Structural and temperature variations during rolling of aluminium slabs

Sheppard, T.; Wright, D. S.

doi:10.1179/030716980803286513

Cited by 15 publications

(4 citation statements)

References 6 publications

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“…In general, a value of m = 1 has been accepted as fitting the data for subgrain strengthening. 1 7 However, in most works reported, the value of 0"0 appears to be anomalously low, and sometimes a negative value has been quoted. 9 This is meaningless since 0"0 represents the strength of a subgrain-free material.…”

Section: 'Substructure Strengtheningmentioning

confidence: 97%

Development of microstructure throughout roll gap during rolling of aluminium alloys

Zaidi¹,

Sheppard²

1982

Metal Science

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The mechanism of formation of substructure in the roll gap has been studied by using a specially designed roll-spring apparatus followed by rapid quenching; the metal subsequently being subjected to optical and transmission electron microscopy investigation. Experiments were conducted for single-pass and multipass deformations in order to establish the effect of a prior substructure.It is shown that an equilibrium substructure forms well before exit from the roll gap and that the accepted mechanism by which the sub grain size is altered may be in error. The authors also investigate the effect of process parameters on sub grain size and the relationships between subgrain size and room-temperature and high-temperature material properties. The experimental work was conducted using commercial purity Al and an AI-Mg alloy.MSj0665

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Section: 'Substructure Strengtheningmentioning

confidence: 97%

Development of microstructure throughout roll gap during rolling of aluminium alloys

Zaidi¹,

Sheppard²

1982

Metal Science

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“…An adiabatic condition can be assumed at a 6 mm radial distance below the work roll surface. This condition has been represented by equation (7).…”

Section: Thermal Boundary Conditionsmentioning

confidence: 99%

“…Serajzadeh et al [5] showed that the microstructural changes, the mechanical properties as well as the final dimensions of the product and roll-force depend on inhomogeneity of the temperature distribution within the metal being rolled. The evolution of temperature distribution during hot rolling has been performed by various scholars and scientists, in recent years [6][7][8]. Figure 1 shows the general configuration of strip rolling and heat fluxes that was mostly used for analysis.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneity of temperature distribution through thickness of the aluminium strip during hot rolling

Ashtiani

Bisadi

Parsa

2011

Proceedings of the Institution of Mechanical Engineers, Part C:

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Temperature distribution and inhomogeneity of its through thickness of the strip play an essential role in hot rolling processes, where both the strip and work-roll behaviour are affected strongly by these temperature fields and the microstructural and mechanical properties through thickness of hot rolled strip depend on this temperature inhomogeneity within the strip being deformed during hot rolling. In this investigation, a mathematical model was developed to predict the thermal history and inhomogeneity of temperature through thickness of an aluminium alloy strip undergoing single-stand hot plate rolling using the commercial finite element (FE) package, ABAQUS/Explicit in three dimensions. To estimate the reliability of the numerical analysis, the FE model was validated using experimental roll force and torque data and also temperature history at the centre-line of strip; good agreement was found between the two sets of predicated and experimental results. The effects of various process parameters, such as rolling speed, interface heat-transfer and friction coefficients between strip and work roll, initial thickness of the strip, and work-roll temperature and diameter on the temperature inhomogeneity, is considered.

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“…The strain, strain rate, and temperature of an element of metal passing through the roll bite during hot rolling will depend, in general, on its original position in the slab thickness; a gradation in resulting microstructure from the surface to the centre of the rolled metal would be expected, since microstructural evolution depends strongly on these parameters. [10][11][12][13] The ability to reproduce the complex strain history is based on the physical significance of equivalent strain;8 the concept of equivalent strain rate follows automatically from this. Equivalent strain is an invariant function used to simplify a complex state of strain by combining shear and compressive/tensile strains as a single scalar parameter.…”

Section: Introductionmentioning

confidence: 99%

Simulation of single pass of hot rolling deformation of aluminium alloy by plane strain compression

Timothy¹,

Yiu²,

Fine³

et al. 1991

Materials Science and Technology

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The evolution of microstructure during a single pass of laboratory hot rolling (47% reduction) of a 5083 aluminium alloy has been investigated at different positions through the thickness of the plate. The thermomechanical histories of the subsurface and centre regions of the hot rolled slab were analysed using instrumented rolling blocks andfinite element (FE) modelling; the pass history was then simulated physically using plane strain compression testing by deforming the test specimens to the appropriate equivalent strain at a representative equivalent strain rate and temperature associated with the rolling deformations. Microstructuresformed by the plane strain compression simulations were then compared with the actual hot rolled microstructures. The mainfeatures of the microstructures, particularly the sizes and volume fractions of the recrystallised grains, were reproduced very well. Experimentally determined temperature profiles, mean strain rates, and strain accumulated at the centre of the slab during rolling were in reasonable agreement with the predictions of the FE model; however, the measured strain immediately beneath the surface was much higher. The implications of these results for the modelling of multipass hot rolling are discussed briefly. MST/1351As cast5083 aluminium alloy (AI-4'5Mg-O'9Mn; allwt-%) was given an homogenisation treatment, cooled to 460°C, and hot rolled with a reduction of 47% using a laboratory

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Structural and temperature variations during rolling of aluminium slabs

Cited by 15 publications

References 6 publications

Development of microstructure throughout roll gap during rolling of aluminium alloys

Development of microstructure throughout roll gap during rolling of aluminium alloys

Inhomogeneity of temperature distribution through thickness of the aluminium strip during hot rolling

Simulation of single pass of hot rolling deformation of aluminium alloy by plane strain compression

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