Numerical Simulation On The Rolling Process Of Explosively Welded Magnesium/Aluminum Alloy Sheets

As a new kind of laminated composite, magnesium/aluminum laminatedcomposite plates can give full play to the advantages of magnesium alloy andaluminum alloy performance. Similarly, as a process for the production oflaminated composites, the explosion+rolling method can not only abandon thedisadvantages of adopting explosions method, such as poor surface quality, thickplate and so on, but also needs a lower power of mill than direct rolling.Moreover, it improves the performance of composite plates greatly. Thus, theuse of explosion+rolling method to produce magnesium/aluminum laminatedcomposite plate has good application prospects and potential commercial value.However, there will appear a large degree of bending deformation and theinterface cracking in the explosively welded plate after rolling because of thewide difference between two metals flow property during the rolling of themagnesium/aluminum explosively welded plates. Therefore, the design ofreasonable and accurate rolling process is the precondition of successfullyrolling magnesium/aluminum explosively welded plates. To date, there is no study on subsequent rolling process of AZ31B/6061explosively welded plate reported by researchers worldwide. With the rapiddevelopment and progress of computer technology, finite element numericalsimulation receives extensive concern and attention from researchers due to itsunique advantage. For this reason, in the design of rolling process ofmagnesium/aluminum explosively welded plate, numerical simulation andexperiments are combined which may provide theoretical guidance andreference for the design of rolling process.In this paper, magnesium/aluminum explosively welded plates were heattreated at300℃~400℃by holding different time. The proper holding timebefore rolling were determined according to the evolution of the interfacediffusion layer and the microstructure of the plates. Moreover, The truestress-strain curves of AZ31B magnesium alloy and6061aluminum alloy underdifferent temperature were obtained by using Gleeble1500thermal simulationtesting machine, which were imported into ANSYS/LS-DYNA finite elementsoftware to simulate the rolling deformation of the AZ31B/6061explosiveiywelded plates under different conditions. The macroscopic appearance and therelative deformation amount of interface after rolling of the composite plateswere compared and analyzed, and proper rolling parameters were determined.Finally, the holding time before rolling and proper rolling parameters from thesimulation results were combined to determine the rolling process from thick plate to thin sheet of magnesium/aluminum composite plates. At the same time,the rolling process is completely simulated and corrected. The results showedthat magnesium/aluminum explosively welded plate of15mm thick can berolled into2mm in thickness with small warpage, during the rolling process thereduction ratio was reduced gradually with the first six rolling passes at375℃and the last two rolling passes at350℃.