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摘要：
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采用三维有限元模拟软件DEFORM-3D,对片层态TC11钛合金在近β区多道次反复镦拔过程进行了数值模拟。分析了在不同火次、不同变形阶段时锻件中的温度场、应变场。通过模拟研究得到TC11钛合金多道次镦拔的最佳镦粗比为41%。每次拔长分两次压下,每次压下量为总变形量的50%。最后一火先镦粗到210 mm,将坯料翻转180°再镦粗到140 mm。采用多道次反复镦拔工艺可使初始态为粗大片层态的TC11钛合金转变为均匀的等轴态,能为后续的锻造提供合格的坯料。
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The finite element software DEFORM-3D was employed to simulate multi-pass upsetting and stretching of TC11 alloy in near β zone.The distribution of temperature and effective strain fields were investigated.Simulation results show that the optimal compression ratio of TC11 is 41% during multi-pass upsetting and stretching.The process of stretching is divided into two steps,and in each step,compression ratio is 50%.In the last pass,the workpiece should be upset to 210 mm first and rotated 180°,then upset to 140 mm.The initial coarse lamellar structure can be transferred to refined equaxied structure through multi-pass upsetting and stretching,which can provide eligible workpiece for the next forging process.
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基金项目：
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国家自然科学基金资助项目(50775211)
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作者简介：
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参考文献：
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[1]李园春,冯朝辉,林海,等.TC11钛合金盘形件锻造过程的有限元模拟[J].金属成形工艺,1997,16(6):49-52.
[2]冯斌,王忠堂,张士宏,等.TC11钛合金的高温变形力学行为[J].沈阳理工大学学报,2006,6(25):68-71.
[3]鲍利索娃E A,钛合金金相学[M].陈石卿,译.北京:国防工业出版社,1986.
[4]冯朝辉,唐志今,郝树本.钛合金锻造工艺的现状与发展[J].金属成形工艺,1998,16(3):46-47.
[5]张志芳.(α+β)变形钛合金显微组织与热变形的关系问题[J].航空材料,1982,(3):47-50.
[6]张小明,张廷杰,田锋,等.多向锻造对改善7075铝合金性能的作用[J].稀有金属材料与工程,2003,32(5):372-374.
[7]史宇麟,宋玉冰,薛秋云.大锻件两次镦拔锻造的工艺优化[J].热加工工艺,2007,36(5):51-53.
[8]史科,单德彬,吕炎.TC11钛合金叶轮等温锻造过程三维有限元模拟[J].锻压技术,2008,33(2):19-22.
[9]门菲,王忠堂,宋鸿武,等.TC11合金片状组织球化规律的研究[J].机械工程与自动化,2008,4(2):113-116.
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