2519铝合金多道次热轧过程组织演变的数值模拟
Simulation on Microstructure Evolution of 2519 Al Alloy During Multipass Hot-rolling
陈进泽, 林启权, 张学兵, 胡文骏
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作者单位：(湘潭大学 机械工程学院, 湖南 湘潭 411105)
中文关键字：2519铝合金； 多道次热轧； 组织演变； 有限元法； 再结晶分数
英文关键字：2519 aluminum alloy; multi-pass hot-rolling; microstructure evolution; finite element method; recrystallization fraction
中文摘要：基于热模拟双道次压缩试验研究了2519铝合金变形后道次间隔时间内的软化行为，建立了静态再结晶模型。采用FORTRAN语言对有限元软件DEFORM-2D进行了二次开发，实现了2519铝合金多道次热轧过程的热力-组织耦合分析。结果表明：在多道次热轧过程中，由于外摩擦和变形区形状因子的作用，使得变形不均匀，造成再结晶百分数沿轧件厚度分布也不均匀，在前几道次上，轧件表面附近因发生较大的塑性变形而发生明显的再结晶行为，随着道次的增加，轧件心部才发生较明显的再结晶行为，使再结晶得以贯穿整个厚度。
英文摘要：The dynamic and static softening behaviors of 2519 aluminum alloy were studied during doubled-passes hot compression, and the recrystallization kinetic model was obtained. FORTRAN language was secondarily used to develop DEFORM-2D software, A heat-force-microstructure simulation on the multi-pass hot rolling of 2519 aluminum alloy was realized. The simulation results show that, during multi-pass hot rolling, the distribution of recrystallization percent is not uniform along the thickness, which causes dis-uniform deformation because of the effect of friction and figure factor of deformation zone. Recrystallization behavior occurs obviously near the surface of the workpiece at the initial passes because of big deformation, while occurs obviously in the center and impenetrates the whole thickness of the workpiece with the increase of pass.