CAJ | 학술논문

采用Gleeble-3500热模拟试验机对AZ31镁合金挤压板坯进行平面应变压缩实验，研究镁合金二次变形条件下的热变形行为。结果表明，AZ31镁合金挤压板坯二次变形中发生明显的动态再结晶，进一步细化了再结晶晶粒，且二次变形削弱了挤压板坯的(0002)基面织构强度。DEFORM 3D有限元模拟结果表明，当应变速率一定时，变形温度是决定再结晶晶粒大小的主要因素，而当变形温度一定时，高应变速率所引起的显著温升不利于应变累积，因而再结晶晶粒细化效果并不明显。
채용Gleeble-3500열모의시험궤대AZ31미합금제압판배진행평면응변압축실험，연구미합금이차변형조건하적열변형행위。결과표명，AZ31미합금제압판배이차변형중발생명현적동태재결정，진일보세화료재결정정립，차이차변형삭약료제압판배적(0002)기면직구강도。DEFORM 3D유한원모의결과표명，당응변속솔일정시，변형온도시결정재결정정립대소적주요인소，이당변형온도일정시，고응변속솔소인기적현저온승불리우응변루적，인이재결정정립세화효과병불명현。
The plain strain compression experiment of AZ31 magnesium extruded sheet was performed on thermal simulation machine Gleeble-3500 in order to investigate the secondary deformation behavior. The results show that the dynamic recrystallization occurs during the secondary deformation of AZ31 magnesium extruded sheet, resulting in the further refinement of grain size of extruded sheet and the weakening of (0002) basal texture. The numerical simulation based on DEFORM 3D shows that the recrystallized grain size depends strongly on the deformation temperature at a constant strain rate, while at a constant deformation temperature, the higher temperature increment resulted from the higher strain rate is unfavorable for the accumulation of strain and then reduces the effect of secondary deformation on the grain refinement.