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Influence of Calculation Method on Value of Activation Energy in Hot Forming

机译:计算方法对热成型活化能值的影响

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摘要

Influence of the methodology of mathematical processing of experimental data on the calculated value of the activation energy in hot forming was evaluated for three very different alloys: iron aluminide, low-alloyed steel and magnesium alloy. Application of the mean strain rates is appropriate but calculations with use of nominal strain rates of the plastometric tests do not give significantly different results. Calculations based on the processing of the simplified power dependence between strain rate and peak stress can give the results differing very substantially from those that were gained by the solution of the complex hyperbolic relationship. This has negative impacts, particularly at prediction of the maximum flow stress in the broad range of forming conditions, represented by the Zener-Hollomon parameter.
机译:对于三种非常不同的合金:铝化铁,低合金钢和镁合金,评估了实验数据的数学处理方法对热成型活化能计算值的影响。平均应变率的应用是适当的,但是使用塑性测试的名义应变率进行的计算不会得出明显不同的结果。基于对应变率和峰值应力之间简化的功率依赖性的处理的计算得出的结果与通过复杂双曲关系的求解所获得的结果有很大的不同。这会产生负面影响,尤其是在预测由Zener-Hollomon参数表示的广泛成形条件下的最大流动应力时。

著录项

  • 来源
    《High temperature materials and processes》 |2013年第2期|149-155|共7页
  • 作者单位

    Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering,17. listopadu 15, 708 33 Ostrava, Czech Republic;

    Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering,17. listopadu 15, 708 33 Ostrava, Czech Republic;

    Technical University of Ostrava, Faculty of Metallurgy and Materials Engineering,17. listopadu 15, 708 33 Ostrava, Czech Republic;

    Silesian University of Technology, Faculty of Materials Engineering and Metallurgy, Krasinskiego 8, 40-019 Katowice,Poland;

    Silesian University of Technology, Faculty of Materials Engineering and Metallurgy, Krasinskiego 8, 40-019 Katowice,Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    hot forming; metal and alloys; strain rate; stress-strain curve; activation energy; regression analysis;

    机译:热成型;金属和合金;应变率;应力-应变曲线活化能;回归分析;

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