5052铝合金板材热轧过程塑性变形及应力分布的三维热力耦合模拟

发布时间：2018-05-10 17:55

本文选题：铝合金 + 热轧　；参考：《材料热处理学报》2015年03期

【摘要】：对5052铝合金板材热轧过程进行了三维热力耦合模拟,综合考虑热轧过程中轧制速度、变形温度、道次压下量和摩擦系数等因素对热轧过程中轧件变形区内塑性变形和应力分布的影响,建立了多参数的热力耦合热轧模型。结果表明,在轧件变形区内,因加工硬化与动态软化的综合作用,其流变应力呈典型的动态再结晶特征。在变形区内轧件表面因金属流动剧烈,其等效塑性应变和应变速率远远大于轧件心部,塑性变形显著。轧制速度是轧件温度场分布最重要的影响因素之一,轧制速度越大,轧件的温升就越高;而温度是影响等效应力大小的主要因素,温度升高和应变速率降低都使得流变应力降低。
[Abstract]:The three dimensional thermo-mechanical coupling simulation of hot rolling process of 5052 aluminum alloy sheet was carried out, and the rolling speed and deformation temperature were considered synthetically. The influence of pass reduction and friction coefficient on the plastic deformation and stress distribution in the deformation zone of hot rolled piece was studied. A multi-parameter thermo-mechanical coupled hot rolling model was established. The results show that in the deformation zone of rolled piece, the rheological stress is typical dynamic recrystallization because of the combined action of work hardening and dynamic softening. The equivalent plastic strain and strain rate are much larger than the core of the workpiece due to the violent flow of metal on the surface of the workpiece in the deformation zone, and the plastic deformation is obvious. Rolling speed is one of the most important factors affecting the distribution of temperature field of workpiece. The higher the rolling speed, the higher the temperature rise of workpiece, and the temperature is the main factor affecting the magnitude of equivalent stress. Both temperature and strain rate decrease the flow stress.
【作者单位】：重庆大学材料科学与工程学院;国家镁合金材料工程技术研究中心;
【基金】：国家科技支撑计划项目(2012BAF09B04) 国际科技合作专项项目(2011DFR50950) 重庆市政府科技与人才计划(CSTC2013JCYJC6001)
【分类号】：TG339

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