The Effect Of First Reduction Ratio On The Interfacial Bonding Rate Of Stainless Steel Clad Plate And The Microstructure Simulation

The stress-strain relationship of 316 L stainless steel and Q235 carbon steel at 25-1400? and the strain rate of 0.001-1000s-1,and the high-temperature physical properties,such as young's modulus,Poisson's ratio,expansion coefficient and thermal conductivity,were simulated by the JMatPro in this subject.The parameters obtained by JMatPro were used to build the dynamic recrystallization model of microstructure simulation model and the material model by using DEFORM-3D finite element simulation.The hot rolling process of 316 L stainless steel and Q235 carbon steel composite plate under different first reduction ratio was simulated to find out the changing law of the interface bonding ratio and thickness ratio.The result shows that the interfacial bonding rate of stainless clad plate increased in S type curve with the increase of the reduction ratio.The simulated interfacial bonding rate of stainless clad plate was 91.5% at the reduction ratio of 40%,which was little higher than the experimental result.The thickness ratio of the stainless steel layer and the carbon steel layer increased linearly with the reduction ratio.Through the simulation of microstructure evolution of 316 L stainless steel during the rolling process,the influence of the reduction rate,rolling temperature and rolling speed on the microstructure of stainless steel and the morphology of grain growth were obtained.A fine grain morphology can be obtained in a higher compression rate and a faster rolling speed.Also,a finer grain size can be obtained by the appropriate decrease in the temperature in the rolling temperature range.Larger reduction ratio and faster rolling rate cause the reduce of grain size,and the finer grain size also can be obtained by the appropriate reduction of the temperature in the rolling temperature range.The grains with a hexagon shape were the most.the amount of the grains with more boundraies was slightly larger than that with less boundraies.In addition,the grain boundary follows to normal distribution.