关于改善参数的γ-TiAl合金的约翰逊-库克构成模型的研究
Limin Shi1, Tong Wang1, Liang Wang1
1College of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080, China.
Materials (Basel, Switzerland)
|October 28, 2023
概括
这项研究增强了约翰逊-库克对-- (γ-TiAl) 合金的模型,改善了对航空航天应用在高温和应变率下热变形行为的预测.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 航空航天工程 航空航天工程
背景情况:
- -- (γ-TiAl) 合金对于航空发动机组件至关重要,因为它们具有出色的物理性能.
- 加工γ-TiAl合金的挑战,包括热导率差和高切割温度,影响零件的精度和表面完整性.
研究的目的:
- 为了研究高温和高拉伸率下 γ-TiAl合金的热变形行为.
- 提高在动态条件下 γ-TiAl合金构成模型的预测准确度.
主要方法:
- 在γ-TiAl合金样本上进行了准静态和分裂的霍普金森棒测试.
- 在20500°C的温度范围内获得了真实应力-应变曲线,应变速率为300011000/s.
- 修改了约翰逊-库克构成模型,通过多元化应变速率硬化系数和热软化指数.
主要成果:
- 开发了一种改进的约翰逊-库克模型,它准确地捕捉了应变速率,温度和应变对γ-TiAl合金行为的合效应.
- 与原始模型相比,在相关系数和绝对误差的减少方面表现出显著的改进.
- 验证了改进模型在高温,高延伸率条件下预测γ-TiAl合金的热变形的能力.
结论:
- 增强的约翰逊-库克模型提供了更准确的 γ-TiAl合金的热变形行为表示.
- 这种改进的构成模型对于航空发动机组件制造中的精确模拟至关重要.
- 这些发现有助于克服加工挑战,并确保γ-TiAl零件的几何精度和表面完整性.
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