北京航空航天大学学报 ›› 2020, Vol. 46 ›› Issue (5): 893-899.doi: 10.13700/j.bh.1001-5965.2019.0358

• 论文 • 上一篇    下一篇

基于M-K模型的TA15钛合金高温成形极限

毕静1,2, 马博林3, 张艳苓1,2,4, 张志1,2,4, 吴向东3   

  1. 1. 中国航空制造技术研究院, 北京 100024;
    2. 塑性成形技术航空技术重点实验室, 北京 100024;
    3. 北京航空航天大学 机械工程及自动化学院, 北京 100083;
    4. 数字化塑性成形技术及装备北京市重点实验室, 北京 100024
  • 收稿日期:2019-07-03 发布日期:2020-05-19
  • 通讯作者: 吴向东 E-mail:wuxiangdongbuaa@163.com
  • 作者简介:毕静 女,硕士,工程师。主要研究方向:金属热冲压成形;马博林 男,博士。主要研究方向:塑性成形理论、热成形工艺技术;吴向东 男,博士,副教授,博士生导师。主要研究方向:塑性成形理论、工艺与装备技术。
  • 基金资助:
    国家自然科学基金(51875027);中国博士后科学基金(2018M630058)

Hot forming limit of TA15 titanium alloy based on M-K model

BI Jing1,2, MA Bolin3, ZHANG Yanling1,2,4, ZHANG Zhi1,2,4, WU Xiangdong3   

  1. 1. AVIC Manufacturing Technology Institute, Beijing 100024, China;
    2. Aeronautical Key Laboratory for Plastic Forming Technology, Beijing 100024, China;
    3. School of Mechanical Engineering and Automation, Beihang University, Beijing 100083, China;
    4. Beijing Key Laboratory of Digital Forming Technology and Equipment, Beijing 100024, China
  • Received:2019-07-03 Published:2020-05-19

摘要: 为了探究TA15钛合金高温环境下的成形极限,明确本构方程中参数对成形极限的影响规律,建立了考虑高温软化效应TA15钛合金高温环境下的本构关系,利用高温成形极限试验平台及M-K失稳理论对TA15钛合金板高温环境下的成形极限分别进行了试验测试及理论预测。理论预测结果表明当温度从800℃提升至880℃时,平面应变状态下的极限主应变由0.18提升至0.33。基于M-K失稳理论和建立的高温本构模型,分析了本构方程中的参数对成形极限的影响规律,结果表明提高加工硬化指数、速率敏感因子及减小软化因子,均可以提升应变强化率的大小,进一步延缓沟槽内应变状态趋于平面应变状态,从而提升理论成形极限曲线在应变空间中的位置。此外,理论计算结果表明速率敏感因子对成形极限曲线的左侧影响程度要大于其对右侧部分的影响,该现象主要归因于速率敏感因子对不同应变大小下的应变强化率的影响不同。

关键词: TA15钛合金, 塑性失稳, 高温成形极限, M-K失稳理论, 本构模型

Abstract: In order to investigate the forming limit of TA15 titanium alloy at high temperature and clarify the influence of parameters in the constitutive equation on the forming limit, the constitutive relationship of TA15 titanium alloy in high temperature environment was established considering the high temperature softening phenomenon, and meanwhile, the forming limit of TA15 titanium alloy plate at high temperature was obtained by high temperature forming limit test platform and theoretical predicted through applying the M-K instability theory, respectively. The theoretical results indicate that the major strain under the plane strain state increases from 0.18 to 0.33 when the temperature increases from 800℃ to 880℃. Based on the M-K instability theory and the established high temperature constitutive model, the influence of the parameters in the constitutive equation on the forming limit is analyzed. The results show that, increasing the values of hardening index and the rate sensitivity factor, and decreasing the value of the softening factor can increase the strain hardening rate, and consequently the strain state in the groove region is delayed approaching the plane strain state. Therefore the position of the forming limit curve in strain space is improved. At the same time, the theoretical calculation results show that the influence of the strain rate sensitivity factor on the left side of the forming limit curve is greater than that on the right side, and it is attributed to the fact that the effect of the strain rate sensitivity factor on the strain hardening rate under different strain size is different.

Key words: TA15 titanium alloy, plastic instability, hot forming limit, M-K instability theory, constitutive model

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