The influence of some rolling parameters on the residual stresses after rolling

Razny, W.; Fischer, Franz Dieter; Finstermann, G.; Schwenzfeier, Werner; Zeman, Klaus

doi:10.1016/0924-0136(96)02311-4

Cited by 10 publications

(10 citation statements)

References 2 publications

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“…). [34][35][36][37][38] For the given material pairing, valid data from friction experiments are not available. Therefore, a coefficient of friction within these limits was assumed as a compromise.…”

Section: Application Discussion and Correlation With Measured Process...mentioning

confidence: 99%

“…The coefficient of friction used in the literature exhibits a broad spectrum, which ranges from 0.3 (in Razny et al and Trull et al) or 0.35 (in Ding et al and Shou‐yuan et al) to 0.8 (in Kumar et al). [ 34–38 ] For the given material pairing, valid data from friction experiments are not available. Therefore, a coefficient of friction within these limits was assumed as a compromise.…”

Section: Application Discussion and Correlation With Measured Process...mentioning

confidence: 99%

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Toward a 2D/3D Finite‐Element–Based Digital Shadow for the Approximation of Metrologically Inaccessible Dynamic Fields of State Variables during Heavy Plate Rolling

Nemetz

Parteder

Reimer

et al. 2023

steel research int.

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Heavy plates are products of global economic relevance. Due to the high requirements for this semifinished product, the trend in heavy plate processing is toward providing ever higher quality steels that, for instance, combine a predefined yield point, good weldability, and, at the same time, predefined toughness properties. Unprecedented quality requirements in steel processing can only be met if technologically relevant parameters, such as temperature, are guaranteed to be kept within a narrow tolerance range during the hotrolling process, one of the most decisive steps within the production chain for heavy plates. Within the heavy plate hot-rolling process, often performed in a reversing four-high mill stand consisting of a pair of work rolls and a pair of backup rolls, various production steps like rolling passes, descaling sequences, and cooling periods, determine the plate's temperature evolution. [1] In parallel, temperature evolution affects the microstructure and, thus, associated physical properties of the final product, such as hardness and toughness. [2] It is, therefore, of utmost importance to consider the evolution of the temperature field inside the heavy plate as a specification when planning the entire process that reaches from the slab's exit from the furnace to the last pass.All in all, the production steps of hot rolling govern the plate temperature in two fundamentally different scenarios: sufficiently far from the roll bite, the plate temperature decreases moderately through air cooling or abruptly on the surface of the plate through contact with water which is applied locally in the form of high-pressure jets provided by a water descaling unit. Inside the roll bite, the plastic deformation is accompanied by heat generation inside the plate, and simultaneously the contacting cooler work rolls reduce the temperature at its surfaces. These and other thermomechanical effects can hardly be measured, which is the reason why models are utilized for better insight. As digital transformation has become a significant innovation driver, a digital representation of the process in the form of an integrated digital model, digital shadow, or digital twin has to cover these potentially interfering thermomechanical aspects. [3,4] Modeling and simulation have been integral to the research and development of rolling processes for decades. An incomplete but representative selection of milestones, in chronological order, is intended to outline the road to comprehensive modeling approaches available today: The journey started with basic

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Section: Application Discussion and Correlation With Measured Process...mentioning

confidence: 99%

Section: Application Discussion and Correlation With Measured Process...mentioning

confidence: 99%

Toward a 2D/3D Finite‐Element–Based Digital Shadow for the Approximation of Metrologically Inaccessible Dynamic Fields of State Variables during Heavy Plate Rolling

Nemetz

Parteder

Reimer

et al. 2023

steel research int.

View full text Add to dashboard Cite

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“…Residual stresses of traditional rolled sheets have been well reported [4][5][6]. Typical residual stress distribution of a rolled sheet material is tensile at the sheet centre and compressive at the sheet surfaces [6].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Study of Al/Al Laminates Processed by Accumulative Roll Bonding

et al. 2016

Residual Stresses 2016

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Abstract. In this work accumulative roll bonding (ARB) was used to combine AA1050 and AA6061 sheets to produce AA1050/AA1050, AA6061/AA6061 and AA1050/AA6061 laminates with ultrafine grained (UFG) structure. Two sheets of starting materials were roll bonded with 200 °C preheating for 180 s before rolling. The through-thickness residual stress distribution of these laminates processed up to two cycles of ARB was determined by neutron diffraction with spatial resolution of 0.2 mm through 1.5 mm thickness. The measurements also required high accuracy of only few MPa since residual stresses in the laminates peaked at only about 15 MPa. The laminates composed of the same material (AA1050/AA1050 and AA6061/AA6061) showed symmetric residual stress profile with tensile stress at the centre of the sheets and compressive stress at the surfaces. The AA1050/AA6061 laminates showed asymmetric distribution with residual tensile stress in the AA1050 layer and compressive stress in the AA6061 layer. A finite element model (FEM) was used to simulate the residual stress distribution and the results were in agreement with the measured results qualitatively. IntroductionAluminium sheets are widely used as structural components in aircraft and automotive which has strict requirements of strength/weight ratio. Accumulative roll bonding (ARB) is an effective process to produce aluminium sheets with high strengths and it is also possible to bond two types of aluminium sheets in the hope that the properties of the original sheets would combine in the bonded laminates [1][2][3]. The materials processed by ARB generally experience larger strain magnitudes compared to traditional rolling. Furthermore, the ARB process includes rolling, cutting, surface grinding and stacking in different order, which makes the strain history complex in the bonded laminates. Microstructure, texture and mechanical properties distributions through the thickness of the laminates are non-uniform. This is especially true if different starting materials are used.In addition, layers of different materials or materials at different thickness positions perform differently upon further deformation developing residual stress which is strongly dependent on the thermomechanical processing history of the materials. Residual stresses of traditional rolled sheets have been well reported [4][5][6]. Typical residual stress distribution of a rolled sheet material is tensile at the sheet centre and compressive at the sheet surfaces [6]. Residual stress of ARB processed sheets has not been evaluated up to now and it can be inferred that the residual stress distribution of the ARB processed sheets should be more complex than that of conventional rolling since the strain history of the ARB processed sheets is complex due to the cutting and stacking procedure.

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“…4) Nonuniform rolling and uneven cooling are the main sources for non-uniform strain induced residual stress in hot rolled sheets. 5,6) Figure 2 explains bending of rolls causing nonuniform rolling of the material. In such cases, the region which is rolled more will experience compressive residual stress and to counter this compressive stress, the region which is rolled less will experience tensile residual stress.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Based Non-destructive Testing Technique for Predicting Shape Defects in Rolled Steel Sheets

et al. 2019

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Shape defect such as bow and crossbow, is one of the major defects in hot rolled sheets. These defects arise due to non-uniform plastic strain (thermal and mechanical) due to improper rolling process. In-turn this non-uniform strain induces residual stress in the rolled material. Hence measurement of residual stress in early stage helps as a Go/No Go tool, while supplying material to customers to whom shape defects are very much problematic during its downstream process. In this paper a non-destructive testing (NDT) technique has been developed to predict the magnitude of bow/crossbow based on residual stress measurement using ultrasonic technique. The technique employs the relationship between residual stress distribution and its corresponding effect towards bow/crossbow formation. The paper also elaborates about residual stress measurement using ultrasonic measurement based on the acousto-elastic theory. It was demonstrated that there exists a distinct relationship between crossbow and residual stress for high strength hot rolled steel sheets experimentally. KEY WORDS: shape defects (bow/crossbow) prediction; residual stress measurement using Lcr probe; acousto-elastic constant; ultrasonic technique to measure residual stress in rolled sheets; differential residual stress.

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The influence of some rolling parameters on the residual stresses after rolling

Cited by 10 publications

References 2 publications

Toward a 2D/3D Finite‐Element–Based Digital Shadow for the Approximation of Metrologically Inaccessible Dynamic Fields of State Variables during Heavy Plate Rolling

Toward a 2D/3D Finite‐Element–Based Digital Shadow for the Approximation of Metrologically Inaccessible Dynamic Fields of State Variables during Heavy Plate Rolling

Residual Stress Study of Al/Al Laminates Processed by Accumulative Roll Bonding

Ultrasonic Based Non-destructive Testing Technique for Predicting Shape Defects in Rolled Steel Sheets

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