Simulation and Experimental Study on Grain Size Evolution of P-ECAP Extrusion Magnesium Alloy Hollow Plate
SHI Lei1,2, LIU Yi1, SHEN Junfang1, JIN Wenzhong1, WANG Li1, ZHANG Wei1
1 School of Material Science & Engineering, Luoyang Institute of Science and Technology, Luoyang 471023 2 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023
Abstract: In order to confirm the optimum extrusion parameters for ZK60 magnesium alloy,the influences of extrusion parameters on the grain size were studied.Finite element modeling (FEM) was applied for predicting the grain size evolution in extruded ZK60 magnesium alloy and simulated results were experimentally validated. First, microstructure evolution of ZK60 magnesium alloy during deformation was studied by means of isothermal compression test. Second, microstructure evolution was analyzed, and the obtained information was used to fit a dynamic recrystallization model implementing inside the Deform-3D FEM code environment. FEM of deformation of ZK60 magnesium alloy have been established and validated by grain size comparison. Finally, the obtained dynamic recrystallization model was applied to hollow plate extrusion by using a portholes-equal channel angular pressing (P-ECAP) die. The finite element analysis results showed that coarse DRX grains occured in the strengthening rib of extruded plate at higher temperature and in the extruded plate at the faster speed of the ram. The test results showed that material from the front end of the extruded plate has coarse grains and other extruded has finer grains. The grain structure displays approximate equiaxed structure in transverse directions and bands of elongated grains in the longitudinal section. Prediction technique, influencing factor and influence law on grain size evolution in extrusion processing were expounded.
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2019, Vol. 33 
