贾伟涛,马立峰.铸态AZ31B镁合金变温轧制过程及流变应力研究[J].稀有金属材料与工程,2016,45(1):152~158.[Jia Weitao,Ma Lifeng.Study on Temperature-changed Rolling Process and the Flow Stress of As-cast AZ31B Magnesium Alloy[J].Rare Metal Materials and Engineering,2016,45(1):152~158.]
铸态AZ31B镁合金变温轧制过程及流变应力研究
投稿时间:2014-06-14  修订日期:2014-07-02
中文关键词:  数值模拟,损伤分析,热加工图,流变应力,轧制理论
基金项目:国家973计划(2012CB722800),国家自然科学基金(51105264,51204117),中国博士后科学基金(2012M520677)
中文摘要:
      在变形温度250~450、应变速率0.005~5 下对圆柱试样进行了Gleeble高温压缩试验,并对不同初轧温度、不同轧制压下量下的热轧制过程进行了轧制试验、数值模拟及损伤分析。采用动态材料模型中的计算方法计算了热加工图,用Zener-Hollomon参数法建立了单向压缩时的流变应力模型,最后综合传热学基本原理及轧制理论,建立了变温轧制过程中的流变应力模型。研究结果表明:合理分解温度范围求解单向压缩流变应力模型,有效提高了模型的预测精度;轧制前滑区和后滑区的主传热机制有所区别,考虑到轧辊对轧件的作用力主要分布在后滑区,则此区域为边裂重点研究区域;数值模拟过程中轧件边部区域的Normalized Cockcraft and Latham损伤值最大,并且随着变形温度的降低以及道次压下量的增大而增大,此现象与轧制实验结果相符,不同轧制条件下轧制流变应力模型的求解结果与数值模拟结果较吻合。
Study on Temperature-changed Rolling Process and the Flow Stress of As-cast AZ31B Magnesium Alloy
英文关键词:numerical simulation, damage analysis,thermal processing diagram, flow stress, rolling theory
英文摘要:
      Compression tests were done at temperature ranging from 250 to 450℃,strain-rate from 0.005 to 5 s-1. The rolling test, numerical simulation and damage analysis were conducted. The thermal processing diagram was calculated by the method of dynamic material model . The material flow stress model was established by parameter method of Zener-Hollomon. Combined with the principle of heat transfer and rolling theory, the rheological stress model of hot rolling process was established. The results showed that: The model in reasonable temperature range to solve, effectively improve the prediction accuracy. The main heat transfer mechanism in forward slip area and backward slip area was different and the rolling force was mainly distributed in backward slip area, this area was the key research area of edge crack. In the rolling process, Normalized C-L damage value was maximum on sheet edge. The lower the deformation temperature and the more pass reduction, the greater the value of damage, which was consistent with the outcome of the rolling experiment. Under different rolling conditions, the results of the model solution were consistent with the numerical simulation of hot rolling process.
作者单位E-mail
贾伟涛 太原科技大学重型机械教育部工程研究中心 jwt860520@163.com 
马立峰 太原科技大学重型机械教育部工程研究中心 jwt860520@163.com 
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