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Moravec Ján University of Žilina, Faculty of Mechanical Engineering, Department of Technological Engineering, Univerzitná 8215/1, 010 26 Žilina, Slovak Republic, EU, jan.moravec@fstroj.uniza.sk
DOI: https://doi.org/10.37904/metal.2019.682, 277-282
Abstract:
This paper describes issues related to the process of cutting with a punch with internal heating. The theoretical part explains the effects related to thermal expansion, conduction and transfer of heat in the body of punches. [..]
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ZIDANI Mosbah Université Mohamed Khider Biskra, Laboratoire de Génie Energétique et Matériaux (LGEM) Faculté des Sciences et de la Technologie, Biskra 07000, Algérie.
Co-authors:
NEBBAR Mohamed Chaouki
DJIMAOUI Toufik
MESSAOUDI Salim
FARH Hichem
HELBERT Anne Laure
BRISSET François
BAUDIN Thierry
DOI: https://doi.org/10.37904/metal.2019.683, 344-348
Abstract:
The medium carbon steel drawn wires are used in wide variety of applications, such as bridge cables, tire cord and springs. Wire drawing is a cold working process. [..]
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BEHRENS Bernd-Arno Leibniz Universität Hannover, Institute of Forming Technology and Machines, An der Universität 2, 30823 Germany, EU, bohne@ifum.uni-hannover.de
Co-authors:
CHUGREEV Alexander
JALANESH Masood
WÖLKI Kai
BOHNE Florian
DOI: https://doi.org/10.37904/metal.2019.684, 320-325
Abstract:
Hot stamping has become an established technology for the production of high strength steel parts in the automotive industry. The sheets are heated up to temperatures over austenitization temperature and held in order to obtain a fully austenised microstructure, formed and subsequently quenched. [..]
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NAIZABEKOV Abdrakhman Rudny Industrial institute, Rudny, Kazakhstan, sergey_legnev@mail.ru
Co-authors:
LEZHNEV Sergey
ARBUZ Alexandr
PANIN Yevgeniy
DOI: https://doi.org/10.37904/metal.2019.685, 283-288
Abstract:
The article presents the results of the study of the microstructure and mechanical properties of austenitic stainless steel AISI-321 after radial-shear rolling. The studies carried out in this work allowed to prove the possibility of obtaining the ultra-fine-grained structure in long-length blanks of austenitic stainless steel
AISI-321 after radial-shear rolling, as well as to achieve a significant increase in the initial mechanical properties of this steel. [..]
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MESSAOUDI Salim Mohamed Khider Biskra University, Laboratory of Energy and materials Engineering, Faculty of Science and Technology, PB145, Biskra, Algeria, salim_messaoudi@yahoo.fr
Co-authors:
DJIMAOUI Toufik
ZIDANI Mosbah
NEBBAR Mohamed Chaouki
MATHON Marie Hélène
HELBERT Anne-Laure
BRISSET François
BAUDIN Thierry
DOI: https://doi.org/10.37904/metal.2019.686, 338-343
Abstract:
In this study we present an analysis of the evolution of the texture of a mild steel welding rod from the initial state to the welded state. And thus show the effect of drawing on the texture of the welded metal.The analysis of the initial state reveals the presence of a slight texture of the ferritic phase at the periphery. [..]
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CONSTANTINESCU Dan University Politehnica of Bucharest, Bucharest, Romania, EU, dconstantinescu@ecomet.pub.ro
DOI: https://doi.org/10.37904/metal.2019.687, 302-308
Abstract:
The present paper does not have in view the impact of metallurgical industry on the environment. We have in view some thermal models, used in the case of solid bodies like for example the steel, in order to analyze similar phenomena in the nature and the effect on the climate changes. [..]
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ÇETİN Barış FNSS Defense Systems Co. Inc., Engineering and Research Department, Ankara, Turkey, cetin.baris@fnss.com.tr
Co-authors:
BİLLUR Eren
BARANOĞLU Besim
TOPTAŞ Uğur
ALIÇ Özgür
DOI: https://doi.org/10.37904/metal.2019.688, 242-247
Abstract:
In bending of plates, unlike the case of sheet metal forming, a 3-D stress state is valid. Moreover, apart from the some very specific cases, the plane strain assumption is not appropriate either. [..]
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KRÁTKÁ Ludmila VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, ludmila.kratka@vsb.cz
Co-authors:
MACHŮ Mario
DOI: https://doi.org/10.37904/metal.2019.689, 309-313
Abstract:
The study focused on numerical and experimental investigations of steel head restraint produced via the technology of cold rotary swaging. The analyses were carried out via finite element modelling and experimental swaging; the whole study was supplemented with 3D scanning. [..]
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Fabík Richard VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU
Co-authors:
Molnár Jakub
Santarius Tomáš
DOI: https://doi.org/10.37904/metal.2019.690, 332-337
Abstract:
The paper deal with experience with the introduction of production of ribbed wire from B500B steel on the cold stretching line KOCH in ArcelorMittal Ostrava. The basic principle of work hardening during cold stretching is introduced. [..]
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Kawulok Rostislav VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, rostislav.kawulok@vsb.cz
Co-authors:
ŠKANDERA David
KAWULOK Petr
SCHINDLER Ivo
KUBINA Tomáš
ŠEVČÁK Vojtěch
DOI: https://doi.org/10.37904/metal.2019.691, 289-295
Abstract:
Based on dilatometry tests, the effect of various values of previous deformation on the kinetics of austenite transformations during the cooling of P620Q steel has been studied. Dilatometry tests have been performed with the use of the optical dilatometry module of the plastometer Gleeble 3800. [..]
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PARILÁK Ľudovít ZP Research and Development Centre, 976 81 Podbrezova, Slovak Republic, EU, parilak@zelpo.sk
Co-authors:
BELLA Peter
DOI: https://doi.org/10.37904/metal.2019.692, 224-228
Abstract:
Cold drawing is the final process of plastic deformation in the manufacture of precision steel seamless tubes. This particular technology is utilities by multiple drawing operations (sequences) with intermediate heat treatment. [..]
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BEHRENS Bernd-Arno Leibniz Universität Hannover, Institute of Forming Technology and Machines, Garbsen, Germany, EU, buedenbender@ifum.uni-hannover.de
Co-authors:
VOLK Wolfram
CHUGREEV Alexander
TILL Michael
MAIER Daniel
BÜDENBENDER Christoph
DOI: https://doi.org/10.37904/metal.2019.693, 296-301
Abstract:
The development of tools in bulk metal forming for the production of steel components consists of an iterative development process and requires a large number of test tools, resulting in high costs as well as increased production time. The simulation of process steps on the basis of the finite element method is an established technique for tool design and provides a significant contribution to the optimization of processes in the development phase. [..]
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ŠEVČÁK Vojtěch VŠB – Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic, ivo.schindler@vsb.cz
Co-authors:
SCHINDLER Ivo
KAWULOK Petr
NAVRÁTIL Horymír
TUROŇ Rostislav
BENČ Marek
DOI: https://doi.org/10.37904/metal.2019.694, 349-354
Abstract:
Comparison of (D)CCT diagram of studied steels. Selected steels are used for manufacturing seamless tubes. [..]
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RESL Ondřej Brno University of Technology, Faculty of Mechanical Engineering, Brno, Czech Republic, EU, ondrej.resl@vut.cz
Co-authors:
POHANKA Michal
DOI: https://doi.org/10.37904/metal.2019.695, 355-360
Abstract:
Steel products like hot rolled steel plates or strips are widely used in industry or in other fields of human activity. Prediction and control of cooling during hot rolling are necessary to obtain the desired mechanical properties of the hot rolled steel. [..]
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BEHRENS Bernd-Arno Leibniz Universität Hannover, Institute of Forming Technology and Machines, An der Universität 2, 30823 Garbsen, Germany, EU, hootak@ifum.uni-hannover.de
Co-authors:
CHUGREEV Alexander
HOOTAK Maiwand
DOI: https://doi.org/10.37904/metal.2019.696, 361-366
Abstract:
The present contribution deals with numerical investigations of a challenging forming process called thixoforming. This technology takes advantage of the semi-solid material state in order to produce geometrically complex parts. [..]
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SASAKI Shunsuke JFE Steel Corporation, Aichi, Japan, shu-sasaki@jfe-steel.co.jp
Co-authors:
KATSUMURA Tatsuro
DOI: https://doi.org/10.37904/metal.2019.697, 248-253
Abstract:
The influence of the cooling rate immediately before hot working on the flow stress and microstructure of δ ferrite-austenite duplex stainless steel (25 % Cr duplex stainless steel) was investigated by a hot compression test at 1,000 – 1,200 °C with various strain rates (0.1 to 10.0 s-1). In spite of the fact that the compression temperature was the same, the condition of rapid cooling immediately before the hot compression test greatly reduced the maximum flow stress σmax and work-hardening coefficient n values. [..]
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BEHRENS Bernd-Arno Institute of Forming Technology and Machines (IFUM), Leibniz University Hannover, An der Universität 2, 30823 Garbsen, Germany, malik@ifum.uni-hannover.de
Co-authors:
CHUGREEV Alexander
BONHAGE Martin
BÜDENBENDER Christoph
ZAITSEV Aleksandr
MALIK Irfan Yousaf
DOI: https://doi.org/10.37904/metal.2019.698, 326-331
Abstract:
Tools in hot forging processes undergo high thermal and mechanical loads and thus experience corresponding fatigues. Mechanical fatigue can be reduced by design optimization, but process related changes are needed in order to minimize the thermal fatigue. [..]
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JABŁOŃSKA Magdalena VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, stanislav.rusz@vsb.cz
Co-authors:
KOWALCZYK Karolina
RUSZ Stanislav
BEDNARCZYK Iwona
DOI: https://doi.org/10.37904/metal.2019.699, 229-234
Abstract:
This article presents the impact of continuous plastic deformation SPD with the DRECE technique on a structure and properties of low carbon IF steel. The impact of numbers of passes on a change of mechanical properties of tested steel, such as tensile strength TS and yield strength YS, was tested. [..]
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PESIN Alexander Nosov Magnitogorsk State Technical University, Magnitogorsk, Russian Federation, pesin@bk.ru
Co-authors:
CHIKISHEV Denis
PUSTOVOYTOV Denis
LOKOTUNINA Natalya
DOI: https://doi.org/10.37904/metal.2019.700, 254-258
Abstract:
The analysis of the causes of the ski-effect of the sheet in the hot rolling conditions in the plate mill 5000 was performed. Influence of kinematic, thermal and geometrical factors on the occurrence of the ski-effect of the sheet were investigated. [..]
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PUSTOVOYTOV Denis Nosov Magnitogorsk State Technical University, Magnitogorsk, Russian Federation, pustovoitov_den@mail.ru
Co-authors:
PESIN Alexander
LOKOTUNINA Natalya
KOZHEMIAKINA Anna
DOI: https://doi.org/10.37904/metal.2019.701, 265-270
Abstract:
Creating of gradient structures with the grain size changing from microns to nano-scale through the thickness of processed metallic materials represents a new advanced strategy for producing a superior combination of high strength and good ductility. Severe plastic deformation with predetermined strain gradient can be considered as a mechanism of creating of gradient structures. [..]
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