Study On Material Proportion Of Vacuum Coating Interlayer For Composite Plate Preparation

Response to the demand for steel of marine offshore equipment materials in extreme environments,focus on the technical difficulty of how to thin the composite plate interlayer under vacuum coating,2205/Fe-Co-Ni/EH40 stainless steel composite plate as the research object,the study of Fe-Co-Ni alloy melt interlayer coating ability as the entry point,the preparation of a clean bonding interface of stainless steel composite plate as a foothold,the mechanism of the coating interlayer under different alloy proportions is explored.Base on the above the interlayer coating scheme is determined.The effect of coating the resulting stainless steel composite slab on the bonding interface of plates is investigated through the technology of interlayer coating molding and composite plate forming.Based on the control law of fluid dynamics and alloy solidification theory,considering the heat dissipation of the alloy melt and the synergistic force of pressure differential and gravity in the interlayer,the mathematical model of interlaminar vacuum coating heat transfer is established.the effects of thermal physical parameters such as alloy viscosity and surface tension on the interlaminar vacuum coating with different material proportions is investigated.the an Fe-Co-Ni alloy proportioning scheme was established through the orthogonal experiments.This work will provide theoretical guidance for the following FeCo-Ni alloy interlaminar vacuum coating process.Through Pro CAST finite element simulation technology,a multi-field coupled threedimensional model of Fe-Co-Ni interlaminar vacuum coating is established to study the effects of initial coating temperature,coating pressure differential,the ratio of suction port to interfacial width on the temperature velocity and stress fields during the interlaminar coating process.The interlayer coating rate,shrinkage rate and residual stress as evaluation indicators,the preferred interlaminar vacuum coating process parameters are established by orthogonal experiments and intuitive analysis.This work will provide theoretical basis for the following vacuum coating experiments.Relying on the ingot mold rotating vacuum arc melting/suction casting system,stainless steel composite plate interlaminar vacuum coating experiments are carried out.Based on the alloy proportion scheme and the preferred coating parameters,a complete coated alloy interlayer is obtain.The quality of interlayer coating is evaluated by OM SEM and EDS techniques.The effects of different alloy proportions and process parameters on the coating rate are analyzed,and compared with the model calculations and coating simulation results for verification.Based on the two-roller mill,interlaminar vacuum coated stainless steel composite slabs on five passes of hot roll forming experiments are carried out.The characterization experiments such as microstructure,hardness and element diffusion experiments are carried out.Post-rolling composite bonding interfacial elemental distribution and interfacial oxides are analyzed to evaluate the interlayer properties.The properties of the composite plate after rolling are measured to evaluate the bonding properties and overall mechanical properties of the composite plate.After the above research work,the interlayer thickness by vacuum coating process is reduced by 23%.The 2205/Fe-Co-Ni/EH40 composite plate with high interfacial cleanliness,good bonding strength and low preparation cost is obtained,which provided the theoretical basis for the subsequent preparation of stainless steel composite materials with high clean bonding interface and high bonding strength.