Research on the Tendency of Inner Crack during 3-Roll Skew Rolling Process of Round Billets

Li, Sheng Zhi; Hu, Lan; Ding, Bo

doi:10.4028/www.scientific.net/amr.145.238

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…According to Figure 7, the lowest strength (and the lowest hardness) is located approximately half of the billet radius. It is known that at three-high screw rolling there is a danger of the ring shaped fracture [20,27], and for that ring rigidity, the coefficient value under stress condition is the highest [1,20]. The rigidity coefficient under stress condition divided by three is known as stress triaxiality, which researchers recommend using for fracture prediction during screw rolling processes [28,29].…”

Section: Resultsmentioning

confidence: 99%

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Skripalenko

Галкин

Karpov³

et al. 2019

Materials

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Radial-shear rolling (RSR) of titanium alloy billets was realized in a three-high rolling mill. Experimental rolling was simulated using DEFORM software. The purpose was to reveal how stress-strain state parameters, grain structure and hardness vary along the billet’s radius in the stationary stage of the RSR process. It was also the goal to establish a relation between stress state parameters, hardness and grain structure. Changes in the accumulated strain and the stress triaxiality were established by computer simulation. Hardness and grain size changes were obtained after experimental rolling. The novelty aspect is that both computer simulation and experimental rolling showed that there is a ring-shape area with lowered strength in the billet’s cross-section. The radius of the ring-shape area was predicted as a result of the research.

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Section: Resultsmentioning

confidence: 99%

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Skripalenko

Галкин

Karpov³

et al. 2019

Materials

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“…For instance, it is effective for the formation of the super-elastic properties of Ti-18Zr-14Nb alloys, which are used for orthopedic implants [27]. Computer simulation, including FEM-based, is applied for the estimation of the stress-strain state parameters and temperature distribution through the rolled billet's volume during RSR [28][29][30][31][32]. Some research has been dedicated to the joint use of computer simulation and experimental RSR for different purposes: the prediction of a possible billet's fracture during RSR [11], the estimation of the features of the stressstrain state parameters' distribution during the stationary and nonstationary stages of RSR [33][34][35], research of the billet's microstructure and property formation [36][37][38][39], and the estimation of the stress-strain state parameters' distribution in the deformation zone during RSR [14,20,40,41].…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Kinematic Condition of Radial Shear Rolling and Estimation of Its Influence on a Titanium Billet Microstructure

Skripalenko

Karpov²,

Рогачев

et al. 2022

Materials

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The finite element method (FEM) computer simulation of the three-high radial shear rolling of Ti-6Al-4V alloy round billets was conducted using QForm software. The simulation was performed for the MISIS-100T rolling mill’s three passes according to the following rolling route: 76 mm (the initial billet diameter) →65 mm→55 mm→48 mm (the final billet diameter). The change in the total velocity values for the points on the radius of the 48 mm diameter billet was estimated while passing the rolls’ draft. The relative increase in the accumulated strain was estimated for the same points. Then, experimental shear rolling was performed. Grain sizes of the α- and β-phases were estimated in the cross section of the final billet at the stationary stage of rolling. The grain size distribution histograms for different phases were plotted. An area was found in the billet’s cross section in which the trend of change in the total velocity of the points changed. This area represented a neutral layer between the slowing peripheral segments of the billet and the accelerating central segments of the billet. Inside this neutral layer, the limits of the cylindrical surface radius value were estimated. Experimental radial shear rolling was performed to compare the experimental rolling results (the billet microstructure investigation) with the computer simulation results. The computer simulation obtained two estimations of the radius limits: 8–16 mm (based on the analysis of the total velocity change) and 12–16 mm (based on the accumulated strain’s relative increment change). The experimental rolling obtained two more estimations of the radius limits: 8.4–19.5 mm and 11.3–19.7 mm—based on the results of the microstructure investigation. It was confirmed that varying the kinematic and deformation parameters of radial shear rolling allows regulation of the thickness of the peripheral fine-grain layer and the diameter of the central coarse-grain layer of the rolled billets.

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“…From all kinds of severe plastic deformation which are used to receive long products with significant changes in microstructure and mechanical properties there is one that should be noted -cross rolling, particularly one of its kinds which is defined by its authors as a separate way called radial-shear rolling (RSR) [4][5]. Its difference from cross rolling (also known as a skew or helical rolling) used, for example, in pipe production [6][7] is that there is rolling of solid bar using three-high mill arrangement with large feed angles.…”

Section: Introductionmentioning

confidence: 99%

The effect of radial-shear rolling on microstructure and mechanical properties of stainless austenitic steel AISI-321

et al. 2018

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Improving the quality of metal products by crushing of the microstructure of material is one of the promising areas of modern metallurgy. The basic idea consists in refinement the grain structure of the material to sizes less than a micron, i.e. the obtaining of ultrafine-grained (UFG) materials, offering higher strength properties of the material under preservation or a small loss of ductility. Stainless austenitic steel AISI 321 is widely used in all the above areas as well as in chemical, vacuum and nuclear technology. For the obtaining of UFG structure in this material the method of radial-shear rolling is used. For the purpose of identifying the influence of radial-shear rolling on microstructure and mechanical properties of stainless austenitic steel AISI-321, the experiment was conducted where at the radial-shear rolling mill SVP-08 at 800 °C in several passes of the workpieces with a diameter of 30 mm rolled till a diameter of 13 mm with following cooling in water. The analysis of the microstructure of deformed samples showed the presence of equiaxed ultrafine-grained structure in the peripheral areas of the workpiece and the presence of elongated fibrous texture in the axial zone. The strength characteristics of the workpiece has increased more than 2 times, with a slight decrease of plasticity.

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Research on the Tendency of Inner Crack during 3-Roll Skew Rolling Process of Round Billets

Cited by 6 publications

References 2 publications

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Forming Features and Properties of Titanium Alloy Billets After Radial-Shear Rolling

Simulation of the Kinematic Condition of Radial Shear Rolling and Estimation of Its Influence on a Titanium Billet Microstructure

The effect of radial-shear rolling on microstructure and mechanical properties of stainless austenitic steel AISI-321

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