Stress In Deformation Zone Research Articles

Stress-strain state of metal in deformation zone during production of steel section billets on the unit of combined continuous casting and deformation. Report 1

Volumetric problem of determining stress-strain state of metal in deformation zone during forming of three section billets from the slab by separating collars of grooved strikers on the unit of combined continuous casting and deformation was set and solved. The expediency of using such unit was justified for longitudinal division mation are given for St3sp steel. The solid-state finite elements used in calculation of stress-strain state of metal in deformation zone and dimensions of the grid are described. The results of calculation of stress-strain state of metal in deformation zone were obtained by solving the problem of elasticity by the finite element method in volumetric formulation. The results of calculation of displacements and stresses in deformation zone are given in form of graphs and tables by working surfaces in four cross sections and are presented for characteristic points. Values and regularities of distribution of axial displacements in width and length of deformation center were determined during introduction of strikers separating collars into continuously cast slab in production of three section steel billets on the unit of combined continuous casting and deformation.

Sustainable development of the steel plate hot rolling technology due to energy-power process parameters justification

In order to ensure sustainable development of rolling production, technological processes were investigated using computer simulation, which allows us to examine a large amount of information regarding modes of reduction and energy consumption of metal treatment under pressure in order to determine rational values. Simulation of hot rolling process using DEFORM-3D software was performed to investigate energy parameters of treatment and to determine rational reduction modes. During investigation, objects were located in space, exact positioning of casting rollers respectively to workpiece was performed, and rheological model of deformable material was specified, where rigid-plastic environment was adopted. Mechanical properties of workpiece material were determined, low carbon steel was selected as material, reduction between casting rollers was specified, and friction coefficient between workpiece and rollers, which is equal to 0.3; contact interaction between casting rollers and workpiece was specified, hot rolling temperature was set to 1000°C. Finite element model of treated material was developed, displacement in deformation zone during hot rolling and vector field of metal movement were determined. Changes in force during treatment, deformation stress during rolling were determined. Changes of rolling force in deformation zone in course of time were determined. Distribution of active stress in deformation zone was investigated. Investigations allowed us to determine energy consumption of rolling process depending on reduction modes, which provided rational treatment modes.

Distribution of Stress in Deformation Zone of Niobium Microalloyed Steel

Microalloyed steels today represent a significant part of total world production and processing of steel. Although widely used, there are scarce data on the stress distribution in the deformation zone of these steels. Research was carried out on two steel grades, both low-carbon structural steels with the same basic chemical composition, with one of them additionally microalloyed with niobium. Differences in the stress distribution in the deformation zone between two tested steels were continuously observed and measured using the methods of digital image correlation and thermography. It has been found out that niobium microalloyed steel has significantly more complex material flow and stress distribution in the deformation zone when compared to the plain low carbon steel.

Physical Simulation on Forging Method with Horizontal V-Shaped Anvil

The forging method with horizontal V – shaped anvil is introduced to control fibrous tissue flow direction through changing shape of anvil, its working face is composed of four projecting cone, it can realize no transverse tensile stress forging. For this, in the paper qualitative physical simulation was carried out. The results show that there was no crack between the hole and the pin in deformation zone of rectangular billet by horizontal V – shaped anvil forging method, therefore, the authors think that there no transverse tensile stress in deformation zone of billet in the forging process of horizontal V – shaped anvil.

Effect of reduction ratio, inclusion size and distance between inclusions on wire breaks in Cu fine wiredrawing

The presence of an inclusion in wire makes wire breaks easy to occur even with a high reduction ratio. The investigation presented here is mainly aimed at determining the reduction ratio when size of an inclusion, application of back tension and distance between inclusions are considered. In order to investigate the effect of back tension on wire breaks, the applied back tension in a slip type continuous drawing machine is calculated quantitatively using some parameters such as diameter and peripheral speed of capstan and coiling number. The effect of an inclusion size and reduction ratio on wire breaks is investigated when quantitatively calculated back tension being 28% of drawing force is applied. The size of an inclusion varies 5, 7 and 10 μm, the reduction ratio varies 10, 13 and 16%, the distance between inclusions is set to be 0.25 and 0.5 mm, respectively. Conical dies with a half angle α of 7°, which is the value generally used in commercial production. As the FEM code, the commercially available software DEFORM-2D is used. Copper is used for fine wire drawing process that initial diameter is 1 mm and final diameter is up to 50 μm. Accumulated strain and mean stress are simultaneously calculated to obtain damage value in the multistage wiredrawing. The defects of central burst type are generated at a smaller total reduction ratio with decreasing unit reduction ratio and with increasing inclusion size. Furthermore, damage value rises because the tensile stress in deformation zone increases by applied back tension. The distance between inclusions would not affect wire breaks because the distance is expanded excessively through multistage wiredrawing.