Physical Mesomechanics最新文献

Retained Austenite Transformation and Portevin–Le Chatelier Effect in 44CrMn2Si2Mo Steel under Tension

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060043

S. I. Borisov, Yu. I. Borisova, E. S. Tkachev, S. M. Gaidar, R. O. Kaibyshev

{"title":"Retained Austenite Transformation and Portevin–Le Chatelier Effect in 44CrMn2Si2Mo Steel under Tension","authors":"S. I. Borisov, Yu. I. Borisova, E. S. Tkachev, S. M. Gaidar, R. O. Kaibyshev","doi":"10.1134/S1029959924060043","DOIUrl":"10.1134/S1029959924060043","url":null,"abstract":"The 44CrMn2Si2Mo steel heat treated by quenching and partitioning demonstrates a unique combination of strength characteristics: the yield stress σ0.2 = 1140 MPa, ultimate strength σВ = 1690 MPa, and elongation δ = 20.7%. Quenching and partitioning leads to the formation of a multiphase structure consisting of primary martensite, retained austenite, bainite, and secondary martensite. Primary martensite and bainite contain transition-metal carbides Fe2C. The high ductility of the steel is due to the transformation of retained austenite into strain-induced martensite during tension, which ensures high strain hardening. Stable plastic flow is observed at low strain, when a significant fraction of retained austenite is transformed into strain-induced martensite. The plastic flow instability, which appears as the Portevin–Le Chatelier effect on deformation curves and plastic flow localization in deformation bands, occurs at higher strains and is associated with the transformation of film-like retained austenite. The velocity of deformation bands decreases with a decrease in the volume fraction of retained austenite. Localization of plastic flow in the neck and fracture occur when the transformation of retained austenite into strain-induced martensite cannot provide strain hardening, and deformation bands lose their mobility.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"664 - 677"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790347","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

Mechanical Properties and Fracture of Ultrafine-Grained Near β Titanium Alloy under Three-Point Bending

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060109

E. V. Naydenkin, I. P. Mishin, I. V. Ratochka, B. B. Straumal, O. V. Zabudchenko, O. N. Lykova, A. I. Manisheva

引用次数: 0

Radial Dependences of the Phase Composition, Nanohardness, and Young’s Modulus for Ti–2 wt % Fe Alloy after High-Pressure Torsion

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060018

A. S. Gornakova, S. I. Prokofjev, N. S. Afonikova, A. I. Tyurin, A. R. Kilmametov, A. V. Korneva, B. B. Straumal

{"title":"Radial Dependences of the Phase Composition, Nanohardness, and Young’s Modulus for Ti–2 wt % Fe Alloy after High-Pressure Torsion","authors":"A. S. Gornakova, S. I. Prokofjev, N. S. Afonikova, A. I. Tyurin, A. R. Kilmametov, A. V. Korneva, B. B. Straumal","doi":"10.1134/S1029959924060018","DOIUrl":"10.1134/S1029959924060018","url":null,"abstract":"The specimens of Ti–2 wt % Fe alloy were annealed at three different temperatures, in the β-Ti, α-Ti + β-Ti and α-Ti + TiFe fields of the Ti–Fe phase diagram, then water quenched and subjected to high-pressure torsion (HPT). The X-ray diffraction analysis showed that the main phase in all annealed specimens was the α phase (more than 90%), while the main phase after HPT was the ω phase. Hardness H and Young’s modulus E were determined by nanoindentation at the center, in the middle of the radius, and near the edge of each specimen. It was found that the H and E values were different for specimens annealed at different temperatures and depended on the radial coordinate of the indentation region. The maximum H values were obtained in the middle of the radius of the specimens. The E values of all specimens decreased from the center to the edge, reaching very low values. The paper discusses structure transformations during HPT, the behavior of the radial dependences of H and E, and probable causes of a strong decrease in E values.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"627 - 641"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790337","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

Effect of Preliminary Deformation on the Formation of Ultrafine-Grained Structure during Equal Channel Angular Pressing of Magnesium Alloys

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060055

A. V. Botkin, R. Z. Valiev, E. P. Volkova, G. D. Khudododova, R. Ebrahimi

引用次数: 0

Role of Nanosized Rotational Vortices in Cold Deformation of Metallic Glasses by the Example of Alloy Vit105

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060031

Vas. V. Astanin, E. A. Korznikova, D. V. Gunderov, V. V. Astanin, S. V. Dmitriev, J. Bhatt

{"title":"Role of Nanosized Rotational Vortices in Cold Deformation of Metallic Glasses by the Example of Alloy Vit105","authors":"Vas. V. Astanin, E. A. Korznikova, D. V. Gunderov, V. V. Astanin, S. V. Dmitriev, J. Bhatt","doi":"10.1134/S1029959924060031","DOIUrl":"10.1134/S1029959924060031","url":null,"abstract":"The experimental data on the deformation of amorphous alloy Vit105 (Zr52.5Cu17.9Al10Ni14.6Ti5) and its molecular dynamics simulation gave birth to new ideas about the mechanism of plastic deformation of disordered structures. A special method of torsion under hydrostatic pressure allows forming a developed deformation relief on the surface of polished specimens. Inspection of the relief points to the formation of shear bands on the surface, which can merge or branch, freely intersect or be arrested by an obstacle, forming a delta of small shear bands. Simulations based on the Morse pair potential made it possible to build a two-dimensional amorphous model and study its deformation at the atomic level. Under loading, material parts are displaced due to the appearance of atomic-scale vortices in the shear band layer by means of free volume, which is a structural feature of amorphous materials. A vortex causes redistribution of stress fields, which, when added to external stresses, are capable of activating similar vortices in the neighboring zones of the material, both in the direction of the applied stresses and along the vortex axis. In the latter case, a vortex tube is formed, which acts by the tornado mechanism. Shear is induced by the tube motion in the direction of principle shear stresses, and traces on the specimen surface are made by its screw component. An increase in the number of vortex tubes and their interaction causes a deformation band. Though playing the role of dislocations, vortex tubes are independent of specific crystalline planes and can move in arbitrary directions. This explains the experimentally observed features of deformation of amorphous alloys.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"653 - 663"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790392","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

Mathematical Modeling of Complex-Shape Forming of Ultrafine-Grained Ti Alloy and Subsequent Deposition of Protective High-Entropy Coatings

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060092

R. R. Valiev, A. V. Oleinik, R. N. Asfandiyarov, A. Yu. Nazarov, K. N. Ramazanov, Ya. N. Savina, A. R. Kilmametov

{"title":"Mathematical Modeling of Complex-Shape Forming of Ultrafine-Grained Ti Alloy and Subsequent Deposition of Protective High-Entropy Coatings","authors":"R. R. Valiev, A. V. Oleinik, R. N. Asfandiyarov, A. Yu. Nazarov, K. N. Ramazanov, Ya. N. Savina, A. R. Kilmametov","doi":"10.1134/S1029959924060092","DOIUrl":"10.1134/S1029959924060092","url":null,"abstract":"The paper reports on finite element simulation of extrusion of a complex-shaped billet from the ultrafine-grained Ti-6Al-4V alloy and vacuum-arc deposition of a protective coating based on the TiVZrCrAl high-entropy alloy. Temperature fields formed in the billet during extrusion are studied. Deformation heating and the necessary forming force are determined for the initial temperature-rate conditions. The strain rate distribution in the billet during extrusion is also analyzed. According to the obtained data, the chosen temperature-rate conditions allow using the ultrafine-grained titanium alloy as the initial billet without deteriorating its mechanical characteristics. Computer simulation of the coating deposition on the complex-shaped billet provides values of the temperature, chemical composition, and thickness of the high-entropy coating. Thus, the coating thickness varies within 6.5–7.5 μm, and the surface is heated during deposition to 368–597°C, which allows maintaining the ultrafine-grained structure in the alloy.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"725 - 735"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790295","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

Effect of Vanadium-Alloying on Microstructural Evolution and Strengthening Mechanisms of High-Nitrogen Steel Processed by High-Pressure Torsion

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060110

E. G. Astafurova, G. G. Maier, S. V. Astafurov

{"title":"Effect of Vanadium-Alloying on Microstructural Evolution and Strengthening Mechanisms of High-Nitrogen Steel Processed by High-Pressure Torsion","authors":"E. G. Astafurova, G. G. Maier, S. V. Astafurov","doi":"10.1134/S1029959924060110","DOIUrl":"10.1134/S1029959924060110","url":null,"abstract":"We study the effect of high-pressure torsion on the microstructure, phase composition, microhardness, and strengthening mechanisms of high-nitrogen austenitic steels with different vanadium content: Fe-23Cr-19Mn-0.2C-0.5N, Fe-19Cr-21Mn-1.3V-0.3C-0.8N, and Fe-18Cr-23Mn-2.6V-0.3C-0.8N, wt %. Regardless of the chemical composition of the steels, high-pressure torsion (HPT) causes the refinement of their microstructure due to a high density of dislocations, twin boundaries, and shear bands. Vanadium alloying decreases the stacking fault probability in the structure of the steels and changes their dominating deformation mechanism under high-pressure torsion: from planar dislocation slip and twinning in the vanadium-free steel to dislocation slip with a tendency to shear band formation in the vanadium-alloyed steels. An increase in the vanadium content forces precipitation hardening. Thus, after HPT, the V-alloyed steels have a higher microhardness as compared to the vanadium-free one. Different strengthening factors (strain hardening, solid solution hardening, and precipitation strengthening) govern the value and kinetics of growth of microhardness of the steels processed by high-pressure torsion. Vanadium alloying and increasing its content result in the growth of the contribution of precipitation hardening and decreases strain hardening of high-nitrogen steels.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"747 - 759"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1029959924060110.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Asymmetric Rolling on the Structure and Properties of Cu-Cr-Zr Alloys

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060067

D. A. Aksenov, G. I. Raab, A. G. Raab, A. M. Pesin, H. Yu

{"title":"Effect of Asymmetric Rolling on the Structure and Properties of Cu-Cr-Zr Alloys","authors":"D. A. Aksenov, G. I. Raab, A. G. Raab, A. M. Pesin, H. Yu","doi":"10.1134/S1029959924060067","DOIUrl":"10.1134/S1029959924060067","url":null,"abstract":"Asymmetric rolling is a high-tech method based on the principles of severe plastic deformation. In the present paper, it is shown that Cu-0.8Cr-0.1Zr alloy is highly strengthened during asymmetric rolling due to structure refinement to an ultrafine-grained state. For example, in only one pass, at the accumulated strain 0.94 ± 0.20, the strength increases from 265 to 425 MPa. During the deformation process, the structure becomes refined, with the average size of fragments reaching 235 ± 90 nm. Structure heterogeneity is also observed in the cross section of a sample, which is associated with different rotation speeds of the rolls. The shape of grains in the central zone of samples corresponds to the state after conventional symmetric rolling. However, in the zone adjacent to the roll rotating at a higher speed, mechanical texture of grains is similar to that after shear. Subsequent aging of Cu-0.8Cr-0.1Zr alloy at 450°C makes it possible to achieve the ultimate strength 560 MPa and electrical conductivity 82% IACS, which exceeds the characteristics of the strengthened steel by 10–15%. The analysis of contributions to strengthening during asymmetric rolling reveals that the main contribution comes from the refinement of the grain structure to an ultrafine-grained state, which amounts to 58%. The fractions of the dislocation and dispersion contributions comprise 15 and 20%, respectively. Compared to conventional rolling, as well as other deformation methods that provide the same level of accumulated strain and strengthening in one cycle, such as equal channel angular pressing-conform, asymmetric rolling is the most promising due to its simpler process scheme.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"687 - 697"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790393","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

Performance of Twinning-Induced Plasticity Steel Processed by Multipass Equal Channel Angular Pressing at High Temperatures

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060079

N. A. Enikeev, M. M. Abramova, I. V. Smirnov, A. M. Mavlyutov, J. G. Kim, C. S. Lee, H. S. Kim

引用次数: 0

Functional and Mechanical Characteristics of Ultrafine-Grained Fe-Mn-Si Alloys for Biomedical Applications

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060080

O. V. Rybalchenko, N. S. Martynenko, G. V. Rybalchenko, E. A. Lukyanova, V. S. Komarov, M. A. Kaplan, A. N. Belyakov, P. D. Dolzhenko, I. V. Shchetinin, A. G. Raab, S. V. Dobatkin, S. D. Prokoshkin

引用次数: 0