| 引用本文: | 郝露菡,丛阳阳,彭艳.考虑相变的TC4钛合金流动应力研究[J].材料科学与工艺,2015,23(5):12-19.DOI:10.11951/j.issn.1005-0299.20150503. |
| HAO Luhan,CONG Yangyang,PENG Yan.Research of flow stress of TC4 titanium considering phase change[J].Materials Science and Technology,2015,23(5):12-19.DOI:10.11951/j.issn.1005-0299.20150503. |
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| 摘要: |
| 为完善TC4钛合金的塑性成形理论,必须建立准确的流动应力模型,而TC4钛合金的流动应力不仅与温度、应变速率和应变量相关,也受到βα+β相变的影响.本文通过等温实验和DSC实验研究了900 ℃时TC4钛合金的等温与连续冷却过程中的相变动力学,建立了相变动力学模型；通过Gleeble 3800热模拟机进行热压缩实验,根据实测的TC4钛合金在高温β区与低温α+β区的流动应力曲线,建立了流动应力模型；将相变动力学模型与流动应力模型结合,建立了考虑相变的流动应力模型；最后将TC4钛合金在900 ℃等温不同时间后进行压缩变形,对比实验得到的流动应力曲线与模型计算得到的流动应力曲线,验证了该模型的准确性. |
| 关键词: 塑性成形理论 流动应力模型 TC4钛合金 相变动力学 Gleeble 3800 |
| DOI：10.11951/j.issn.1005-0299.20150503 |
| 分类号:TG146.2+3 |
| 基金项目:国家科技支撑计划资助项目(2011BAF15B01); 国家冷轧板带装备及工艺工程技术研究中心开放课题资助项目(NECSR-201307). |
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| Research of flow stress of TC4 titanium considering phase change |
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HAO Luhan, CONG Yangyang, PENG Yan
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(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University,Qinhuangdao 066004, China)
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| Abstract: |
| Flow stress of TC4 alloy is not only related to temperature, strain rate and strain, but also affected by phase transformation of βα+β. In this paper, the flow stress model of TC4 alloy considering the phase transformation has been established. Firstly, the kinetics of phase change of TC4 alloy both at 900 ℃and during continuous cooling have been studied, and the kinetics model of phase transformation has been established correspondingly. Secondly, the flow stress curves of TC4 alloy during β area of high temperature and α+β area of low temperature have been tested, and the flow tress models during the two areas have been established accordingly. Finally, the flow stress model considering phase transformation has been established according to the above two kinds of model. In order to verify the model, the TC4 alloy was compressed when it is soaked at 900 ℃ for different durations, the comparison of the experimental flow stress curves and the calculated flow stress curves has demonstrated the accuracy of the flow stress model considering phase transformation. |
| Key words: plastic forming theory flow stress model TC4 alloy phase transformation kinetics Gleeble 3800 |
