Similar Journals
|
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  [2468 journals]
|
- Correction to: Wear Resistance of Aluminum Alloy A356 After Thorough
Anodic Oxidation-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
PubDate: 2023-12-07
-
- Microstructure and Wear Resistance of Nitride Layers on Armco-Iron
Obtained By Nitriding with Zero Gas Flow-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The effect of controlled gas nitriding with zero flow at 500 and 550°C of different duration on the structure, phase composition, and wear resistance of Armco-iron is studied. Nitride layer phase composition is determined. Growth kinetics and wear resistance of a layer obtained with a nitriding potential of 1 atm – 0.5 during 10 h under dry friction conditions are studied. It is established that gas nitriding with zero flow facilitates formation of a γ′-phase surface layer, which increases Armco-iron wear resistance due to reduction in weight loss intensity.
PubDate: 2023-11-15
-
- Mathematical Modeling of the Argon Arc Welding Process. Part 1.
Thermomechanical Approach and Model Justification-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: In order to optimize the structure of the welding process and calculate the technological mode parameters, a coupled thermomechanical approach with numerical simulation in the LS-DYNA software environment is proposed. An algorithm for modeling the process of argonarc welding with a non-consumable tungsten electrode in an inert gas environment and a model for calculating temperature fields, residual stresses, and deformations are proposed. The mathematical model of the process can be represented as a virtual experimental stand for studying the welding process, as well as for determining the composition of technical means for its implementation and technological equipment for fastening the product, which ensure the manufacture of welded constructions made of various metallic materials with the required structure and properties.
PubDate: 2023-11-15
-
- Role of Metallic Alloy Interatomic Chemical Reactions with Structure
Formation during Heat Treatment-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: A new approach to explaining structure formation processes in alloys during heat treatment is suggested, which differs essentially from the traditional one. Experimental proof of the hypothesis that processes occurring in alloys during heat treatment develop due to interatomic chemical bonds (ionic and covalent) existing at condensed state temperatures is provided. This means that at each heating temperature alloy acquires a microstructure differing from that formed at other temperatures with respect to composition or size of precipitating particles. This makes quenching from the range of disordered solid solutions a superfluous operation, especially in the light of the fact that such solutions do not exist in nature. It is recommended to exclude quenching from the production process, which should limited solely to tempering.
PubDate: 2023-11-14
-
- Experimental Study of Slurry Erosion of Ni-Hard Cast Iron and Prediction
of Wear of Materials with the Use of Artificial Neural Network (ANN)-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The wear resistance of Ni-Hard alloyed cast iron under slurry erosion is studied. An attempt to predict the erosion wear of materials with the help of an artificial neural network (ANN) is made based on the experimental data on the wear of a slurry pot tester under different operating conditions. The ANN model for predicting the erosion wear of materials is proposed, which has been shown to be highly accurate. The model will allow choosing materials that satisfy the specific performance characteristics without conducting long-term tests under various operating conditions.
PubDate: 2023-11-14
-
- Mathematical Modeling of the Argon Arc Welding Process. Part 2. Welding of
HP40NbTi Alloy Pipelines-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The effect of argonarc welding modes on the structure and phase composition of a pipe welded joint made of HP40NbTi alloy is studied by computer simulation and experimental methods. The reduction of heat input due to the use of pulsed welding was shown to be an effective method for inhibiting the phase transformation of niobium carbide and preventing the formation of an undesirable G-phase in the structure of the welded joint. The possibility of purposeful regulation of the structure and, as a consequence, properties of the welded joint by optimizing the parameters of the technological process using numerical simulation in the LS-DYNA software environment is demonstrated.
PubDate: 2023-11-13
-
- Mechanical Properties of Composite Materials Based on Fe – 18% Cr –
10% Ni Alloy Obtained Using Laser Heat Treatment-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Mechanical characteristics of composite materials based on Fe – 18% Cr – 10% Ni alloy and composed of plastic macroscopic austenite regions distributed in a high-strength martensite matrix are studied. Stress-strain curves are obtained for the specimens with austenite regions differing in size and in shape. The plotted curves are used to determine the shapes of the austenite regions optimal in terms of combining the strength and ductility parameters of the material.
PubDate: 2023-11-11
-
- Flow Stress Behavior and Governing Equation of Plastic Flow of Low-Carbon
Steel at Elevated Temperatures-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The effect of hot isothermal compression on the flow stress of low-carbon steel was studied using a Gleeble 3500 stimulator at temperatures from 900 to 1200°C and deformation rates from 0.01 to 10 sec– 1. The flow stress was analyzed at elevated temperatures using a hyperbolic sine function. The material constants were determined in the range of true deformation rates from 0.1 to 0.7. The dislocation structure of low-carbon steel was studied after the deformation at 1100°C and cooling at a rate of 5 K/sec. A governing equation for describing and simulating the low-carbon steel behavior under high-temperature deformation was derived and justified. It was shown that the obtained equation can be used to provide a reliable and valid description of the low-carbon steel behavior under hot forming with a mean relative error of 5.1219% and a correlation coefficient of 0.9886. The equation can be used to model and optimize the process parameters of hot deformation of steel and to predict the evolution of its microstructure.
PubDate: 2023-11-10
-
- Effect of Heat Treatment on Two-Phase Ti – 22Al – 25Nb Alloy Phase
Composition and Microhardness-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The effect of heat treatment on evolution of the phase composition and microhardness of orthorhombic alloy Ti – 22Al – 25Nb based upon a Ti2AlNb phase (O-phase) is studied. X-ray diffraction, scanning electron microscopy, and electron back-scatter diffraction are used to study alloy phase composition after different treatments. It is shown that the alloy structure contains β/B2- and O-phases, the proportion of which changes on heat treatment. Microstructure and Vickers microhardness of alloy Ti – 22Al – 25Nb are shown to be interrelated in different states.
PubDate: 2023-11-09
-
- Distribution of Alloying Elements in Multi-Pass Welded Joints of
Chromium-Nickel Steel-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The article studies the change in the content of alloying elements in multi-pass welded joints formed by manual arc welding with TsL-11, TsT-15, and OZL-8 coated electrodes at different currents during welding of tubes made of 12Kh18N10T austenitic steel with a thickness of 6 mm. Based on the results of layer-by-layer chemical analysis of the welded joint metal and base metal, the most efficient welding modes and the sequence of bead surfacing are proposed. Practical recommendations for soft and rigid manual arc welding modes with different TsL-11 electrodes in order to form one- and two-pass welded joints with a uniform distribution of alloying elements are given.
PubDate: 2023-11-09
-
- Effect of Finish Rolling Temperature on the Texture and Fracture
Resistance of Low-Carbon High-Strength Pipe Steels during Thermomechanical
Treatment-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Sheets from a pipe steel rolled in the finishing stage of controlled thermomechanical treatment (TMT) above and below the onset temperature of γ → α transformations are studied. The structure and texture of specimens are determined by metallographic analysis; impact bending and tension tests are performed. The structural heterogeneity formed during rolling below A3 was shown to have a significant effect on the steel structure after controlled cooling. The structure acquires regions of a homogeneous crystallographic texture elongated in the rolling direction, which form preferential sites with the lowest fracture energy for secondary crack propagation. Such processes decrease the total running fracture energy in gas pipelines made of high-strength steels.
PubDate: 2023-11-08
-
- Wear Resistance of Aluminum Alloy A356 After Thorough Anodic Oxidation
-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The efficiency of thorough anodic oxidation of ASTM A356 aluminum alloy as an alternative to painting its surface is studied. Microstructure, phase composition, and microhardness of oxidized layers of various thicknesses (45, 65, 80 and 90 μm) are determined. Solid particle erosion tests are conducted in accordance with ASTM G76 and MIL STD 3033. It is established that with an increase in oxidized layer thickness aluminum alloy wear resistance is reduced and the surface roughness is reduced.
PubDate: 2023-11-08
-
- Increasing the Conductivity of Sintered Powder Al – Cu Material Due to
Electroplating of Aluminium Particles with Copper-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: An economical Al – Cu powder with high conductivity has been synthesized by a chemical substitution reaction. The powder particles have the form of an aluminium core, on which a copper shell is deposited. The deposition reaction occurs in a copper sulphate solution at a temperature of 45°C. At higher temperatures, copper diffusion proceeds faster, but the aluminium core may crack. The process of aluminium substitution with copper on the particle surface develops at different values of the standard potential of each metal. The minimum resistivity of 1.01 × 10 – 7 Ω ∙ m is obtained in a composite sintered at 550°C from the Al-core Cu-shell powder with addition of 3 wt.% glass frit. This material can find wide application, for example, as a substitute for silver in electronic devices to reduce production costs.
PubDate: 2023-11-08
-
- Arrangement of Atoms of Interstitial Impurity in the Crystal Lattice of
Iron Austenite and Mechanism of their Diffusion Jump-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: A model of the arrangement of atoms of interstitial impurity in iron austenite is developed, according to which an introduction of an interstitial impurity atom causes transformation of a regular close packing (CP or FCC) composed of octahedrons and tetrahedrons into a cementite-type local prismatic packing by diagonal flipping. Carbon dissolves in the crystalline structure of iron austenite as a centered five-atom tetrahedral cluster, which represents a fragment of the carbon packing in the crystalline structure of diamond. The diffusion of the impurity atom is accompanied by a transformation into a prism in the neighboring lattice period, while the prismatic packing in the initial location of the impurity atom is reconstructed back into a conventional interstitial void. To check the adequacy of the proposed model, theoretical calculations of the activation enthalpy of carbon and nitrogen diffusion in austenite were performed, according to which the activation enthalpy values are 149 ± 20 and 155 ± 20 kJ/mol, respectively, which is fairly consistent with the experimental data reported in the literature (153 and 169 kJ/mol).
PubDate: 2023-11-07
-
- Effect of Pulsed Current Duty Factor on Deformation Behavior of Aluminum
Bronze-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The effect of pulse current ratio on deformation behavior, microstructure and nature of fracture of aluminum bronze BrAZhNMts 9-4-4-1 under tension is studied. Tensile tests are performed and the structure of the bronze is determined. It is shown that pulse current ratio noticeably influences the behavior of the stress-strain curves and bronze mechanical properties. With a minimum pulse ratio within bronze microcrack formation is possible causing accelerated failure.
PubDate: 2023-11-07
-
- Synthesis of 25Kh15K Permanent Magnets and Study of Their Properties in
Service in Magnetic and Thermal Fields-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: The possibility of applying additive technology of selective laser melting for preparing specimens from hard magnetic alloy 25Kh15KA is considered. Melt spraying is used to prepare initial powders for melting with a good yield and adaptability to additive manufacturing. Experimental cylindrical samples with a size of ∅10 × 12 mm and ring magnets with an outer diameter of 46 mm, an inner diameter of 37.8 mm, and a height of 6 mm, are prepared. Microstructures of the specimens are studied and magnetic parameters are measured. Conformity of the properties of magnets produced by additive technology and cast magnets is demonstrated. A novel method of structure multifractal analysis is used to show that synthesized magnets are resistant to external effects.
PubDate: 2023-11-07
-
- Formation of Composite Material by Magnetic Pulse Welding of Crystalline
Titanium and Nickel-Based Amorphous Alloy-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Three-layer composite materials composed of VT1-0 alloy plates and an amorphous layer of ST15 alloy between them, which were produced by magnetic pulse welding, have been studied. The structure of the composites was studied by scanning and transmission electron microscopy. The phase composition was determined using x-ray synchrotron radiation and electron diffraction. It is shown that the welding process causes partial remelting of the amorphous ribbon and its mixing with titanium, and the cooling causes re-amorphization. Titanium interacts with atmospheric gases and forms oxides and nitrides, which are distributed in the remelted zones of the amorphous layer in the form of particles not larger than 35 nm in size. Welding of the amorphous ribbon to the less active nickel does not produce additional phases.
PubDate: 2023-11-06
-
- Special Features of Structural and Phase Transformations in Bainitic Steel
-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Special features of structural and phase transformations during the formation of bainitic steel structure were studied. The possibilities of identifying plate (PM) and lath (LM) martensite after quenching, and of tempered martensite (TM) along with upper (UB) and lower (LB) bainite after tempering of quenched steel are described. The morphology and specifics of the formation of UB, LB, and TM in the steel structure were studied. The x-ray phase analysis method was used to show the possibility of identifying phases (PM, LM, residual austenite (Ares), TM, UP and LB) and calculating their mass fractions in steel by decomposing the reflections into components. Quenching at 950°C was shown to produce PM and LM in steel with different morphologies and dislocation densities, contents of twins and carbon concentrations in the matrix. Tempering of the quenched steel at 500°C was shown to cause the following phase transition: PM + LM + Ares → UB + LB + TM + PM+ LM+ cementite. The resistance of bainitic steel to sulfide corrosion cracking underloading and to hydrogen embrittlement was assessed.
PubDate: 2023-11-06
-
- Metal Science and Heat Treatment Volume 65, Number 5
-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
PubDate: 2023-09-01
-
- Metal Science and Heat Treatment Volume 65, Number 6
-
Free pre-print version: Loading...Rate this result: What is this?Please help us test our new pre-print finding feature by giving the pre-print link a rating.
A 5 star rating indicates the linked pre-print has the exact same content as the published article.
PubDate: 2023-09-01
-
