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基于高速摄影技术的Ti60钛合金热压缩变形开裂准则研究
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西北工业大学材料学院

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study of fracture criterion in hot compression of Ti60 titanium alloy by high-speed photography
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Northwestern Ploytechnical University

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    摘要:

    金属材料的韧性断裂是塑性加工过程中常见的失效形式和影响热加工性的重要因素,历来都是先进塑性加工领域的研究热点之一。通过构建开裂准则来准确预测金属热变形过程中的开裂行为对于优化材料加工工艺参数,提高产品质量具有重要的意义。本文以Ti60高温钛合金为研究对象,提出一种采用高速摄影技术来确定钛合金热压缩过程中临界开裂应变的新方法,该方法通过采用两个对称分布的高速摄影仪来准确捕获裂纹形核的位置以及裂纹扩展路径,可成功地获得热变形过程中的临界开裂应变。最终基于Oh准则,通过引入Zener-Hollomon因子,建立了可以考虑温度和应变速率综合影响的Ti60钛合金热变形的韧性开裂准则。采用FORTRAN语言二次开发子程序将热变形开裂准则嵌入商用有限元软件DEFORM-3D中,对大规格Ti60合金铸锭热镦开裂行为进行预测,验证了模型的有效性。

    Abstract:

    The ductile fracture of metal materials, which is the most common failure mode and important factor for hot workability in plastic forming, is always the research focus in the field of advanced plastic processing. A new fracture criterion is thus necessary to accurately predict the hot deformation fracture for the optimization of processes and improvement of products. In present study, a novel high-speed photography is introduced to determine the critical fracture strain of Ti60 high-temperature titanium alloy during hot compression deformation. This method can precisely captures the nucleation site and propagation process of cracking by two high-speed cameras fixed on opposite sides of the specimens, and thus is an efficient method to determination of the critical fracture strain in hot deformation processes. Based on Oh criterion, a new hot deformation fracture criterion considering strain rate and temperature effects is built and can be modeled as the function of Zener-Holloman parameter. By combining the DEFORM-3D simulation software and FROTRAN language, fracture initiation in the upsetting of large size Ti60 ingot can be precisely predicted which shows that the proposed prediction model is effective and practicable.

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彭雯雯.基于高速摄影技术的Ti60钛合金热压缩变形开裂准则研究[J].稀有金属材料与工程,2016,45(2):399~403.[pengwenwen. Study of fracture criterion in hot compression of Ti60 titanium alloy by high-speed photography[J]. Rare Metal Materials and Engineering,2016,45(2):399~403.]
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  • 收稿日期:2014-03-28
  • 最后修改日期:2015-01-15
  • 录用日期:2015-02-06
  • 在线发布日期: 2016-07-19
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