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  1. Article: Development of Mechanical Properties of Stainless Steel 316LN-IG after Cryo-Plastic Deformation.

    Fedoriková, Alica / Petroušek, Patrik / Kvačkaj, Tibor / Kočiško, Róbert / Zemko, Michal

    Materials (Basel, Switzerland)

    2023  Volume 16, Issue 19

    Abstract: The article deals with increasing the mechanical properties of stainless steel 316 Ln-IG, which is intended for work in cryogenic temperatures (liquid nitrogen and liquid helium), such as conductor conduits for the ITER magnet system. The strength and ... ...

    Abstract The article deals with increasing the mechanical properties of stainless steel 316 Ln-IG, which is intended for work in cryogenic temperatures (liquid nitrogen and liquid helium), such as conductor conduits for the ITER magnet system. The strength and plastic properties were increased by a combination of cold and cryo-rolling and heat treatment. The mechanical properties of rolled material were investigated at 293 K, 77 K, and 4.2 K. The work-hardening rate of the steel increased continuously with a lowering of the temperature. The maximum yield strength and ultimate tensile strength were achieved by the cryo-rolling process with a total thickness deformation of 50%. The material properties tested at ambient temperature were 0.2YS = 1050 MPa, UTS = 1200 MPa, and at 4.2 K, the values were 0.2YS = 1804 MPa and UTS = 2081 MPa. Two types of long-term heat treatment were applied after experimental rolling (823 K and 1093 K for 10 h). The highest precipitation hardening of steel was achieved at a temperature of 823 K after 50% deformation. The resulting grain size decreased from the initial 216 μm (before the rolling process) to 70 μm after ambient rolling and 72 μm after cryo-rolling.
    Language English
    Publishing date 2023-09-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma16196473
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Agricultural utilisation and potential suitability of the Sysľovské polia Special Protection Area (south-western Slovakia) landscape in relation to the habitat requirements of the red-footed falcon (Falco vespertinus)

    Zemko, Martin / Petluš, Peter / Petlušová, Viera

    Slovak raptor journal. 2017 Dec. 1, v. 11, no. 1

    2017  

    Abstract: Intensification of land use in an agricultural landscape significantly affects biodiversity also in protected areas. This can be observed in the Sysľovské polia Special Protection Area in relation to the occurrence of the red-footed falcon (Falco ... ...

    Abstract Intensification of land use in an agricultural landscape significantly affects biodiversity also in protected areas. This can be observed in the Sysľovské polia Special Protection Area in relation to the occurrence of the red-footed falcon (Falco vespertinus). The objective of this study was to evaluate the landscape structure and suitability of agrotechnical procedures for the habitat demands of this species in the course of the period from 2004 until 2017. The utilisation was assessed on the basis of four landscape elements representation in 1949 and 2017. The next step was analysis of landscape patches. The aim was to quantify the diversity and the spatial structure of the landscape mosaic using Shannon’s Diversity Index and Evenness Index as well as Simpson’s Diversity Index and Evenness Index and spatial pattern analysis in the Fragstats software programme. Assessment of crop suitability was carried out according to the following criteria: representation of positive/negative agricultural crops, diversity of crops in crop rotation, and (non-)observance of crop rotation. It was found that the agricultural landscape use did not change significantly. The study area has been used as an intensively-farmed agricultural landscape for a long time. The landscape elements have remained almost identical, with dominance of arable land. Differences emerged in the analysis of the micropatches, which are represented by natural hedgerows consisting of various species of trees, shrubs and grasses. The results show a decrease in the diversity of patches and changes in the structure of the landscape patches, which may be important in terms of the preservation of the habitat of fauna which form an important part of the F vespertinus diet. On the basis of the evaluation of the suitability of agricultural crop growing, we found that there were some areas showing negative values in all the criteria, and thus they require changes in the crop rotation focusing on increasing positive crop diversity and the share of grassland.
    Keywords Falco ; agricultural landscapes ; arable soils ; biodiversity ; computer software ; crop rotation ; crops ; diet ; falcons ; fauna ; grasslands ; habitats ; land use ; Slovakia
    Language English
    Dates of publication 2017-1201
    Size p. 69-81.
    Publishing place De Gruyter Open
    Document type Article
    ZDB-ID 2864262-4
    ISSN 1338-7227 ; 1337-3463
    ISSN (online) 1338-7227
    ISSN 1337-3463
    DOI 10.1515/srj-2017-0010
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Influence of Hot Plastic Deformation in γ and (γ + α) Area on the Structure and Mechanical Properties of High-Strength Low-Alloy (HSLA) Steel.

    Sas, Jan / Kvačkaj, Tibor / Milkovič, Ondrej / Zemko, Michal

    Materials (Basel, Switzerland)

    2016  Volume 9, Issue 12

    Abstract: The main goal of this study was to develop a new processing technology for a high-strength low-alloy (HSLA) steel in order to maximize the mechanical properties attainable at its low alloy levels. Samples of the steel were processed using thermal ... ...

    Abstract The main goal of this study was to develop a new processing technology for a high-strength low-alloy (HSLA) steel in order to maximize the mechanical properties attainable at its low alloy levels. Samples of the steel were processed using thermal deformation schedules carried out in single-phase (γ) and dual-phase (γ + α) regions. The samples were rolled at unconventional finishing temperatures, their final mechanical properties were measured, and their strength and plasticity behavior was analyzed. The resulting microstructures were observed using optical and transmission electron microscopy (TEM). They consisted of martensite, ferrite and (NbV)CN precipitates. The study also explored the process of ferrite formation and its influence on the mechanical properties of the material.
    Language English
    Publishing date 2016-11-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma9120971
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Triangle Singularity as the Origin of the a_{1}(1420).

    Alexeev, G D / Alexeev, M G / Amoroso, A / Andrieux, V / Anosov, V / Antoshkin, A / Augsten, K / Augustyniak, W / Azevedo, C D R / Badełek, B / Balestra, F / Ball, M / Barth, J / Beck, R / Bedfer, Y / Berenguer Antequera, J / Bernhard, J / Bodlak, M / Bradamante, F /
    Bressan, A / Burtsev, V E / Chang, W-C / Chatterjee, C / Chiosso, M / Chumakov, A G / Chung, S-U / Cicuttin, A / Correia, P M M / Crespo, M L / D'Ago, D / Dalla Torre, S / Dasgupta, S S / Dasgupta, S / Denisenko, I / Denisov, O Yu / Donskov, S V / Doshita, N / Dreisbach, Ch / Dünnweber, W / Dusaev, R R / Efremov, A / Eversheim, P D / Faccioli, P / Faessler, M / Finger, M / Fischer, H / Franco, C / Friedrich, J M / Frolov, V / Gautheron, F / Gavrichtchouk, O P / Gerassimov, S / Giarra, J / Gnesi, I / Gorzellik, M / Grasso, A / Gridin, A / Grosse Perdekamp, M / Grube, B / Guskov, A / von Harrach, D / Heitz, R / Herrmann, F / Horikawa, N / d'Hose, N / Hsieh, C-Y / Huber, S / Ishimoto, S / Ivanov, A / Iwata, T / Jandek, M / Jary, V / Joosten, R / Jörg, P / Kabuß, E / Kaspar, F / Kerbizi, A / Ketzer, B / Khaustov, G V / Khokhlov, Yu A / Kisselev, Yu / Klein, F / Koivuniemi, J H / Kolosov, V N / Kondo Horikawa, K / Konorov, I / Konstantinov, V F / Kotzinian, A M / Kouznetsov, O M / Koval, A / Kral, Z / Krinner, F / Kulinich, Y / Kunne, F / Kurek, K / Kurjata, R P / Kveton, A / Lavickova, K / Levorato, S / Lian, Y-S / Lichtenstadt, J / Lin, P-J / Longo, R / Lyubovitskij, V E / Maggiora, A / Magnon, A / Makins, N / Makke, N / Mallot, G K / Maltsev, A / Mamon, S A / Marianski, B / Martin, A / Marzec, J / Matoušek, J / Matsuda, T / Mattson, G / Meshcheryakov, G V / Meyer, M / Meyer, W / Mikhailov, Yu V / Mikhasenko, M / Mitrofanov, E / Mitrofanov, N / Miyachi, Y / Moretti, A / Nagaytsev, A / Naim, C / Neyret, D / Nový, J / Nowak, W-D / Nukazuka, G / Nunes, A S / Olshevsky, A G / Ostrick, M / Panzieri, D / Parsamyan, B / Paul, S / Pekeler, H / Peng, J-C / Pešek, M / Peshekhonov, D V / Pešková, M / Pierre, N / Platchkov, S / Pochodzalla, J / Polyakov, V A / Pretz, J / Quaresma, M / Quintans, C / Reicherz, G / Riedl, C / Rudnicki, T / Ryabchikov, D I / Rybnikov, A / Rychter, A / Samoylenko, V D / Sandacz, A / Sarkar, S / Savin, I A / Sbrizzai, G / Schmieden, H / Selyunin, A / Sinha, L / Slunecka, M / Smolik, J / Srnka, A / Steffen, D / Stolarski, M / Subrt, O / Sulc, M / Suzuki, H / Sznajder, P / Tessaro, S / Tessarotto, F / Thiel, A / Tomsa, J / Tosello, F / Townsend, A / Tskhay, V / Uhl, S / Vasilishin, B I / Vauth, A / Veit, B M / Veloso, J / Ventura, B / Vidon, A / Virius, M / Wagner, M / Wallner, S / Zaremba, K / Zavada, P / Zavertyaev, M / Zemko, M / Zemlyanichkina, E / Zhao, Y / Ziembicki, M

    Physical review letters

    2021  Volume 127, Issue 8, Page(s) 82501

    Abstract: The COMPASS Collaboration experiment recently discovered a new isovector resonancelike signal with axial-vector quantum numbers, the a_{1}(1420), decaying to f_{0}(980)π. With a mass too close to and a width smaller than the axial-vector ground state a_{ ... ...

    Abstract The COMPASS Collaboration experiment recently discovered a new isovector resonancelike signal with axial-vector quantum numbers, the a_{1}(1420), decaying to f_{0}(980)π. With a mass too close to and a width smaller than the axial-vector ground state a_{1}(1260), it was immediately interpreted as a new light exotic meson, similar to the X, Y, Z states in the hidden-charm sector. We show that a resonancelike signal fully matching the experimental data is produced by the decay of the a_{1}(1260) resonance into K^{*}(→Kπ)K[over ¯] and subsequent rescattering through a triangle singularity into the coupled f_{0}(980)π channel. The amplitude for this process is calculated using a new approach based on dispersion relations. The triangle-singularity model is fitted to the partial-wave data of the COMPASS experiment. Despite having fewer parameters, this fit shows a slightly better quality than the one using a resonance hypothesis and thus eliminates the need for an additional resonance in order to describe the data. We thereby demonstrate for the first time in the light-meson sector that a resonancelike structure in the experimental data can be described by rescattering through a triangle singularity, providing evidence for a genuine three-body effect.
    Language English
    Publishing date 2021-09-03
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.127.082501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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