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A. Zavdoveev,P. Zok,V. Pozniakov,M. Rogante,T. Baudin,M. Heaton,A. Gaivoronskiy,S. Zhdanov,P. Acquier,T. Solomijchuk,V. Kostin1,M. Skoryk,I. Klochkov,S. Motrunich 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Thermomechanically cold processed (TMCP) steels with a high level of strength are actively used in various constructions. The high strength of the TMCP steels is acquired due to the formation of the fine-grained structure. Such steels have relativelylow carbon percentage. These greatly simplify the solution of the problem of improving the quality and reliability of metalstructures. At the same time this raises new questions in terms of the technology for welding such steels. In the first instance,it is conditioned by the complex behavior of the TMCP structure under the welding thermal cycle effect. The most importantproperty of the welded joint is yield stress (YS) which characterizes the workability of the whole joint. The estimation ofthe YS while developing the welding technology is a valuable task for design. This current research has made a complexinvestigation of the modern welding technique's effect on the behavior of the yield stress formation in TMCP steel weldedjoints. For progressive technology development, pulse arc welding was used.
Hamidian, M. H.,Edkins, S. D.,Joo, Sang Hyun,Kostin, A.,Eisaki, H.,Uchida, S.,Lawler, M. J.,Kim, E.-A.,Mackenzie, A. P.,Fujita, K.,Lee, Jinho,Davis, J. C. Sé,amus Nature Publishing Group, a division of Macmillan P 2016 Nature Vol.532 No.7599
<P>The quantum condensate of Cooper pairs forming a superconductor was originally conceived as being translationally invariant. In theory, however, pairs can exist with finite momentum Q, thus generating a state with a spatially modulated Cooper-pair density(1,2). Such a state has been created in ultracold Li-6 gas(3) but never observed directly in any superconductor. It is now widely hypothesized that the pseudogap phase(4) of the copper oxide superconductors contains such a 'pair density wave' state(5-21). Here we report the use of nanometre-resolution scanned Josephson tunnelling microscopy(22-24) to image Cooper pair tunnelling from a d-wave superconducting microscope tip to the condensate of the superconductor Bi2Sr2CaCu2O8+x. We demonstrate condensate visualization capabilities directly by using the Cooper-pair density variations surrounding zinc impurity atoms(25) and at the Bi2Sr2CaCu2O8+x crystal supermodulation(26). Then, by using Fourier analysis of scanned Josephson tunnelling images, we discover the direct signature of a Cooper-pair density modulation at wavevectors Q(P) approximate to (0.25, 0)2 pi/a(0) and (0, 0.25)2 pi/a(0) in Bi2Sr2CaCu2O8+x. The amplitude of these modulations is about five per cent of the background condensate density and their form factor exhibits primarily s or s' symmetry. This phenomenology is consistent with Ginzburg-Landau theory(5,13,14) when a charge density wave(5,27) with d-symmetry form factor(28-30) and wavevector Q(C) = Q(P) coexists with a d-symmetry superconductor; it is also predicted by several contemporary microscopic theories for the pseudogap phase(18-21).</P>
Magnetic field distribution in steel objects with different properties of hardened layer
Byzov, A.V.,Ksenofontov, D.G.,Kostin, V.N.,Vasilenko, O.N. Techno-Press 2022 Advances in computational design Vol.7 No.1
A simulation study of the distribution of magnetic flux induced by a U-shaped electromagnet into a two-layer massive object with variations in the depth and properties of the surface layer has been carried out. It has been established that the hardened surface layer "pushes" the magnetic flux into the bulk of the magnetized object and the magnetic flux penetration depth monotonically increases with increasing thickness of the hardened layer. A change in the thickness and magnetic properties of the surface layer leads to a redistribution of magnetic fluxes passing between the poles of the electromagnet along with the layer and the bulk of the steel object. In this case, the change in the layer thickness significantly affects the magnitude of the tangential component of the field on the surface of the object in the interpolar space, and the change in the properties of the layer affects the magnitude of the magnetic flux in the magnetic "transducer-object" circuit. This difference in magnetic parameters can be used for selective testing of the surface hardening quality. It has been shown that the hardened layer pushes the magnetic flux into the depth of the magnetized object. The nominal depth of penetration of the flow monotonically increases with an increase in the thickness of the hardened layer.
Effect of Pulse Current GMAW on the Yield Stress of the S460M TMCP Steel Welded Joints
A. Zavdoveev,P. Zok,V. Pozniakov,M. Rogante,T. Baudin,M. Heaton,A. Gaivoronskiy,S. Zhdanov,P. Acquier,T. Solomijchuk,V. Kostin,M. Skoryk,I. Klochkov,S. Motrunich 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
Thermomechanically cold processed (TMCP) steels with a high level of strength are actively used in various constructions. The high strength of the TMCP steels is acquired due to the formation of the fine-grained structure. Such steels have relativelylow carbon percentage. These greatly simplify the solution of the problem of improving the quality and reliability of metalstructures. At the same time this raises new questions in terms of the technology for welding such steels. In the first instance,it is conditioned by the complex behavior of the TMCP structure under the welding thermal cycle effect. The most importantproperty of the welded joint is yield stress (YS) which characterizes the workability of the whole joint. The estimation ofthe YS while developing the welding technology is a valuable task for design. This current research has made a complexinvestigation of the modern welding technique's effect on the behavior of the yield stress formation in TMCP steel weldedjoints. For progressive technology development, pulse arc welding was used.