Simulation And Experimental Study On Rolling Process Of Titanium/Stainless Steel Composite Plate

Titanium/stainless steel clad plate is a composite material with excellent properties of both metals.It is widely used in chemical,metallurgical and marine engineering fields and has broad market application prospects.Due to the large difference in material properties between titanium and stainless steel,it is still prepared by explosive composite method or explosive rolling composite method in industrial production.However,the explosion method has the disadvantages of large environmental pollution,low yield,and small size of the plate.Therefore,the rolling method is an ideal composite method.For the rolling composite of titanium and stainless steel,there are problems such as low composite strength and brittle compound at the composite interface,which seriously affects the development of the rolling composite method of titanium/stainless steel composite plate.Therefore,this paper adopts the blanking method of adding Ni sandwich interface vacuuming,and studies the influence of different rolling processes on the composite properties of composite plates by numerical simulation and experimental methods.This paper first studies the thermal deformation behavior of stainless steel 304 and TA2.A traditional Arrhenius constitutive model was established for stainless steel 304.Three constitutive models,such as the traditional Arrhenius constitutive model,the strain-based Arrhenius constitutive model,and the modified strain Arrhenius constitutive model,were established for industrial pure titanium TA2,and the strain Arrhenius was modified.The average relative error of the modified strain Arrhenius constitutive model is the smallest,only 3.11%.The constitutive models of the two metals are separately written and added to the DEFORM software to improve the calculation accuracy of the finite element numerical simulation.Using the above constitutive model,the composite simulation under different rolling processes was carried out by DEFORM finite element numerical simulation software.The variation law of equivalent stress,equivalent strain,temperature and warpage of the composite plate during rolling is analyzed.It is found that the composite plate can be composited at a reduction ratio of 25%to 50%,which provides a reference for further developing a reasonable rolling process.Combined with simulation analysis,a thermal simulation composite experiment was performed on titanium/stainless steel.When the compression amount was 35%,the stainless steel side was an irregular polygonal austenite structure.When the compression amount was 40%,a small amount of needle-shaped martensite was formed on the interface stainless steel side.As the amount of compression increases,the acicular martensite on the stainless steel side gradually increases.When the compression amount is 35%and 40%,the TiC compound precipitates at the composite interface.When the compression amount is 45%or 50%,the composite interface appears to be chimeric,and no TiC compound precipitates,which further improves the composite quality of the composite sample.Compared with the above hot simulation compound experiment,a Ni intermediate layer was added between the titanium and the stainless steel plate for rolling test,which effectively prevented the formation of brittle compounds such as FeTi and Fe2Ti in the composite interface.As the reduction ratio increases,the thickness of the diffusion layer at the composite interface gradually becomes wider,and the tensile strength and yield strength of the composite sheet gradually increase,which significantly increases the bonding strength of the composite panel.