• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2024, Vol. 60 ›› Issue (14): 174-184.doi: 10.3901/JME.2024.14.174

• 材料科学与工程 • 上一篇    下一篇

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GH4169合金超薄带材U形弯曲回弹行为研究

贺炜林, 孟宝, 万敏   

  1. 北京航空航天大学机械工程及自动化学院 北京 100191
  • 收稿日期:2023-07-15 修回日期:2024-02-11 出版日期:2024-07-20 发布日期:2024-08-29
  • 作者简介:贺炜林,男,1996年出生,博士研究生。主要研究方向为微尺度循环塑性强化模型。E-mail:heweilin@buaa.edu.cn;孟宝(通信作者),男,1985年出生,博士,教授,博士研究生导师。主要研究方向为高性能跨尺度构件微细成形技术。E-mail:mengbao@buaa.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(51975031)。

Study on U-bending Springback Behavior of GH4169 Ultrathin Strip

HE Weilin, MENG Bao, WAN Min   

  1. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191
  • Received:2023-07-15 Revised:2024-02-11 Online:2024-07-20 Published:2024-08-29

摘要: 以镍基高温合金GH4169超薄带材为研究对象,构建了考虑晶粒尺寸和晶界的本构关系,与通过单拉试验获得的应力应变曲线对比发现,该模型可以较好地预测不同厚度和晶粒尺寸的GH4169超薄带材的流动行为。为分析材料参数和工艺参数对带材U形弯曲回弹的影响,开展了U形弯曲试验。结果表明,回弹角随晶粒尺寸、材料厚度和压边力的增大而减小,而冲压速度对回弹无显著影响。为对比晶粒尺寸、带材厚度、压边力和冲压速度对U形弯曲回弹影响程度的关系,设计了4因素3水平的正交试验,使用所建立的本构模型进行了U形弯曲回弹数值仿真。结果表明,带材厚度对回弹的影响程度最大,其次是压边力和晶粒尺寸,而冲压速度对回弹的影响最小。晶粒尺寸对三个回弹参数的影响均显著,而带材厚度对于回弹角θ2和回弹半径的影响较显著,但对回弹角θ1无明显影响,压边力对于回弹角θ1的影响最为明显,回弹半径ρ次之,对于回弹角θ2的影响最不明显。

关键词: GH4169超薄带材, U形弯曲, 回弹, 本构模型, 尺寸效应

Abstract: Ni-based superalloy GH4169 ultrathin strip was utilized as the research material, a constitutive model considering grain size and grain boundary was established. Compared with the stress-strain curves obtained by uniaxial tensile test, the model can well predict the flow behavior of GH4169 ultrathin strip with different thickness and grain size. In order to analyze the influence of material parameters and process parameters on the springback, U-bending test were carried out. The test results show that the springback decreases with the increase of grain size, material thickness and blank holder force, and the stamping speed has no significant effect on the springback. In order to compare the influence of grain size, strip thickness, blank holder force and stamping speed on springback parameters of U-bending test, orthogonal tests with four factors and three levels were designed. The numerical simulation of springback parameters of U-bending test was carried out by using the established constitutive model. The simulation results show that strip thickness has the greatest effect on springback, followed by blank holder force and grain size, and stamping speed has the least effect on springback. The grain size has a significant effect on the three springback parameters, while the thickness has a highly significant effect on the springback angle θ2 and the springback radius, but has no obvious effect on the springback angle θ1. The effect of blank holder force on the springback angle θ1 is the most obvious, and the effect of the springback radius ρ is the least obvious on the springback angle θ2.

Key words: GH4169 ultrathin strip, U-bending test, springback, constitutive model, size effect

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