Russian Metallurgy (Metally)最新文献

{"title":"Influence of Chemical Composition on the Structural-Phase State and the Adhesive Strength of Metal-Composite Briquettes for the Friction Draft Gears and the Brake Pads of Heavy Vehicles","authors":"S. A. Gavrilov,&nbsp;D. A. Gabets,&nbsp;M. A. Gur’ev,&nbsp;S. G. Ivanov","doi":"10.1134/S0036029525700545","DOIUrl":"10.1134/S0036029525700545","url":null,"abstract":"<p>The main requirements imposed on the friction plates and brake linings of heavy vehicles are resistance to shock loads and thermal cycles in the temperature range from ambient temperature to 850–870°C, stability of the coefficient of friction, lack of adhesion to the material of brake disks made of steel or cast iron, and the maximum possible specific energy consumption of brake pad materials. In this work, metallographic studies using optical microscopy are carried out, and the unsatisfactory quality of the metal-ceramic coating of a friction plate is found to be due to the localization of sulfide eutectic at the ceramic–substrate interface and the presence of oxide films on the surface of precursor powder particles, which in turn leads to the formation of a porous ceramic–substrate interface. Metallographic analysis of the effect of various microadditives on the powder precursor used for the formation of metal composite plates, such as copper, nickel, and iron powders of various fractions, has been carried out. The fractional composition of the added powders is shown to largely determine the structural-phase state of the material and the adhesive strength of the ceramic–substrate interface.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 11","pages":"1941 - 1944"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon–Aluminum Composite with a Barrier Coating on Carbon Fibers","authors":"R. F. Gallyamova,&nbsp;R. L. Safiullin,&nbsp;V. A. Dokichev,&nbsp;F. F. Musin","doi":"10.1134/S0036029525700491","DOIUrl":"10.1134/S0036029525700491","url":null,"abstract":"<p>Barrier SiO₂ coatings on the surface of carbon fibers are deposited by the dip coating method from sol–gel solutions based on tertraethoxysilane Si(C₂H₅O)₄. The average thickness of the barrier SiO₂ coating on carbon fibers is 127 ± 30 nm. Carbon–aluminum composites are prepared by the shell molding process, being a variety of the liquid-phase infiltration method. The components of the composite are placed in a steel hermetic shell. After shell evacuating and heating to aluminum melting, the fibers are infiltrated with the melt under an external pressure followed by cooling. Composites with the SiO₂ coating on the carbon fibers and without coating are prepared. After taking the composite from the metal shell, the structure, phase composition, and mechanical properties of the samples are studied. The study of the composite structure shows that the interfiber space is filled with an aluminum melt without porosity and macroscopic defects. The study of the phase composition of the composite reinforced with uncoated carbon fibers shows peaks of aluminum carbide at the angles 2θ = 41°, 67°, and 74°. The Rietveld quantitative analysis reveals that the amount of aluminum carbide in the composite is 12.0 ± 1.3%. The deposition of the barrier SiO₂ coating on carbon fibers leads to a decrease in the intensity of the main peaks of aluminum carbide, while the amount of Al₄C₃ decreases by 4 times (to 3.0%). An analysis of the fracture surface of the samples after mechanical tests reveals that the fracture surface of the composite reinforced with uncoated carbon fibers is almost planar. No protrusions and no relief are observed on the fracture surface. The fracture surface of the composite reinforced with coated carbon fibers has a relief, and separately sticking out fibers are observed. Mechanical three-point bending tests of the samples show that the barrier coating on the fibers increases the strength to 520 ± 50 MPa, and the strength of the uncoated composite is 350 ± 8 MPa. The barrier SiO₂ coating deposited on the carbon fiber surface prevents the formation of aluminum carbide and fiber degradation in the carbon–aluminum composite.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 10","pages":"1909 - 1915"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Localization Effects in Static Disorder Metals as a Precursor of Non-Fermi-Liquid Behavior in the Strange Metal Mode: Spectroscopic Ellipsometry Study of Disordered β-Ta Films and Multilayer (FeNi–Ta)N Structures","authors":"N. N. Kovaleva","doi":"10.1134/S0036029525700478","DOIUrl":"10.1134/S0036029525700478","url":null,"abstract":"<p>To refine the nature of the state in the “strange metal” (SM) mode, which occurs in a wide variety of materials from high-temperature superconductors to heavy fermion metals, we elaborate spectroscopic ellipsometry in addition to the widely used shot noise measurement technique. β-Ta and other “bad” metals can be considered as SMs in an extreme regime, since they are characterized by a negative temperature coefficient of resistivity over a wide temperature range. Using optical studies of β-Ta films and (FeNi–Ta)_<i>N</i> magnetic superlattices, we show that the Drude contribution of free charge carriers at the Fermi level in the 5<i>d t</i>_2<i>g</i> Ta electron band decreases with increasing disorder in β-Ta films due to the localization of free electron charge carriers. Simultaneously, optical bands, which are characteristic of systems with strong electron correlations at which the optical spectral weight is compensated, appear in the energy range ~2–4 eV. In addition, the study of (FeNi–β-Ta)_<i>N</i> magnetic superlattices demonstrates that the ferromagnetic interaction between the neighboring FeNi magnetic layers via a Ruderman–Kittel–Kasuya–Yosida–type (RKKY) mechanism leads to electron delocalization from localized states.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 10","pages":"1886 - 1896"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Operational Evaluation of Metalworking Tools and the Requirements for Them","authors":"A. A. Shmatov,&nbsp; Mei Shunqi","doi":"10.1134/S0036029525700557","DOIUrl":"10.1134/S0036029525700557","url":null,"abstract":"<p>A comparative evaluation of the work of abrasive, cutting, and die metalworking tools is made, and the requirements for their basic operational properties are formulated. Two main causes for the failure of metalworking tools have been revealed: their brittle and plastic fracture. The following methods of improving the working capacity of tools are proposed: (1) thermochemical treatment for producing superhard carbide coatings, (2) thermohydrochemical treatment for producing solid lubricating coatings, and (3) volume strengthening thermal cyclic treatment.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 11","pages":"1945 - 1950"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Automatic Arc Welding Conditions on the Geometric Parameters of Low-Carbon Steel Welded Butt Joints Made Using an Experimental Flux","authors":"E. A. Startsev,&nbsp;P. V. Bakhmatov","doi":"10.1134/S0036029525700521","DOIUrl":"10.1134/S0036029525700521","url":null,"abstract":"<p>The metallurgical industry in the Russian Federation has accumulated a significant amount of slags produced during the manufacture of steels and cast iron. The presence of slag dumps adversely affects the ecology of regions with metallurgical enterprises. During the reduction of iron from slags, an oxide agglomerate becomes a by-product, which can be considered as a flux composition for arc welding/surfacing under a flux layer, fillers for powder wires, and coatings for welding electrodes. The purpose of this work is to study the possibility of arc welding using the flux developed in this work and to determine the optimum welding conditions that ensure the geometric parameters of a weld according to GOST 8713–79 and the required quality of the welded joint (absence of internal defects). The butt-welded joints of 5-mm-thick VSt3sp sheet steel are studied; they were formed by automatic dc welding under a flux layer with forced formation of a root bead on ceramic linings using the flux from the processed metallurgical slag of an electric steelmaking enterprise. Automatic welding of flat samples is carried out on a tractor-type ADF-1250 welding machine using a wire 3 mm in diameter at a constant welding speed of 54 cm/min by varying the current and the arc voltage in the range 400–600 A and 27–37 V, respectively. The research methods are as follows: the estimation of the quality of welded joints by visual measuring and X-ray inspection and the determination of the deformation of samples by laser scanning and computer processing of 3D models. Statistical modeling is performed in the form of a two-factor experiment to obtain adequate regression equations for the effect of welding conditions on the geometric parameters of the weld, namely, the reinforcement height and the weld width on the front and back of a welded joint. The possibility of producing welding fluxes from the metallurgical slags of an electric steelmaking enterprise and their use to create welded joints is shown. The optimum conditions for arc welding of thin-walled sheet parts made of low-carbon steel with forced formation of a root bead on ceramic linings have been determined to ensure the absence of internal defects in the form of pores, cracks, and imperfections; the minimum residual deformations; and compliance of the weld size with the requirements of the existing standard. The nominal geometric parameters of a weld according to GOST 8713-79-S4 correspond to the following welding conditions: the welding speed is 54 cm/min, the welding current 550 A, and the arc voltage is 30 V. The results obtained can be applied in metallurgical electric steelmaking enterprises producing low-carbon steel for the development of technologies using welding materials from slag.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 11","pages":"1925 - 1933"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adhesion Strength of Titanium Nitride Coatings on 20Kh13 Steel","authors":"V. M. Yurov,&nbsp;A. T. Berdibekov,&nbsp;S. A. Guchenko,&nbsp;V. V. Gruzin","doi":"10.1134/S003602952570051X","DOIUrl":"10.1134/S003602952570051X","url":null,"abstract":"<p>Primary nanocracks appear in 20Kh13 steel due to the state of stress associated with the relaxation of its surface. The nanocrack size is 1.21 nm. After 100 ns or more, these nanocracks transform 121-nm mesocracks. When titanium nitride is ion-plasma sprayed, its ions diffuse into the steel and form an interphase (transition) layer about 130 nm (121 nm) in size. The size of this layer is experimentally measured on the cleavage of a turbine blade using a MIRA 3 (TESCAN) electron microscope and a Quanta 200 3D system. A TiN coating with a hardness <i>H</i>_TiN ≈ 21 000 MPa is at the top of this layer. 20Kh13 steel with an ultimate tensile strength σ_u = 830 MPa is at the bottom of this layer. <i>H</i> ≈ 3000 MPa of the transition layer should be called the adhesion strength of the titanium nitride coating on a turbine blade made of 20Kh13 steel. To separate the TiN coating from the 20Kh13 steel, it is necessary to do the work of adhesion <i>W</i>_a = 2.620 J/m², which gives σ_a = 2260 MPa for the stress in the transition layer. This stress in the transition layer is close to <i>H</i> ≈ 3000 MPa. This means that we propose a model of primary cracks, which can be used to estimate adhesion strength theoretically.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 11","pages":"1920 - 1924"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Properties of an FeWCrMoBC Metallic Glass Coating on Grade 35 Steel","authors":"A. A. Burkov,&nbsp;L. A. Konevtsov,&nbsp;M. I. Dvornik,&nbsp;S. V. Nikolenko,&nbsp;M. A. Kulik","doi":"10.1134/S0036029525700533","DOIUrl":"10.1134/S0036029525700533","url":null,"abstract":"<p>To deposit metallic glass coatings, it is necessary to achieve high melt cooling rates. The FeWCrMoBC composition has a high melt viscosity and a sufficient glass-forming ability to fix an amorphous state at the cooling rates achieved during electrospark alloying using a crystalline electrode. The purpose of the work is to perform single-stage deposition of an amorphous coating by electrospark alloying using an as-cast FeWCrMoBC crystalline anode and to study the properties of the modified surface of grade 35 steel, namely, wettability, heat resistance, and tribological properties. The structures of the anode and the deposited coatings were studied by X-ray diffraction analysis using Cu<i>K</i>α radiation on a DRON-7 diffractometer. Unlike the X-ray diffraction patterns of the anode material, the X-ray diffraction patterns of the coatings do not have sharp Bragg reflections and have a rather wide halo in the angular range 2θ = 40°–50°, which indicates their amorphous structure. Cyclic heat resistance tests are carried out at a temperature of 700°C for 100 h. The wear resistance and coefficient of friction of samples are studied during dry sliding friction at a speed of 0.47 m/s and a load of 25 N relative to a counterbody made of R6M5 high-speed steel. The effect of electric pulse ratio on the character of mass transfer (anode erosion, cathode increment, mass transfer coefficient) during coating formation is investigated. When the discharge pulse ratio decreases by 9 times, the erosion of the anode increases by 5 times and the cathode weight increment increases by 2.2 times. The maximum mass transfer coefficient is achieved at the highest pulse ratio. The following surface properties of grade 35 steel increase after coating deposition: the surface hardness of the samples increases by 2.3–2.6 times the average coating thickness is in the range 56–80.6 μm, the contact angle is in the range 108.4°–121.3°, the coefficient of friction decreases by 1.2–1.4 times, the wear resistance increases by 2–3.3 times, and the oxidizability in air decreases by 14–18 times. The achieved higher properties (hardness, wear resistance, heat resistance, hydrophobicity) of the operating surfaces of grade 35 steel parts after applying the proposed coatings can be used in various branches of machine-building production. The results obtained confirmed the possibility of deposition of metallic glass coatings onto grade 35 steel by electrospark alloying using an FeWCrMoBC anode material.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 11","pages":"1934 - 1940"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Thermomechanical Treatment of α + β Titanium Alloys VT6 and VT22 on Their Corrosion Resistance","authors":"P. V. Abramova,&nbsp;E. V. Naydenkin,&nbsp;I. V. Ratochka,&nbsp;I. P. Mishin,&nbsp;S. V. Kovaleva,&nbsp;A. V. Korshunov","doi":"10.1134/S003602952570048X","DOIUrl":"10.1134/S003602952570048X","url":null,"abstract":"&lt;p&gt;Titanium and its alloys are among the most durable and corrosion-resistant metallic materials, which determines their wide application in mechanical engineering, aircraft and engine building, chemical apparatus, and medicine. The use of such structural materials with high resistance in aggressive media makes it possible to increase the efficiency of technologies for processing natural raw materials (high-pressure reactors, centrifuges, generators, high-speed pumps, heat exchangers, communications) and the production of chlorine and alkalis (evaporators, electrolysis equipment), organic synthesis (equipment for the production of halogen derivatives), nitric acid, ammonia, and nitrogen fertilizers. A combination of mechanical and thermal treatment of alloys, including the use of severe plastic deformation, can be used to modify their structure and to produce materials with improved physical and mechanical characteristics. The purpose of this work is to determine the effect of various thermomechanical treatment conditions for VT6 and VT22 titanium alloys on their corrosion resistance in aqueous solutions of acids, alkalis, and salts. VT6 and VT22 alloy samples with various structures and aqueous solutions of acids, alkalis, and salts are used for experiments. DC voltammetry, gravimetry under free corrosion conditions, optical microscopy, scanning electron microscopy, X-ray diffraction analysis, and atomic emission spectroscopy are used to analysis. Samples of titanium alloys VT6 (uniform pressing in the temperature range 800–550°C) and VT22 (radial-shear rolling in the temperature range 850–750°C, additional cold rolling of hot-rolled samples, aging at 550°C for 3–6 h) with an ultrafine-grained (UFG) structure are fabricated by severe plastic deformation. The VT6 alloy with an UFG structure is found to have lower corrosion resistance under free corrosion in high-concentration sulfuric acid solutions (5 M) and a 3.5% NaCl solution during anodic polarization in comparison with the initial alloy with a coarse-grained (CG) structure. The main types of corrosion damage to the UFG sample surface are corrosion pits and pitting, and samples with a CG structure are characterized by continuous corrosion. The increase in the rate of corrosion and the morphological features of surface destruction are explained by structural and phase heterogeneity and the segregation of alloying elements as a result of deformation and thermal actions. The corrosion resistance of UFG VT22 samples correlates with the β-phase content and the interphase distribution of alloying elements during the α-Ti &lt;span&gt;( rightleftarrows )&lt;/span&gt; β-Ti polymorphic transformation during thermomechanical treatment of the material. VT22 samples after hot rolling are shown to be most stable in acid solutions (0.1 M HCl, H&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;) and least stable in an alkali solution (0.1 M NaOH) compared to samples treated under other conditions. In a 3.5% NaCl solution, an UFG VT22 sample e","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 10","pages":"1897 - 1908"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Properties of an Epoxy Composite Material Filled with Modified Minerals","authors":"A. Z. Bekeshev,&nbsp;Yu. A. Kadykova,&nbsp;S. G. Kalganova,&nbsp;A. S. Mostovoy,&nbsp;L. K. Tastanova,&nbsp;M. K. Akhmetova,&nbsp;B. O. Sarsenbaev","doi":"10.1134/S0036029525700430","DOIUrl":"10.1134/S0036029525700430","url":null,"abstract":"<p>Dispersed fillers (basalt, chromite) are modified in an induction installation at a power of 2 kW and a processing time of 60 s, which ensures a short-term high-temperature effect of high-frequency (HF) currents on the fillers and, as a result, improves the characteristics of the filled epoxy compounds based on them. The chemical composition of the fillers is found to change, which is associated with the removal of unbound moisture, an oxide film, and the oxides of the substances the decomposition temperature is lower than the modification temperature from the surface of basalt and chromite particles. Electron microscopy data demonstrate that basalt particles acquire a needle-like shape after exposure to HF currents, which positively affects the physicomechanical characteristics, since such a filler exerts a micro-reinforcement effect. Chromite particles weakly change their structure after HF current treatment. The study of the dielectric characteristics of the mineral fillers before and after HF current treatment shows that the dielectric constant increases significantly for basalt and chromite, indicating a change in their structure; this increases the strength characteristics from 7 to 17%.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 9","pages":"1863 - 1867"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Permissible Pipeline Roughness as the Most Important Factor in Ensuring the Quality of Liquid and Gas Transportation","authors":"A. G. Ivakhnenko,&nbsp;M. L. Storublev,&nbsp;O. Yu. Erenkov","doi":"10.1134/S0036029525700508","DOIUrl":"10.1134/S0036029525700508","url":null,"abstract":"<p>Some works are analyzed; the analysis results are used to propose to apply the Reynolds number as an indicator of the quality of a liquid (gas) flow; and the parameters of permissible roughness should be considered among the main quality indicators in a pipeline design. The necessity of updating and refining the existing standards by standardizing of the permissible roughness is substantiated.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2024 11","pages":"1917 - 1919"},"PeriodicalIF":0.4,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}