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

作　　者：徐新生 闫俊霞 何雪明 张皓晔 XU Xinsheng;YAN Junxia;HE Xueming;ZHANG Haoye(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment Technology,Jiangnan University,Wuxi,Jiangsu 214122,China;School of Mechanical Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China;Wuxi Hongda Forging Co.,Ltd.,Wuxi,Jiangsu 214122,China)

机构地区：[1]江南大学江苏省食品先进制造装备技术重点实验室,江苏无锡214122 [2]江南大学机械工程学院,江苏无锡214122 [3]无锡宏达重工股份有限公司,江苏无锡214122

出　　处：《轻工机械》2022年第3期43-49,共7页Light Industry Machinery

基　　金：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)。

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1000℃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。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℃,αphase start directionβwhen the temperature reaches 1000℃,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 firstβphase toα+βphase 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.

关 键 词：TC4钛合金 相变模型 标准差 高径比 温度骤降区 

分 类 号：TG316.2[金属学及工艺—金属压力加工] TH142[一般工业技术—材料科学与工程]