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Effect of pre-deformation on creep age forming of 2219 aluminum alloy: Experimental and constitutive modelling

机译:预变形对2219铝合金蠕变时效形成的影响:实验和本构模型

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摘要

Applying pre-deformation to high strength aluminum alloy has significant impacts on shape formation and mechanical properties of component in creep age forming process. The suitable degree of pre-deformation can not only improve forming efficiency, but also attain sound mechanical properties. This paper experimentally investigates the effects of pre-deformation on creep strain, mechanical properties and microstructures of AA2219. The results show that pre-deformation can prolong the duration of primary creep stage and considerably facilitate creep strain. Through mechanical property tests, it is found that pre-stretched AA2219 possesses a high-performance "peak ageing strengthening region" with little fluctuation during creep ageing of 7-13 h. Further examinations by TEM tests indicate that this is due to the fact that the morphology of precipitates in this region remains unchanged without remarkable coarsening. Based on microstructural evolution and ageing strengthening theory, a set of physically-based creep ageing constitutive model is proposed. The developed model takes into account the effect mechanism of pre-deformation and incorporates the coupled interactions of microstructure, yield strength and creep strain. A good agreement between predicted and experimental values is achieved, which verifies the accuracy of the developed model. Hence, it provides the theoretical basis for the prediction of shape and properties in creep age forming of large-scale panel component.
机译:将预变形应用于高强度铝合金对蠕变时效成形过程中的形状成形和部件的机械性能具有重要影响。适当的预变形程度不仅可以提高成型效率,而且可以获得良好的机械性能。本文通过实验研究了预变形对AA2219的蠕变应变,力学性能和微观结构的影响。结果表明,预变形可以延长初级蠕变阶段的持续时间,并大大促进蠕变应变。通过机械性能测试,发现预拉伸的AA2219具有高性能的“峰值时效强化区”,在7-13小时的蠕变时效中波动很小。通过TEM测试的进一步检查表明,这是由于以下事实:该区域中的沉淀物形态保持不变而没有明显的粗化。基于微结构演化和时效强化理论,提出了一套基于物理的蠕变时效本构模型。开发的模型考虑了预变形的影响机理,并结合了微观结构,屈服强度和蠕变应变的耦合相互作用。在预测值和实验值之间达成了良好的一致性,从而验证了开发模型的准确性。因此,它为大型面板构件蠕变时效成形的形状和性能预测提供了理论基础。

著录项

  • 来源
    《Materials Science and Engineering》 |2017年第23期|227-235|共9页
  • 作者单位

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China,Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China,Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center, Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    2219 aluminum alloy; Pre-deformation; Creep age forming; Constitutive modelling; Microstructure; Yield strength;

    机译:2219铝合金;预变形;蠕变年龄形成;本构模型;微观结构屈服强度;

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