| 徐新生1,2， 闫俊霞1,2， 何雪明1,2， 张皓晔.TC4钛合金自由锻过程相变模拟与工艺分析[J].轻工机械,2022,40(3):43-49 |
| TC4钛合金自由锻过程相变模拟与工艺分析 |
| Phase Transformation Simulation and Process Analysis of TC4 Titanium Alloy in Free Forging Process |
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| DOI：10.3969/j.issn.1005 2895.2022.03.007 |
| 中文关键词: TC4钛合金 相变模型 标准差 高径比 温度骤降区 |
| 英文关键词:TC4 aluminum alloy phase transition model standard deviation height diameter ratio temperature drop zone |
| 基金项目:国家自然科学基金资助项目(51275210)；国家自然科学基金资助项目(51975251)；江苏省食品先进制造装备技术重点实验室自主研究课题资助项目(FMZ2018Y2)；江苏省产学研联创项目(1078081606192480) 。[ZK）] |
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| 中文摘要: |
| 为了揭示TC4钛合金自由锻过程中相的演变规律，课题组建立了TC4钛合金的相变模型，对其成形工艺进行数值模拟，并利用平均值和标准差值作为评价指标，对模拟结果进行分析。结果显示：温度在700 ℃左右时，α相开始向β相发生转变，当达到1 000 ℃后，转变率达到100.0%直至加热结束；镦粗的最佳高径比为2.5，锻件对应的平行边距D=410 mm；锻件与模具接触处形成温度骤降区，首先发生β相到α+β相的转变，2相占比平均值呈相反演变趋势，标准差值为相同演变趋势。基于模拟的锻造工艺，能够有效地缩短试验周期，提高产品合格率，本研究为大型钛合金自由锻工艺提供了参考。 |
| 英文摘要: |
| In order to reveal the phase evolution law of TC4 titanium alloy in the free forging process, the phase transformation model of TC4 titanium alloy was established, the forming process was numerically simulated, and the simulation results were analyzed by using the average value and standard deviation as evaluation indexes. The results show that when the temperature is about 700 ℃, α phase start direction β when the temperature reaches 1 000 ℃, the transformation rate reaches 100% until the end of heating; the optimum height diameter ratio of upsetting is 2.5, and the corresponding parallel edge distance of forging is D=410 mm; a sudden temperature drop zone is formed at the contact between the forging and the die, which occurs first β phase to α+β phase for phase transformation.The average value of two phase proportion shows the opposite evolution trend, and the standard deviation shows the same evolution trend. The forging process based on simulation can effectively shorten the test cycle and improve the qualified rate of products.The study provides a reference for the free forging process of large titanium alloy. |
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