TC4钛合金焊后电子束局部热处理温度场数值模拟.docVIP

TC4钛合金焊后电子束局部热处理温度场数值模拟 陈芙蓉1，张可荣1，刘方军2，毛智勇2 （1.内蒙古工业大学 材料科学与工程学院 内蒙古 呼和浩特010062； 2.北京航空制造工程研究所 北京 北京100024） 摘要：本文针对航空航天业中应用较广的TC4钛合金，采用ANSYS有限元软件，按照划分单元、逐次计算并逼近真实值的近似计算方法，对该合金电子束焊接及焊后局部热处理的热过程进行计算机数值模拟的可行性研究。结果表明，钛合金电子束焊接过程中焊接热输入较大，焊缝较窄，熔深大。可采用提高电压来增加热输入，从而间接增大焊接深宽比。通过验证，用有限元数值模拟方法得到的焊接及热处理温度场分布规律与实测温度值基本一致。 关键词：ANSYS ; 电子束局部热处理 ; 数值模拟 ; 温度场 中图分类号：TG436.5 文献标识码：A The numerical simulation of temperature field of post-weld electron beam local heat treatment in TC4 titanium alloy CHEN Fu-rong1, ZHANG Ke-rong1, LIU Fang-jun2, MAO Zhi-yong2 (1.College of Materials Science and Engineering, Inner Mongolia University of Technology, Huhhot, 010062, China; 2.Beijing aviation manufacturing engineering institute, Beijing, 100024, China) Abstract：This article aims at TC4 titanium alloy that is an alloy of extensive usage in aviation and spaceflight, adopts ANSYS software of finite element, and make use of the numerical calculation means of finite element, according to the approximately calculating method of demarcation unit, gradually compute and approach true worth. And the feasibility of calculator numerical simulation of TC4 titanium alloy that dealed with electron beam welding and the local heat treatment of electron for eliminating stress after welding are researched. The result indicates that, the heat input of titanium alloy of electron beam welding is relative big, welded seam is relative narrow, and the penetration is big. It is feasible that adopts increasing electric voltage increase heat input, thereby increasing the depth-width ratio. By proofing test, the distribution of temperature field that gained by numerical calculation means of finite element, is basically consistent of the measured value. Key words：ANSYS; electron beam local heat treatment; numerical simulation; temperature field TC4钛合金（Ti-6Al-4V），是一种α+β两相型钛基合金，属难熔合金，密度4440kg/m3，其熔化区间为1540℃~1650℃。TC4钛合金具有中等强度和适用的塑性，可焊性较好，但焊后塑性较低，断裂韧度较高[1]。现在对TC4的焊接多采用大线能量热输入的焊接方式，如电子束焊接。对于TC4钛合金焊后存在的残余应力较大的问 收稿日期： 基金项