Voprosy Materialovedeniya最新文献

{"title":"On the fatigue strength calculation of the welded shell structures from high-strength steels under low-cycle loading. Part 2: Development of the assessment methodology","authors":"A. Ilyin, K. Sadkin, N. S. Zabavichev","doi":"10.22349/1994-6716-2022-110-2-140-170","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-140-170","url":null,"abstract":"The first part of this work substantiates the procedure for estimating the number of cycles before the appearance of a detectable fatigue crack in weld joints (stress concentrators) which are the usual places of crack occurrence in the absence of major technological defects. It is based on a physical model of the initial stage of fatigue failure, generalized data on the fatigue failure resistance of high-strength steels and their welded joints and FEM calculations. It is reduced to interpolation formulas summarizing the results of numerical modeling. This (second) part of the study presents information necessary to perform practical assessment of fatigue strength in the field of low-cycle loading, including the choice of reserve coefficients when calculating the resource of welded structures. The results of the assessments are compared with the data obtained during fatigue tests of welded joints of large thicknesses performed by multi-pass welding.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81234963","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":"Corrosion resistance of composite NI-P coatings in various aggressive media","authors":"D. S. Polukhin, Y. Goikhenberg, E. G. Bodrov","doi":"10.22349/1994-6716-2022-111-3-98-108","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-98-108","url":null,"abstract":"The paper studies corrosion resistance in highly aggressive media of composite nickel-phosphorus coatings after isothermal annealing at different temperatures accompanied by crystallization. The phase composition of chemically deposited Ni-P coating containing about 1% dispersed SiC was analyzed. Gravimetric method was used to determine the mass loss of the samples as a result of daily exposure to various acids and in a solution of nitric acid with a concentration from 5 to 65%, which is extremely aggressive for Ni-P coatings. At each heat treatment, the steel witness samples were used to determine the microhardness by the Vickers method at a load of 100 g. The dependence of the parameters of the corrosion process on the presence of a dispersed additive and the phase composition of the coating has been established. At low holding times the dispersed phase exhibits a barrier effect reducing crystalline phosphide Ni3P formation during annealing and corrosion resistance; meanwhile, prolonged holding at lower temperatures produces about 70% Ni3P, stable high hardness values and improved corrosion resistance values. Lowering the coating heat treatment temperature in an oxidizing environment reduces the intensity of phosphorus burn-off from the surface and decreases all coating properties. The concentration of nitric acid in the solution at the level of 5-15% is critical and contributes to the dissolution of all coatings, regardless of their composition.The conducted research and revealed regularities made it possible to determine the contribution of the phase composition and presence of the dispersed additive to the formation of the main service characteristics of the nickel-phosphorus coatings - microhardness and resistance to aggressive media, as well as to determine the technological modes of heat treatment that allow the formation of optimum properties of products used in the oil and gas industry.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75545088","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":"Welding of ultra-high molecular weight polyethylene and its composite to increase the sealing of lining coatings","authors":"M. Sokolova, A. A. Chirikov, O. Gogoleva, I. Zyryanov","doi":"10.22349/1994-6716-2022-110-2-102-110","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-102-110","url":null,"abstract":"This article proposes the use of magnetic induction for ultra-high molecular weight polyethylene (UHMWPE) welding. The conducted mechanical and structural studies confirm the high efficiency of the method of welding ultra-high molecular weight polyethylene and its composite using magnetic induction with a ferromagnet in the form of a steel mesh. The chosen optimal welding mode allows obtaining a high-quality weld. It has been established that the preservation of the strength properties of the weld at the selected welding mode at the bulk level of UHMWPE is due to the controlled local heating of the material in the welding zone and increased adhesion at the UHMWPE-metal mesh interface.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87928799","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":"Anodic behavior of gallium doped Zn55Al alloy in acid, neutral and alkaline environments","authors":"M. E. Sirojidinov, I. Ganiev, J. H. Sharipov, Z. Obidov","doi":"10.22349/1994-6716-2022-111-3-79-84","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-79-84","url":null,"abstract":"The paper presents results of potentiostatical and potentiodynamical research of anode behaviour of gallium-doped Zn55Al alloy in acid, neutral and alkaline environments of electrolytes HCl, NaCl and NaOH, at various pH values. Gallium additives (0.01-1.0 wt%) lead to displacement of corrosion electrochemical potential, pitting formation and repassivity to positive values. The results indicate a decrease in the corrosion rate of gallium doped alloys by 2-3 times compared to the base alloy. Such dependence is observed in all investigated corrosion environments.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90943500","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":"Features of the behavior of the dispersion fuel METMET under irradiation","authors":"L. A. Karpyuk, A. M. Savchenko, Y. Konovalov, G. A. Kulakov, S. Maranchak, S. A. Ershov, E. Maynikov, A. Kozlov, A. L. Izhutov, V. Shishin, A. A. Sheldyakov, V. Yakovlev","doi":"10.22349/1994-6716-2022-111-3-148-155","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-148-155","url":null,"abstract":"The paper considers the behavior under irradiation of the METMET fuel composition, which consists of particles of uranium-molybdenum alloy in a matrix of zirconium alloys. Post-reactor investigations confirmed the satisfactory performance of pilot fuel elements irradiated in the MIR reactor to a burnup of 61 MW day/kgU under significant thermal loads. The structural stability of the fuel under irradiation, good compatibility of the fuel rod components with each other could be noted. Fuel rods with METMET fuel composition have good prospects for use in reactors of floating nuclear power units and low-capacity nuclear plants, as well as a tolerant fuel.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76269953","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":"Fracture properties and mechanisms for irradiated austenitic steels over high temperature range and formulation of fracture criterion. Part 2. Fracture criterion and model","authors":"B. Margolin, A. Sorokin, A. Buchatsky, V. A. Shvetsova, V. Fomenko, N. Pirogova","doi":"10.22349/1994-6716-2022-110-2-203-217","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-203-217","url":null,"abstract":"On the basis of experimental data considered in the first part of the paper the fracture criterion and fracture model are represented for high temperature radiation embrittlement of irradiated austenitic steels. The proposed model allows one to explain larger value of the fracture strain for notched cylindrical specimens as compared with smooth specimens as it has been found in the first part of the paper and also to predict fracture toughness over range of high temperature radiation embrittlement. The formulated criterion and model are verified by comparison of the calculated and experimental values of fracture toughness for 18Cr-9Ni steel irradiated up to damage dose of (24–30) dpa. Experimental values of fracture toughness are obtained from compact tension CT-0.5 specimens tested at 200°С and 600°С. The fracture toughness data for irradiated steel are represented also over temperature range from 20°С and 600°С.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88593877","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":"Stability of the Y–Ti–O oxides in reactor materials under neutron irradiation at high temperatures","authors":"A. Frolov, E. Kuleshova, B. Gurovich, A. A. Nikitina, D. Maltsev, S. Fedotova, D. Safonov","doi":"10.22349/1994-6716-2020-104-4-109-130","DOIUrl":"https://doi.org/10.22349/1994-6716-2020-104-4-109-130","url":null,"abstract":"The paper presents the results of electron microscopic studies of ferrite-martensitic steel samples hardened with Y-O oxides, EP-450 DUO in the initial state and after neutron irradiation in the BN-600 reactor at 1000°C to a damaging dose of 77.5 dpa. These studies showed that the main types of oxide phases were Y2(Si, Ti)2O7 and Y2(Si, Ti)O5. These precipitates at sizes less than 10-20 nm were semi-coherent with a ferritic matrix of steel EP-450 DUO with the ratio (110)malrix//(221)palticle. Some of the Y-Ti-O oxides in the initial state were Y2Ti2O7-type with some deviations from the stoichiometric composition.However, after neutron irradiation under BN-600 conditions at temperature ~ 1000°C, oxide particles could not be described by the indicated stoichiometry. Besides, after irradiation, silicon and aluminum were found in the oxide's composition. In the case of taking these elements into account during the construction of a triple composition diagram, it was shown that the oxide phases had Y2(Ti, Si, Al)2O7 and Y2(Ti, Si, Al)O5 types. It was established that in samples of EP-450 DUO steel in the initial state with oxide particles up to 20 nm in size, the yttrium content is generally lower than the titanium concentration. The titanium and yttrium concentrations corresponded to the stoichiometric composition Y2Ti2O7 (1:1) with a further increase in the average diameter of these phases. After irradiation, the situation changed somewhat: the yttrium content in most oxide phases exceeds the total concentration of titanium, silicon, and aluminum.The paper also presents the analysis of porosity and evolution of grain structure in EP-450 DUO steel after neutron irradiation.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75439571","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":"Effects of homogenizing annealing on the reduction of crack formation in forgings of steel grade 08Kh18N10T","authors":"M. I. Olenin, O. N. Romanov, A. Kashtanov, S. Y. Afanasiev, B. I. Berezhko, S. V. Bushuev, S. A. Shakhkyan, Zh. E. Apinov, E. A. Zernov","doi":"10.22349/1994-6716-2022-110-2-15-27","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-15-27","url":null,"abstract":"Experimental data on crack formation of forgings made of austenitic steel grade 08Kh18N10T are presented. It has been established that the process of crack formation is determined by the process of homogenizing annealing, which is carried out during heating of ingots and forgings before the first and second removals. The development of a technology for forging large ingots made of austenitic steel grade 08Kh18N10T, taking into account these results, leads to an increase in the quality of forging and makes it possible to achieve forging without cracking.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85050976","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":"Cohesive strength of catalytic composite coatings of the Ni–Al–Al2O3 system on a metal substrate","authors":"N. Yakovleva, A. Makarov","doi":"10.22349/1994-6716-2022-110-2-71-80","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-110-2-71-80","url":null,"abstract":"Porous composite coatings based on the Ni–Al–Al2O3 system on a metal substrate were obtained by the method of cold gas-dynamic spraying and subsequent annealing. The maximum content of aluminum hydroxide Al(OH)3 is 70% in the initial powder mixture, at which a high-quality coating is formed. The dependences of the influence of the composition of metal and ceramic components on the cohesion of coatings under ultrasonic treatment are obtained.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83798774","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":"Analysis of technological processes of production of spherical powders and granules of NiAl nickel monoaluminide for the needs of domestic engine building","authors":"M. Zharov","doi":"10.22349/1994-6716-2022-111-3-29-40","DOIUrl":"https://doi.org/10.22349/1994-6716-2022-111-3-29-40","url":null,"abstract":"The article is devoted to the study of the features of various methods for obtaining granules of nickel aluminide NiAl. The problems hindering the widespread use of nickel aluminide NiAl in modern aircraft and engine construction are analyzed. It has been revealed that the main problems hindering the widespread industrial use of nickel aluminide NiAl are practically zero plasticity of the material during pressure treatment and difficulties in machining parts made of this material. However, this problem can be solved with the use of pellet metallurgy technologies, when by sintering the granular material, an almost finished product is obtained that requires minimal amounts of subsequent machining. Within the framework of the conducted studies, the quality criteria of the obtained granules were determined, which include the sphericity of the granules, the stability of the obtained dimensions of the granular material, the absence of defects in the form of pores, the absence of satellites on the surface of the granules, the presence of a finely dispersed dendritic structure of the granule material. Several methods of obtaining granules of nickel aluminide NiAl have been investigated from the point of view of obtaining the highest quality raw materials, namely: the method of spraying the melted billet with a high-temperature inert gas flow (gas atomization method), the method of centrifugal spraying of the melted electrode (PREP method), the method of centrifugation of the melt using a perforated crucible. It is determined that the optimal way to obtain a high-quality granulate of NiAl material is the method of centrifugal spraying of the melted electrode. In the course of the conducted research, it was proved that the main parameter of the process of centrifugal spraying of the melted electrode, affecting the quality of the obtained granules, their diameter and the value of the dendritic parameter of the microstructure of the granules, is not so much the current strength I as the rotation speed of the melted electrode n. The optimal values of the electrode rotation speeds are determined, which are n ≈ 15000-16000 revolutions per minute at a current strength I ≈ 1000-1500 A. A technology for obtaining high-quality NiAl material granulate has been developed and tested, which includes operations for obtaining initial NiAl blanks by self-propagating high-temperature synthesis, subsequent remelting of semi-finished products, heat treatment, separation of granules and subsequent granulation by the PREP method.","PeriodicalId":23679,"journal":{"name":"Voprosy Materialovedeniya","volume":"96 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87524945","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}