摘要
目的定量分析影响惯性摩擦焊接头质量的关键因素——焊接过程高温区的温度特征。方法选取TC4钛合金为研究对象,综合运用有限元仿真及界面组织观察的研究方法,分析确定惯性摩擦焊过程中高温区的温度特征。针对初始转速分别为1000 r/min及1200 r/min的2种惯性摩擦焊工况开展实验,并建立了热-力耦合有限元仿真模型对惯性摩擦焊过程进行仿真分析。结果仿真得到的温度分布与焊接过程摩擦界面附近的测温结果吻合良好,仿真模型与实验分析结果均表明,与初始转速为1000 r/min相比,初始转速为1200 r/min时的接头的飞边更大,2种焊接工况下仿真得到的轴向缩短量均与实验结果吻合良好,表明了仿真模型对TC4钛合金惯性摩擦焊热-力过程分析的准确性。结论在TC4钛合金圆棒样品惯性摩擦焊过程中,摩擦界面附近存在高温区,高温区内的温度呈现出芯部低、外围高的特点,最高温度约出现在沿半径方向1/2半径处。在初速转速为1000 r/min及1200 r/min的焊接工况下,芯部温度约为720℃与780℃,外围的最高温度分别约为850℃与920℃。接头组织观察结果进一步证实了仿真得到的高温区的温度数值的准确性。
The work aims to analyze the temperature characteristics of the high-temperature zone during the inertia friction welding(IFW)process,which are key factors affecting the welding quality.TC4 titanium alloy was taken as the research object and finite element simulation and interfacial microstructure observation were used to analyze the temperature characteristics of the high-temperature zone during the inertia friction.Experiments were carried out on two IFW conditions with initial rotation speed of 1000 r/min and 1200 r/min respectively,and a thermo-mechanical coupled finite element simulation model was established to simulate and analyze the IFW process.The temperature distribution obtained from the simulation matched well with the temperature measurement results near the friction interface during the welding process.Both the simulation and experimental analysis have shown that the flash obtained of the joint obtained at an initial rotation speed of 1200 r/min was larger than that at 1000 r/min.The axial shortening obtained by simulation under both welding conditions was in good agreement with the experiment,indicating the accuracy of the simulation model in analyzing the thermal-mechanical process of IFW of TC4.Further analysis indicates that there is a high-temperature zone near the friction interface during IFW process of the TC4 rod workpieces,and the temperature in the high-temperature zone is characterized by low in the center and high in the periphery,with the highest temperature occurring at about 1/2 radius along the radius direction.Under the welding conditions at initial rotation speed of 1000 r/min and 1200 r/min,the center temperatures are about 720℃and 780℃,respectively,and the highest temperatures in the periphery are about 850℃and 920℃,respectively.The joint microstructure observation further confirms the temperature obtained by the simulation at high-temperature zone.
作者
张永强
刘浩
唐天祥
史清宇
陈高强
张春波
梁武
周军
ZHANG Yongqiang;LIU Hao;TANG Tianxiang;SHI Qingyu;CHEN Gaoqiang;ZHANG Chunbo;LIANG Wu;ZHOU Jun(AECC Shanghai Commercial Aircraft Engine Manufacturing Co.,Ltd.,Shanghai 201306,China;State Key Laboratoryof Clean and Efficient Turbomachinery Power Equipment,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;Harbin Welding Institute Limited Company,CAM,Harbin 150028,China)
出处
《精密成形工程》
北大核心
2024年第10期115-123,共9页
Journal of Netshape Forming Engineering
基金
国家重点研发计划(2022YFB3404905)。
关键词
惯性摩擦焊
温度场
钛合金
有限元
模拟仿真
inertia friction welding
temperature fields
titanium alloys
finite element analysis
numerical simulation
