Finite Element Analysis of Large Plastic Deformation Process of Pure Molybdenum Plate during Hot Rolling

Abstract

The rare molybdenum resources are being increasingly used in heavy industries. In this study, the common unidirectional and cross hot rolling operations, for pure molybdenum plates, were numerically simulated by using MSC. Marc software. An elastic–plastic finite element model was employed, together with the updated Lagrange method, to predict stress and strain fields in the workpiece. The results showed that there was a typical three-dimensional additional compressive stress (σy > σz > σx) in the deformation zone, while strain could be divided into uniaxial compressive strain and biaxial tensile strain (εy > εx > εz). Tensile stress σx increased with the accumulation of reduction and the decrease in friction coefficient at the edge of the width spread. More importantly, the interlaced deformation caused by cross-commutations, which were helpful in repairing the severe anisotropy created by unidirectional hot rolling. The evolution of the temperature field of pure molybdenum plate was investigated. The surface quenching depth of the pure molybdenum plate was about 1/6 H under different initial temperatures and reductions. In addition, the fundamental reason for the nonuniform distribution of stress and strain fields was the joint influence of rolling stress, contact friction, and external resistance. By comparing the theoretical simulation value of the model with the experimental verification data, we found that the model was aligning well with the actual engineering.

Numerical Simulation as a Tool for the Study, Development, and Optimization of Rolling Processes: A Review

“…In terms of the materials studied, aluminum alloys and steels are the most tested materials, being present in eleven and ten of the articles included in Table 1, respectively. In other studies, simulations of rolling processes have been carried out for titanium [24,34,35,43], copper [32,38], magnesium [28,39,45], and molybdenum [40] alloys and nickel-based superalloys [25,42]. In four papers, clad plates consisting of two different materials [32,35,45,48] have been studied.…”

“…Han et al [40] simulated unidirectional and hot cross rolling operations of commercially pure molybdenum plates in order to predict and analyze the temperature, stress, and strain distributions. Using Marc software, an elastoplastic FEM model was established with the updated Lagrange method.…”

“…As shown in Table 2, steel is the main alloy simulated, being studied in eleven of the twenty-four papers considered, while aluminum is present in five of them. Uranium alloy [66], magnesium alloy [28,39], and commercially pure molybdenum [40] have been considered in the other articles. Hot flat rolling is the process to which most attention is paid, as it has been simulated in nineteen of the twenty-five articles considered, varying the working temperature between 300 and 1460 °C, depending on the material studied.…”

Modular Finite Element Modeling of Heavy Plate Rolling Processes Using Customized Model Reduction Approaches

“…This results in a second essential attribute of the class, namely, the "symmetry attribute." If, as in most published models [10,[24][25][26], it is assumed that the (heavy plate) rolling process meets a good approximation of top-bottom symmetry (from now on referred to as horizontal symmetry), activating the horizontal symmetry plane in the model is expedient. Four modeling variants result from combining the consideration or rejection of horizontal and vertical symmetry.…”

Theoretical Analysis of Rolling Force during Cold Rolling with Roll Crossing and Shifting System

“…Jiao et al analysed the rolling force and the roll flattening radius of a five-stand tandem cold mill using the iterative method during online process control [8]. Several researchers have proposed analytical models to calculate the rolling force of crossed-pair hot rolling mills [13,14]. Other researchers have investigated strip profiles in asymmetrical cold rolling, investigating the influence of work roll crossing and roll shifting on the rolling force using both numerical and experimental methods [15][16][17][18].…”