TC4钛合金的电热拉伸变形行为及本构模型研究  

Research on Thermoelectric Tensile Deformation Behavior and Constitutive Model of TC4 Titanium Alloy

作　　者：顾锐 党鹏 王永军[1] 吴为 刘宝胜 曹凤超 曾元松 王明涛 GU Rui;DANG Peng;WANG Yongjun;WU Wei;LIU Baosheng;CAO Fengchao;ZENG Yuansong;WANG Mingtao(College of Mechanical and Electric Engineering,Northwest Polytechnical University,Xi'an 710072,China;AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)

机构地区：[1]西北工业大学机电学院,陕西西安710072 [2]中国航空制造技术研究院,北京100095

出　　处：《热加工工艺》2021年第22期60-66,72,共8页Hot Working Technology

摘　　要：使用CSS-44100电子万能试验机对通直流电加热的TC4钛合金试件进行单向拉伸试验,得到了TC4钛合金试件的载荷-位移曲线。在变形过程中,通过减小电流以控制材料截面积减小而导致的电阻升高,从而调整试件的温度。采用切块法,将试件均匀分段,每段视为等温,从而在变形试件上建立了温度场计算模型,进一步运用林建国的粘塑性本构模型建立了试件应力-应变的计算方程。对TC4钛合金的通电拉伸试验数据进行分析计算。结果表明:所建立的计算方法有效,可用于钛合金非绝热状态下电热单向拉伸本构模型模型参数的辨识。CSS-44100 electronic universal testing machine was used to conduct the electro-thermal uniaxial tensile tests,and the load-displacement curve of TC4 titanium alloy specimen was obtained.In the deformation process,the current was manually adjusted to control the increase of temperature of the specimen due to the section area decreasing.Adopting slab method to separate the samples into segments assumed to be isothermal,the calculating model of thermal field was built.Furthermore,the Lin’s viscoplasticity constitutive model was employed to build calculation equations for stress-strain and load-displacement curve while the sample undergoes tensile test with electric resident heating.The results show that the calculation method is verified to identify the material property parameters by analyzing the tensile test data of TC4 titanium samples.

关 键 词：TC4钛合金 通电热拉伸变形行为 温度场计算模型 粘塑性本构模型 

分 类 号：TG146[一般工业技术—材料科学与工程]