The Physicial Simulation And Numerical Prediction Research On Hot Rolling Bonding Of Heavy-gauge Stainless Steel Clad Plate

The thickness of heavy-gauge plate is more than50mm according to the newnational steel system. More and more heavy-gauge plates are needed in the field ofmilitary and civilian for important structure. But the production of heavy-gauge plate inChina cannot meet the demand of the market. It has to be imported from abroad every year,especially the heavy-gauge plate of high performance and high added value. Theproduction of heavy-gauge plate by ingot casting is complex, need a longer time and highenergy consumption. While by rolling continuous casting slab, the thickness of thefinished product is limited greatly, and the uniformity of the steel group limited by thecompression ratio. In this paper, we adopt the method of vacuum clad rolling to productheavy-gauge plate. In this process the plate is organized into billet for electron beamwelding in a vacuum chamber, then turns to hot clad rolling. High quality plate under thepremise of large quantity, high efficiency production can be guaranteed with vacuum cladrolled, which also belong to the international advanced production methods.In this paper, hot rolling composite physical simulation experiment of similarityprinciple has been completed with304stainless steel. By observing the microstructure andsurface morphology, analyzing the phase and fracture, testing the shear strength, theinfluence of process parameters on the composite interface such as environmentatmosphere, the initial temperature, rate of deformation and reduction ratio have beenresearched. And the process of microstructure evolution and the composite mechanism ofcomposite interfaces have been discussed. Based on physical simulation experimental data,the evaluation criteria was established to research the relationship between processparameters and composite strength, which including the deformation temperature, strain,strain rate and other factors. To lay the foundation for numerical vacuum composite rollinginterface effect of prediction.The two-dimensional and three-dimensional hot rolling composite finite elementmodels were established on large commercial software MARC. Through numericalsimulation analysis the influence of various rolling parameters on the properties of the composite interface, surface cooling method was put forward to optimize rollingtechnology. Heavy plate hot rolling composite strength prediction system was establishedto research the influence of various rolling parameters on heavy plate composite strength,which provide a reference for improving the composite strength and defect controlling inthe actual production.