Study On Mechanical Properties And Deformation Characteristics Of Rolled Clad Plate

Rolled composite sheets are very important composite material that combines the functionality of the composite sheet such as corrosion resistance,high temperature tensile strength and structural properties of the substrate to provide excellent deformation characteristics of the composite material and reduce production costs.However,the rolled composite panels are limited by factors such as the manufacturing process,production conditions,and service environment.During the rolling process,large residual stresses due to phase transitions and different coefficients of thermal expansion will affect the mechanical properties.The influence of deformation characteristics,even the effect on stress corrosion resistance;and the change of mechanical properties in service at different thickness ratios or high temperature conditions,will have a greater impact on subsequent processing performance and performance,and thus will be triggered in actual use.Serious quality accidents have great practical application value for the study of deformation characteristics and influencing factors of rolled composite plates.Taking a series of 8925/X52,3Cr13/Q345 and 2205/AH36 rolled composite plates produced by a steel company as an example,the mechanical properties and deformation characteristics of the rolled composite plates were investigated through a series of experiments,and the mechanical properties and deformation were analyzed.The influencing factors of behavior,and the determination of residual stress and stress corrosion resistance,provide a scientific basis for the deformation process of the composite board with good comprehensive mechanical properties in the actual production process.In order to investigate the mechanical properties and microscopic plastic fracture behavior of the rolled composite panels,the paper firstly carried out the normal temperature stretching,high temperature stretching,three-point bending and in-situ tensile experiments.The experimental results show that in the normal temperature tensile test,the composite plate has excellent mechanical properties,that is,the elongation is improved,and the tensile strength is only slightly reduced;in the high temperature tensile test,the composite is increased with the increase of temperature.The stress-strain curve of the plate shows a downward trend,the tensile strength also decreases,and the elongation increases continuously,showing good plastic processing ability.The stress-strain curve of the 8825/X52 composite plate conforms to“superplasticity”.The tensile curve characteristic of the material;in the three-point bending experiment,in the experiment where the bending to the two arms are parallel to each other,the composite plate shows good bending deformation ability,and at the end of the deformation,the curved outer surface of the sample has no naked eye.Visible defects;in the in-situ tensile test,the composite plate undergoes a long crack metastable expansion stage,and then the fracture is unstable,and the crack at the interface occurs after the tensile load reaches the maximum value,indicating the composite prepared by the rolling process.The board has good toughness and plasticity and interface bonding strength.In order to determine the mechanical properties of the rolled composite plate and the influencing factors of the deformation characteristics—residual stress,a new residual stress measurement method proposed by the research group,namely“specific tolerance method”,is used to calculate the three-dimensional residual stress at the interface of the composite plate.Measurement analysis was performed.The results show that at the interface of the composite plate,the volume change caused by the uneven phase transformation of the single-layer component produces uneven stress,wherein the stress component in the normal direction is numerically large,and the lateral stress is about 5 times to an order of magnitude.In order to determine the stress corrosion resistance of the rolled composite plate,this paper takes the 8825/X52 composite plate as an example to study the stress corrosion resistance from the natural corrosion potential and the specific potential applied by the external power source,namely the immersion test and the electrochemical corrosion test.The results show that under the experimental conditions of 3.5%NaCl,the maximum corrosion rate is 0.0026g/(m~2×h),which translates to a relative mass change of 0.098‰;on the other hand,the corrosion current density is reduced by 5.5%,the charge transfer resistance differs by less than 12%.