technical support of agricultural production.
During 2001–2014, the journal was published under the title Proceedings of Vinnytsia National Agrarian University. Series: Technical Sciences (State Registration Certificate of Print Media KV No. 16644-5116 PR dated April 30, 2010). Throughout this period, a systematic approach to the selection and peer review of scientific manuscripts was established, the thematic scope of publications was expanded, and continuity of scientific directions as well as the development of sectoral engineering schools was ensured.
Since 2015, the journal has been published under its current title, Technology, energy, agriculture transport AIC (State Registration Certificate No. 21906-11806 R dated March 12, 2016). The change of title reflected the expansion of the journal’s thematic coverage and its orientation toward interdisciplinary research in mechanical engineering, energy systems, electrical engineering, transport technologies, automation, and digital solutions for the agro-industrial complex.
The journal consistently adheres to the principles of open science. All published materials are distributed under the Creative Commons Attribution 4.0 International License (CC BY 4.0), ensuring open access to research results provided proper attribution to the authors and the original publication is maintained.
At present, Technology, energy, agriculture transport AIC is an authoritative professional scientific journal (Category B), providing a platform for the publication of fundamental and applied research results, promoting the integration of education, science, and industry, and contributing to the advancement of engineering and technological support of the agro-industrial complex of Ukraine.
