Influence of forming parameters on static recrystallization behaviour during hot rolling aluminium alloy 5083

Abstract

In this paper, the influence of rolling parameters (i.e. rolling temperature, roll speed, roll temperature, friction and the ratio of the mean thickness to the contact length in the roll gap Hm/L) on static recrystallization (SRX) behaviour is studied by the combination of the finite element method (FEM) with the Taguchi experimental method. The FEM is first applied to simulate a single pass laboratory rolling experiment by the use of both empirical and physical models. A new approach is used to generate the mean value of the Zener-Hollomon parameter, which is necessary for the prediction of the volume fraction recrystallized (XV) when the empirical SRX model is used. A physical model which considers the density of recrystallization nuclei and the total stored energy is also applied based on the prediction of internal dislocation density, subgrain size and misorientation. The predicted XV and the recrystallized grain size at the centre and subsurface fit well with experimental measurements from the literature. Then, the Taguchi method is applied to design an orthogonal experimental table, L9({34}), which indicates that there are four parameters, each parameter has three levels and a total of nine test runs need to be conducted. These nine virtual experiments are analysed by the use of FEM. The predicted results are then analysed by the use of the Taguchi method from which the influence of each rolling parameter on XV is given. The studies show that rolling temperature has the greatest influence on XV for the centre point whilst friction is the most important parameter on the determination of XV within the surface region. The roll temperature and roll speed have little influence on XV for both the centre and subsurface point.

Mathematical Modeling of Multipass Hot Deformation of Aluminum Alloy AA5083—Model Development and Validation

“…Duan et al integrated a semi-empirical physically based state variable model into an finite element (FE) analysis and applied it to an AA5083 aluminum alloy. [2,12] However, the microstructure predictions were unsatisfactory for a single pass rolling case, where the model underpredicted the recrystallized fraction as compared to the measured data. [2] Ahmed et al recently presented a successful integration of this model and experimental validation for single-pass rolling conditions.…”

“…[2,12] However, the microstructure predictions were unsatisfactory for a single pass rolling case, where the model underpredicted the recrystallized fraction as compared to the measured data. [2] Ahmed et al recently presented a successful integration of this model and experimental validation for single-pass rolling conditions. [3] The next step is to combine a state variable-based microstructure model with FE analysis for industrial-scale multipass rolling of aluminum alloys.…”

“…[1] One method of understanding microstructure development is to develop physically based mathematical models that predict the microstructure evolution at each stage of the process and thereby achieve a greater understanding of the effect of the process variables on the properties of the final product. Although modeling of single pass hot rolling of aluminum alloys has been studied previously, [2,3] the reported work in modeling of multipass hot rolling is limited in the literature, such as the approaches reported by Reyes et al and Vatne et al, for example. [4,5] Multipass hot rolling is particularly important in situations where various levels of recrystallization may occur between passes.…”

Approaches to Modeling of Recrystallization

“…It is worth noting that this approach involves an evolution law for the subgrain misorientation, taking the misorientation as an averaged quantity. This formulation is used in simulation of SRX during thermo-mechanical processing in [73] and in relation to hot rolling in [74,75]. The formulation is also discussed in the review paper [23].…”

Uniform Equiaxed Grain Structure throughout Thickness of a Hot-Rolled 5083 Al-Mg-Mn Alloy Thick Plate after a Tempering Treatment at 350°C

“…3) Additionally, Duan and Sheppard 4) analyzed 5083 Al-Mg alloy by the FEM method to determine the strain inside the material and the microstructural change due to rolling. This result suggests that during rolling, the dislocation density and stored energy drop from the surface to the center in the thickness direction through the material.…”