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Metal Science and Heat Treatment
Journal Prestige (SJR): 0.279  Number of Followers: 36  Hybrid journal (It can contain Open Access articles)ISSN (Print) 1573-8973 - ISSN (Online) 0026-0673 Published by Springer-Verlag  [2467 journals]
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- Microstructure and Mechanical Properties of Aircraft Steel 30Kh2GSN2VM
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Abstract: Special features of structure formation in steel 30Kh2GSN2BM under continuous cooling from the temperature of complete austenitization and under an isothermal hold in the temperature range of bainitic transformation are studied. Metallographic and x-ray diffraction phase analysis are performed and tensile and impact bending tests of specimens are conducted. The data of the dilatometric and metallographic studies are used to plot a thermokinetic diagram of transformation of supercooled austenite. The laws of variation of mechanical properties of the steel after oil quenching and tempering and after normalizing in air and different variants of isothermal quenching are determined.
PubDate: 2022-11-24
DOI: 10.1007/s11041-022-00832-8
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- Crystallographic Features of Phase Transformations in Titanium Alloy VT6
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Abstract: Special feature of formation of local texture of α- and β-phases in polymorphic transformation in titanium alloy VT6 are studied by orientation microscopy (EBSD). The specimens are treated by an isothermal hold in the single-phase β-range at 1065°C and cooled in water, in air, or with the furnace. The crystallographic misorientations of crystallites in the α-phase and between the α- and β-phases are studied. It is shown that a dominant shear component is typical for polymorphic transformations occurring at any cooling rate. A secondary β-phase precipitated during the cooling in the (α + β)-range differs in its orientation from the high-temperature β-phase.
PubDate: 2022-11-24
DOI: 10.1007/s11041-022-00816-8
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- Tensile Deformation Behavior of Rotary Friction Welded Joint of Steels
32G2 and 40KhN-
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Abstract: A welded joint from steels 32G2 and 40KhN obtained by rotary friction welding and a monolithic sample of steel 32G2 are studied. The welded joint is subjected to tensile testing with detection of the strain fields by digital image correlation. The strain distribution is analyzed at various time moments. It is shown that strain localization in the joint of unlike steels in the stage of pre-failure occurs in the thermomechanically affected zone of steel 32G2; the joint has an enough margin of strength and ductility commensurable with that of the base 32G2 metal.
PubDate: 2022-11-24
DOI: 10.1007/s11041-022-00821-x
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- Correction to: Effect of SiC on Mechanical Properties of Al-Based Metal
Matrix Composites Produced by Stir Casting-
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PubDate: 2022-11-23
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- Structure of Chernov–Luders Band in Normalized Steel 09G2S. Part II.
Deformation Zone-
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Abstract: Growth and arrangement of strain bands in the deformation zone (Chernov–Luders band) under tension of specimens of steel 09G2S that have undergone normalizing is studied using the method of correlation of digital images. The rates of longitudinal (over the loading axis) and transverse growth of the strain bands and of the deformation zone are evaluated. Transmission electron microscopy is used to study the dislocation structure inside the first strain band up to its intersection with the second band. It is shown that the arising strain bands intersect pairwise in the middle of the specimen and in the germinative centers located near the edges of the flat specimen, as a result of which they are arranged in a truss-like manner.
PubDate: 2022-11-23
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- Effect of Heat Treatment on the Structure and Mechanical Properties of
Tool Steel 1.6% C – 12% Cr – 0.8% Mo – 0.9% V-
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Abstract: The effect of heat treatment modes of tool steel Fe – 12% Cr – 0.8% Mo – 0.9% V – 1.6% C on its structure and strength is analyzed. The temperatures for quenching and tempering providing maximum hardness and strength and satisfactory ductility are determined.
PubDate: 2022-11-23
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- Comparison of the Structure and Properties of a Tube from Titanium Alloy
Ti – 3% Al – 2.5% V with Results of Digitalization of the Process of
its Pressing-
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Abstract: Computer simulation of the action of pressing deformation over a section of a tube from titanium alloy Grade 9 is performed. Acomputer model is used to determine the forces developed by the pressing tool during fabrication of the tube under a peak load and in a steady stage. The values computed are comparable to the experimental data obtained in actual production. The adequacy of the simulation is checked by comparative analysis of the evolution of the structure, texture, physical and mechanical properties in cross section of the hot-pressed tube.
PubDate: 2022-11-23
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- Crystallographic Features of Shear γ – α Transformation in Steel
10Kh18N10T Subjected to Radioactive Irradiation-
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Abstract: The structural state of steel 10Kh18N10T after long-term radioactive irradiation at about 480°C is studied. The microstructure of the steel is analyzed by the EBSD technique using a scanning microscope. The texture of the specimens is investigated by plotting direct pole figures. It is shown that a directed martensitic transformation develops in the surface layer of the steel under the action of internal stresses caused by radiation swelling. Fine particles of secondary austenite precipitate in the formed martensite and obey orientation relations not coinciding with the relations acting under the primary shear γ → α′ transformation in a part of the bcc crystallites.
PubDate: 2022-11-23
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- Design, Structure and Mechanical Properties of Aluminum Articles Obtained
with the Help of 3D Laser Printing-
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Abstract: A part of a filtering and cooling module is designed and produced by the method of selective laser melting of powder aluminum alloy AlSi10Mg. The initial powder material is certified with respect to the particle shape and granulometric composition. The mechanical properties and the microstructure of the material of the part are studied.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00835-5
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- Effect of Heat Treatment on the Structure and Properties of Composite
Bronzes Reinforced with Steel Dendrites-
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Abstract: Three composite bronzes reinforced with steel dendrites from steels of different classes, which perform the function of a bearing surface in sliding friction, are studied. The chemical compositions of the dendrites and of the matrix are determined as a function of the heat treatment of bronze BrZhNOA 12-7-2-1. The fine structure of dendrites in bronze BrZhNKoA 9-4-1-1 is studied and the effect of the aging temperature in the intermetallic reinforcement of the dendrite with composition corresponding to maraging steel N23Yu1 is determined. The type of the crystal lattice of the dendrite is shown to affect substantially the tribological properties of bronze BrZhNKhA 12-9-3-1.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00819-5
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- Simulation of Grain Growth in Aluminum Alloys under Selective Laser
Melting-
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Abstract: A computer model for simulating the processes of crystallization of multicomponent aluminum-base alloys under laser treatment is developed. Crystallization of an alloy is simulated at various parameters, i.e., sizes of the construction zone, number of acts of nucleation and growth of grains, and maximum total number of acts in the system. The model exhibits good reproducibility of results and makes it possible to determine such structural parameters as the mean grain size, the form factor, and the proportion of recrystallized volume in the crystallization process. The model may be used for designing recrystallization under the conditions of presence of an epitaxial layer (substrate), which permits estimation of the effect of crystallization parameters on formation of a zone of columnar crystals in the structure and optimization of these parameters.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00833-7
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- Formation of Intermediate Phases in Decomposition of Metastable B-Phase in
Titanium Alloys of Transition Class-
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Abstract: The process of precipitation of transition phases in quenched alloys Ti – 14% Mo and VST3553 is studied under aging at from 300 to 500°C. X-ray diffraction phase analysis and transmission electron microscopy are used to detect the presence of a metastable O″-phase in the alloys quenched from the β-range. The morphology of the precipitated particles and the kinetics of formation of the O″-phase are determined. It is shown that phases O′ and/or O″ are continuously associated with precipitation of phase ω and are transition phases up to the temperature of formation of the α-phase, i.e., 500°C.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00829-3
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- Inheritance of Structure and Texture in Alloy Zr – 2.5% Nb
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Abstract: The structure and texture of alloy Zr – 2.5% Nb in initial condition and after a heat treatment (exposure to 930°C, rapid or slow cooling) are studied by the method of electron backscatter diffraction. The main crystallographic orientations of the α- and β-phases are determined. Existence of a dominant shear component in the β → α transformation in the alloy after different treatments is detected. Structure and texture inheritance is shown to occur in alloy Zr – 2.5% Nb as a result of the α → β → α phase transformations.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00820-y
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- Effect Cooling Conditions on the Structure and Properties of Alloy VTI-4
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Abstract: The effect of continuous cooling at a rate of 1.1 K/min and combined cooling with an isothermal hold at 860 – 940°C on the structure, phase composition and properties of titanium alloy VTI-4 is studied. It is shown that introduction of an isothermal hold into the cooling mode lowers the hardness and elevates the content of untransformed β-phase in the structure of the alloy. The structure of the alloy is shown to be the most homogeneous without a feature of secondary decomposition yielding fine precipitates and with a maximum content of β-phase after an isothermal hold at 800°C for 1 h.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00830-w
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- Effect of Hydrogen Sulfide Containing Environment on the Characteristics
of Strength, Cyclic Endurance and Magnetic Properties of Cr – Mo – V
– Nb Pipe Steel-
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Abstract: The effect of exposure to a hydrogen sulfide containing environment on mechanical and magnetic properties of an advanced sparingly alloyed Cr – Mo – V – Nb steel for oilfield pipes, which should meet strict requirements on the strength and resistance to stress sulfide corrosion cracking, is studied. It is shown that a 384-h hold in a medium of H2S does not affect substantially the characteristics of strength and cyclic endurance of the steel in the range of –70 ÷ +70°C. The magnetic parameters to be used for developing methods of nondestructive inspection of parts and structure components from the steel studied are suggested.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00823-9
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- Tensile Deformation Behavior of Steel 20Kh3 After Quenching and Tempering
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Abstract: The structure and tensile mechanical properties of sparingly alloyed steel 20Kh3 are studied after quenching and tempering at different temperatures. Comparative analysis of the load-extension curves in individual deformation stages and of the fracture zones after tempering at 250 – 650°C is performed. It is shown that the low ductility margin of steel 20Kh3 after high-temperature tempering is a result of precipitation of special carbides controlling the density and mobility of dislocations both inside grains (Cr7C3) and over grain boundaries (Cr7C3, Cr23C6 ).
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00826-6
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- Crystallographic Features of Phase Transformations in Steel 100KhN3A
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Abstract: The structure of the surface layer of steel 12KhN3A after carburizing is studied. The content of carbon in the surface layer is shown to correspond to steel 100KhN3A. The crystallographic features of decomposition of supercooled austenite in the layer are investigated. Orientation microscopy is performed with the use of a scanning electron microscope. The orientation relations arising in the martensitic and pearlitic transformations are considered. It is shown that the orientation relations in the γ → α′ transformation are intermediate between the orientation relations of Kurdyumov–Sachs, Nishiyama–Wasserman and {113}γ ∥ {112}α, ⟨110⟩γ ∥ ⟨111⟩α.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00817-7
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- Effect of Tensile Elastic Deformations on Magnetic Properties of
Preliminarily Deformed Structural Steel Operating Under Pressure-
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Abstract: The effect of elastic deformations by uniaxial tension on magnetic characteristics of preliminarily deformed structural steel 20K used for making objects operating under pressure (boilers, tanks, vessels etc.) is studied. The mechanical properties and the chemical composition of the steel are determined. The magnetic properties are tested in a closed magnetic circuit and with attached magnetic devices to determine the informative magnetic parameters to be used for developing techniques for nondestructive inspection of the stress–strain state of structures from the steel studied.
PubDate: 2022-11-23
DOI: 10.1007/s11041-022-00822-w
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- Metal Science and Heat Treatment Volume 64, Number 7
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PubDate: 2022-11-01
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- Metal Science and Heat Treatment Volume 64, Number 8
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PubDate: 2022-11-01
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