scholarly journals Calculation of metal resistance against plastic deformation accounting its softening during continuous rolling

2020 ◽  
Vol 76 (3) ◽  
pp. 258-262
Author(s):  
A. S. O. Al’-Kkhuzai ◽  
V. V. Shirokov ◽  
A. V. Vydrin
Keyword(s):  
Plastic Deformation ◽  
Rolling Process ◽  
Metal Resistance ◽  
Continuous Mill ◽  
Deformation State ◽  
Metal Products ◽  
Stress And Deformation ◽  
Multiple Deformation ◽  
Deformation Modes ◽  
Resistance Value

The value of metal resistance against plastic deformation is an important parameter at designing of technological equipment and plastic deformation modes, since it determines considerably energy and power parameters during rolling process. Usually it is represented as dependence on deformation rate, value of accumulated deformation and temperature at which the deformation takes place. Application of such dependences usually gives a satisfactory coincidence with experimental data. However, the perfection of the rolling processes results in increase requirements to the calculation accuracy of the deformation parameters, including the value of metal resistance against plastic deformation. At the production of metal products and pipes, the processes in which a metal is subjected to multiple deformation, are widely used. One of the ways to increase the calculation accuracy of the value of metal resistance against deformation is the accounting of metal softening between their stages. Calculation of variation of the metal resistance value presented, accounting and without accounting the softening during pipes rolling at a mandrel in a four-stand continuous mill. It was shown that the softening could have a significant influence on the value of metal resistance against plastic deformation. Accounting the softening and various processes taking place along both the roller pass perimeter and the mill length, gives an actual picture of stress and deformation state of metal.

scholarly journals STUDY OF THE DEFORMED STATE CONNECTION OF THE PISTON WITH THE ROD OF THE UNREGULATED PISTON PUMP

2020 ◽  
pp. 95-103
Author(s):  
Vasyl Muzychuk
Keyword(s):  
Plastic Deformation ◽  
Shape Change ◽  
Rolling Process ◽  
Piston Pump ◽  
Connecting Rod ◽  
Maximum Value ◽  
Deformed State ◽  
Metal Products ◽  
Mechanical Bonds ◽  
Favorable Conditions

The technological processes of cold rolling of precision workpieces and ring parts, rolling of pipes, rolling of piston-connecting rod axial-rotor piston pump, which are a kind of processing of metals by pressure and contain changes in the shape of workpieces according to performing relative to the axis of the workpiece radial rotational motion. The workpiece can remain stationary or rotate. It is shown that by means of technological process of rolling of pipes, unrolling of preparations various hollow axisymmetric metal products receive, the specified processes are combined by the mechanism of deformation, namely: at them two deformations of compression and one - tension are realized. This mechanical deformation scheme creates favorable conditions for plastic deformation, because intercrystalline displacements are difficult, leading to the violation of mechanical bonds, and plastic deformation occurs mainly due to intracrystalline displacements. It is shown that in the process of connecting the piston-connecting rod in compliance with the process parameters (output supply pressure, feed rate, leaving time) the value of the specified gap either exceeds the maximum value or decreases to the value at which the next operation of the piston-connecting rod spell. The deformed state in the technological operation of rolling the piston-connecting rod pair at different stages of shape change is studied, the process control mechanism is revealed, which prevents the defect in the form of deviation from the regulated gap after rolling between the piston and the connecting rod. The used resource of plasticity at different stages of rolling is calculated, the deformability of the piston workpiece in the rolling process is estimated.

THEORETICAL AND PRACTICAL BASIS OF ROLLED PRODUCTS

2021 ◽  
Vol 2 (1) ◽  
pp. 55-60
Author(s):  
Bahodir Qurbanovich Tilabov ◽  
◽  
Saidabbos Ikromovich Isaev ◽  
Jamshid Abdurazzokovich Sherbo’taev ◽  
Ikhtiyor Chorievich Zhurakulov
Keyword(s):  
Plastic Deformation ◽  
Deformation Process ◽  
Rolled Steel ◽  
Plastic Deformation Process ◽  
Hardening Treatment ◽  
Microstructure Parameters ◽  
Metal Products ◽  
Steel Hardening ◽  
Hardening Heat Treatment

The article presents the theoretical and practical basis for the production of rolled products in the conditions of a metallurgical plant. The processes of plastic deformation of bodies between rotating drive rolls are shown. The main results of research on rolled products made of rolled steel are presented. The chemical composition, mechanical properties, macro -and microstructure parameters, and strengthening treatments of locally produced rolled steel were studied. It is shown that after hardening treatment, the strength increases and the quality of rolled products improves.Keywords:composition and properties of rolled metal products, plastic deformation process, rotating drive rollers, rolled body, rolled steel, hardening heat treatment, hardness, macro-and microstructure, performance and quality of finished products

scholarly journals Accumulative Roll Bonding of Pure Copper and IF Steel

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Saeed Tamimi ◽  
Mostafa Ketabchi ◽  
Nader Parvin ◽  
Mehdi Sanjari ◽  
Augusto Lopes
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Accumulative Roll Bonding ◽  
Pure Copper ◽  
Rolling Process ◽  
Ultrafine Grain ◽  
Crystallographic Structure ◽  
Interstitial Free ◽  
If Steel ◽  
Roll Bonding

Severe plastic deformation is a new method to produce ultrafine grain materials with enhanced mechanical properties. The main objective of this work is to investigate whether accumulative roll bonding (ARB) is an effective grain refinement technique for two engineering materials of pure copper and interstitial free (IF) steel strips. Additionally, the influence of severely plastic deformation imposed by ARB on the mechanical properties of these materials with different crystallographic structure is taken into account. For this purpose, a number of ARB processes were performed at elevated temperature on the materials with 50% of plastic deformation in each rolling pass. Hardness of the samples was measured using microhardness tests. It was found that both the ultimate grain size achieved, and the degree of bonding depend on the number of rolling passes and the total plastic deformation. The rolling process was stopped in the 4th cycle for copper and the 10th cycle for IF steel, until cracking of the edges became pronounced. The effects of process temperature and wire-brushing as significant parameters in ARB process on the mechanical behaviour of the samples were evaluated.

scholarly journals Influence of Plastic Deformation on Microstructural Evolution of 100Cr6 Bearing Ring in Hot Ring Rolling

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4355
Author(s):  
Guanghua Zhou ◽  
Wenting Wei ◽  
Qinglong Liu
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Microstructural Evolution ◽  
Vickers Hardness ◽  
Microstructural Characterization ◽  
Lamellar Spacing ◽  
Rolling Process ◽  
Rolling Reduction ◽  
Ring Rolling ◽  
Bearing Rings

The hot ring rolling technology as the crucial procedure for the manufacture of bearing rings plays an important role in determining the final microstructure of bearing rings. In this work, the influence of the hot ring rolling process on the microstructural evolution of 100Cr6 bearing rings was investigated using a three-dimensional (3D) numerical model and microstructural characterization. It was found that the significant microstructural refinement occurs at the different regions of the rings. However, owing to the non-uniform plastic deformation of hot rolling, the refinement rate of grain size and decrease of pearlite lamellar spacing (PLS) also showed uniformity at different regions of the rings. Furthermore, the degree of grain refinement had been limited with the increase of rolling reduction. Due to the refined grain size and decreased PLS, the Vickers hardness increased with the increase of rolling reduction. Moreover, the Vickers hardness from the outer surface to the inner surface of the ring is asymmetrical u-shaped, which had the law of lower hardness in the center area and higher hardness on the surface.

Plastic deformation modes in paramagnetic γ-Fe from longitudinal spin fluctuation theory

2018 ◽  
Vol 109 ◽  
pp. 43-53 ◽  
Author(s):  
Zhihua Dong ◽  
Stephan Schönecker ◽  
Wei Li ◽  
Se Kyun Kwon ◽  
Levente Vitos
Keyword(s):  
Plastic Deformation ◽  
Spin Fluctuation ◽  
Fluctuation Theory ◽  
Longitudinal Spin ◽  
Deformation Modes

The Numerical Simulation of the Lateral Inhomogeneous Deformation of the Permafrost Subgrade

2014 ◽  
Vol 945-949 ◽  
pp. 198-202
Author(s):  
Yu Shuo Fan ◽  
Xue Song Mao ◽  
Qing Meng Meng ◽  
Bin Bin Luo
Keyword(s):  
Numerical Simulation ◽  
Plastic Deformation ◽  
Deformation Field ◽  
Inhomogeneous Deformation ◽  
Key Factors ◽  
Melting Depth ◽  
Finite Element Software ◽  
Factors Influencing ◽  
Stress And Deformation ◽  
Control Equation

The Qinghai-Tibet highway subgrade inhomogeneous deformation is very serious because of the bad climate environment and the special engineering condition of permafrost. To reveal the mechanism of subgrade diseases, based on the theory of elastic-plastic deformation, the control equation of the stress and deformation field of the subgrade is established. We analyze subgrade stress and deformation field by finite element software. Considering effect of the southern and northern slopes, the model of the inhomogeneous deformation of the subgrade was established. Then we calculated the variation characteristic of the lateral inhomogeneous deformation under different melting depth. The results showed that the melting interlayer, melting depth and the effect of southern and northern slopes were the key factors influencing the permafrost subgrade lateral inhomogeneous deformation.

Ti-Nb-Ta-Zr Alloy Rolling Deformation Texture

2012 ◽  
Vol 532-533 ◽  
pp. 87-91
Author(s):  
Li Yan ◽  
Yu Liang Liu ◽  
Lin Guang Zhang ◽  
Hui Wu Yu
Keyword(s):  
High Strength ◽  
Rolling Process ◽  
Deformation Texture ◽  
High Density ◽  
Texture Axis ◽  
Low Elastic Modulus ◽  
Deformation State ◽  
Dislocation Cells ◽  
Rolling Deformation ◽  
Zr Alloy

TiNbTaZr alloy is potential medical biomaterials, due to its high strength, low elastic modulus, superelasticity, superplasticity, and many other excellent performances. TiNbTaZr rolling samples under solid solution state and deformation state were characterized by TEM and XRD technologies. The results show that the alloy has the grain size of 42mm, straight of grain boundaries, intragranular no significant defects after solution heat treatment at 1063K. When the deformation reaches 40% in the rolling process, the local zones in intragranular appears high density of dislocations and a small amount of twinning. When the rolling is to 92%, the high density of dislocation cells forms nano subgrain block in sample with {100} plate texture and the texture axis of {100} plate under density of 2.29.

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