| Hot rolled stainless steel clad plate is a kind of laminar composite made by stainless steel as clad layer and low alloy steel as base layer,which is bonded under thermo-mechanical coupled effect.The stainless steel clad plate is widely used for the reduction of precious metals consumption and equipment manufacturing cost.Reasonable process parameters affect interface bonding quality which is key factor to evaluate performance of stainless steel clad plate.In order to obtain the high quality vacuum hot rolled 316L/Q345 R stainless steel clad plate,the interface bonding characteristics of clad plate were studied by numerical simulation and experiment.In this paper,the physical simulation experiment was applied to obtain the true stress-strain curves and thermophysical parameters of 316 L and Q345 R,and the macro-scale and meso-scale simulation models of stainless steel clad plate were established by DEFORM-3D.The multi-scale coupling simulations of clad plate under different rolling parameters were carried out,and the interface bonding state was determined according to the judging criterion.Combined with the analysis of the grain size and distribution,reasonable hot rolling forming parameters were developed.The seven pass hot rolling process of stainless steel clad plate was simulated by numerical simulation,and the distribution of temperature field was analyzed.The change law of residual stress in each pass was analyzed,and the residual stress distribution at the surface of clad plate was studied.The distribution of stress-strain field and rolling force were studied.The hot-rolled billet of stainless steel clad plate was prepared by vacuum symmetry formation technology,and the vacuum hot rolling experiment of clad plate was carried out according to numerical simulation results.The microstructures,interfacial inclusions and element diffusion of the base layer,clad layer and interface were tested by metallurgical microscope and energy spectrometer.The hardness was measured by vickers hardness tester,and the hardness change curve was illustrated.The mechanical properties were measured by mechanical property test,and the accuracy of the numerical simulationresults was verified.Through the research above,the macroscopic behavior,mesoscopic behavior and microstructure and properties of stainless steel clad plate were studied by numerical simulation and experiment,which can provide guidance for the preparation of stainless steel clad plate. |
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