Metallurgist最新文献_第2页

Effect of nonmetallic inclusions and phase precipitates on the fatigue fracture resistance of low-carbon microalloyed steels

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-12-11 DOI: 10.1007/s11015-024-01822-2

N. A. Arutyunyan, A. V. Koldaev, A. B. Stepanov, S. F. Dunaev

引用次数: 0

Mechanical properties of extra thick-walled shells from grade T wheel steel obtained by the screw piercing process

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-12-11 DOI: 10.1007/s11015-024-01823-1

V. P. Romanenko, A. V. Fomin, A. A. Sevastyanov, G. A. Filippov, O. V. Livanova, D. R. Radzhabov

引用次数: 0

Testing of the technology for processing the slag of a precious metal shop in a rotary-type unit

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-12-11 DOI: 10.1007/s11015-024-01836-w

B. L. Demin, E. N. Shcherbakov, A. E. Shcherbakov

{"title":"Testing of the technology for processing the slag of a precious metal shop in a rotary-type unit","authors":"B. L. Demin, E. N. Shcherbakov, A. E. Shcherbakov","doi":"10.1007/s11015-024-01836-w","DOIUrl":"10.1007/s11015-024-01836-w","url":null,"abstract":"<div><p>This paper presents the results of the testing of the technology for processing liquid slags of a precious metal shop in a rotary-type unit. The main feature of the unit is its ability to process metallurgical slag in a liquid state to obtain a product with a wide range of properties and purposes. The technical characteristics of the pilot plant are given. The peculiarities of cooling high-temperature slag melts on moving metal bodies placed on grates forming a cylindrical surface are presented. Metal bodies (spheres) can move along the grate surface and simultaneously extract the heat of the slag melt. To control the cooling process, the design of the unit provides systems for supplying and distributing water and removing a combined-cycle gas mixture. The grate surface in the form of a rotor is covered with a heatproof and soundproof casing, which is connected to a steam–gas mixture removal system. The melt cooled in the rotor cavity enters the trough conveyor. The conveyor is also covered with a casing and connected to the steam–gas mixture removal system. Examples of different modes of slag melt cooling in a rotary-type unit are presented. A variant of discharging cooled slag directly under the rotor into a special box equipped with a sewage drainage system is tested. Satisfactory results can be achieved in obtaining crushed stone and crushed stone–sand mixtures with the required properties directly from slag melts.</p></div>","PeriodicalId":702,"journal":{"name":"Metallurgist","volume":"68 8","pages":"1261 - 1266"},"PeriodicalIF":0.8,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of constructive and geometric parameters of lightning protection cable with optical communication module

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-12-11 DOI: 10.1007/s11015-024-01828-w

L. M. Gurevich, V. F. Danenko

{"title":"Optimization of constructive and geometric parameters of lightning protection cable with optical communication module","authors":"L. M. Gurevich, V. F. Danenko","doi":"10.1007/s11015-024-01828-w","DOIUrl":"10.1007/s11015-024-01828-w","url":null,"abstract":"<div><p>In recent years, lightning protection cables with integrated optical module are used fairly extensively. These cables actually have the form of a cable made of several layers of steel wires with corrosion-resistant coating and a tubular case made either of aluminum or of stainless steel (central or in a whip) filled with a hydrophobic gel and optical fibers. Circular plastic compression in the process of production of lightning protection cable with integrated optical module enables us to improve the electric contacts of wires in and between the layers and increase both the resistance to the lightning discharge impulse and mechanical strength. For the incorrectly chosen geometric parameters of wires in the first and second layers, circular plastic compression may lead to a significant deformation of the optical module and, as a result, to the unacceptable elevation of the coefficient of attenuation of the transmitted signal. By the method of computer simulation, we determine the value of guaranteed gap between the inner layer of the lightning protection cable with integrated optical module and the central tube guaranteeing the decrease in the level of deformation of the outer shell of the optical module down to admissible values. The possibility of formation of lateral contacts between the wires of the first layer contributing to a decrease in the radial component of pressure transmitted to the surface of the module is demonstrated for the optimized design of the cable. The accumulated results of computer simulation can be used for the optimization of the design and geometric parameters and the level of strand compression required to minimize the deformation of the outer shell of central tube of the integrated optical module of the lightning protection cable.</p></div>","PeriodicalId":702,"journal":{"name":"Metallurgist","volume":"68 8","pages":"1184 - 1192"},"PeriodicalIF":0.8,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effects of scandium, yttrium, and lanthanum on corrosion and electrochemical properties of zinc alloy ZAMg4.5-2

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-12-11 DOI: 10.1007/s11015-024-01834-y

I. Sh. Idiev, M. T. Norova, I. N. Ganiev

引用次数: 0

Electric arc welding of parts made from EK-61 powder alloy by direct laser deposition

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-12-03 DOI: 10.1007/s11015-024-01831-1

Rashit A. Latypov, Dmitry K. Starovoytov, Konstantin I. Nedashkovsky, Elena V. Voronkova, Dmitry S. Semenov

引用次数: 0

Optimal-packing models in problems of determining the porosity of agglomerated products

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-12-03 DOI: 10.1007/s11015-024-01832-0

Aitber M. Bizhanov

{"title":"Optimal-packing models in problems of determining the porosity of agglomerated products","authors":"Aitber M. Bizhanov","doi":"10.1007/s11015-024-01832-0","DOIUrl":"10.1007/s11015-024-01832-0","url":null,"abstract":"<div><p>The sphere packing theory is used to study the influence of the particle-size distribution in the material on the porosity of briquettes and pellets, and the fractional composition of agglomerated products on the porosity of layers of such charge components. Understanding how the porosity of agglomerates varies with the particle-size distribution in the starting material, it is possible to optimize the metallurgical properties of briquette and pellets. The porosity of a layer of such products largely determines their behavior during both reduction (in blast furnaces, ore-thermal furnaces, and direct-reduction reactors) and pellet firing. The results obtained made it possible to identify for the first time the local extrema in the porosity of agglomerates and the porosity of a layer of pellets (briquettes). The developed heuristic approach can be used for optimizing the composition of mixtures for agglomeration, increasing the efficiency of pellet firing, and achieving high degrees of metallization in reducing an agglomerated charge. This approach accounts for the compressibility and shape irregularity of particles in both starting mixture and agglomerated products.</p></div>","PeriodicalId":702,"journal":{"name":"Metallurgist","volume":"68 8","pages":"1223 - 1230"},"PeriodicalIF":0.8,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation of optimal slag composition in ladle furnace for improvement of desulfurization properties and optimization of consumption of slag-forming materials 在钢包炉中形成最佳炉渣成分，以改善脱硫性能并优化成渣材料的消耗量

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-11-08 DOI: 10.1007/s11015-024-01805-3

A. A. Metelkin, O. Yu. Sheshukov, M. V. Saveliev, D. K. Egiazaryan, A. S. Tkachev, V. Yu. Elin

引用次数: 0

Thermobarrier and antifriction properties of triboceramics on the surface of a cutting tool with (TiAlCrSiY)N/(TiAlCr)N coating during high-speed dry cutting 带 (TiAlCrSiY)N/(TiAlCr)N 涂层的切削工具表面摩擦陶瓷在高速干切削过程中的隔热性能和抗摩擦性能

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-11-08 DOI: 10.1007/s11015-024-01809-z

A. I. Kovalev, D. L. Wainstein, E. P. Konovalov, V. O. Vakhrushev, S. A. Dmitrievskii, A. A. Tomchuk

{"title":"Thermobarrier and antifriction properties of triboceramics on the surface of a cutting tool with (TiAlCrSiY)N/(TiAlCr)N coating during high-speed dry cutting","authors":"A. I. Kovalev, D. L. Wainstein, E. P. Konovalov, V. O. Vakhrushev, S. A. Dmitrievskii, A. A. Tomchuk","doi":"10.1007/s11015-024-01809-z","DOIUrl":"10.1007/s11015-024-01809-z","url":null,"abstract":"<div><p>The physical mechanism of self-organization of a multilayer nanolaminated coating based upon non-equilibrium (TiAlCrSiY)N/(TiAlCr)N nitride on a cutting tool during high-speed (600 m/min.) dry cutting of N13 steel is established. Using a set of modern surface analysis methods coating degradation and tribo-oxidation are studied within the running-in and steady stages of wear. It is shown that during cutting, amorphous-nanocrystalline films of oxides similar to Cr<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> (sapphire) and Al<sub>2</sub>O<sub>3</sub> · 2 (SiO<sub>2</sub>) (mullite) are formed within a wear crater. Using computer calculations by a finite element method, heat transfer is considered in the cutting zone during formation of protective tribo-oxides. It is found that among all tribo-oxides, mullite has the best thermal barrier properties. Oxidation is the main adaptation mechanism of a cutting tool under extreme mechanical and thermal shock during high-speed cutting. The topography of chip contact surface is studied at various cutting stages, which makes it possible to establish a change in plastic deformation mechanisms of treated metal and friction cutting modes. Quantum chemical calculations of the electron structure of mullite show the highest degree of its electron polarization and explain the radical drop in friction coefficient during film formation upon a wear surface. In this case, mullite acts as a solid lubricant.</p></div>","PeriodicalId":702,"journal":{"name":"Metallurgist","volume":"68 7","pages":"1001 - 1010"},"PeriodicalIF":0.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bumps on metallographic specimens of Fe29%Ni18%Co alloy sheets as a rejection criterion 将铁29%镍18%钴合金板金相试样上的凹凸作为剔除标准

IF 0.8 4区材料科学

Metallurgist Pub Date : 2024-11-07 DOI: 10.1007/s11015-024-01814-2

P. A. Golovkin

{"title":"Bumps on metallographic specimens of Fe29%Ni18%Co alloy sheets as a rejection criterion","authors":"P. A. Golovkin","doi":"10.1007/s11015-024-01814-2","DOIUrl":"10.1007/s11015-024-01814-2","url":null,"abstract":"<div><p>The causes of the formation of bumps on metallographic specimens of sheets and strips subject to inspection are established by analyzing the components of Kovar alloy (trademarked name of Fe29%Ni18%Co precision alloy; named 29NK-VI in Russia) and identifying possible deviations from its manufacturing process, starting from the preparation of the initial melt. It was found out that the formation of bumps is a manifestation of leading diffusion of some alloy components into others, mainly cobalt into nickel. Such a phenomenon may occur in case of significant chemical inhomogeneity of the metallic material caused by the segregation of the components of its initial melt according to their magnetic susceptibility and the refusal to homogenize the resulting ingot.</p><p>It is argued that bumps on specimens should be considered as a rejection criterion for a material intended for the manufacture of precision parts of vacuum electronic devices, as they are indicative of its unbalanced composition. The residual diffusion phenomena contribute to the change in the phase state of the material, followed by embrittlement, change in precise dimensions, and loss of vacuum in parts of vacuum electronic devices. It is assumed that residual diffusion is one of the causes of the γ→α phase transformation in Kovar at low temperatures.</p></div>","PeriodicalId":702,"journal":{"name":"Metallurgist","volume":"68 7","pages":"1050 - 1058"},"PeriodicalIF":0.8,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142636878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0