TC4钛合金锻件疲劳寿命分析及其仿真模型修正  

Fatigue life analysis and simulation model modification on TC4 titanium alloy forgings

作　　者：方秀荣[1] 王自亮 杨锦辉 刘岩 Fang Xiurong;Wang Ziliang;Yang Jinhui;Liu Yan(School of Mechanical Engineering,Xi′an University of Science and Technology,Xi′an 710054,China;Zoomlion Heavy Industry Science and Technology Co.,Ltd.,Changsha 410013,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054 [2]中联重科股份有限公司,湖南长沙410013

出　　处：《锻压技术》2022年第6期1-9,共9页Forging & Stamping Technology

基　　金：国家自然科学基金面上项目(51775427,52175145)。

摘　　要：依据物理实验,研究了锻造变形温度和变形程度两个关键参量对TC4钛合金锻件疲劳寿命的影响,利用有限元与物理实验相结合的方法建立并修正了TC4钛合金锻件疲劳寿命仿真模型,并对仿真模型进行了验证。结果表明:相比于原材料,锻造成形的TC4钛合金锻件具有较长的疲劳寿命,并且变形温度控制在α+β相变温度时所得锻件的疲劳寿命最长;在最佳变形温度下,变形程度控制在50%左右时锻件的疲劳寿命最长,考虑锻造变形温度带的影响,应尽可能提高锻锤频次;锻件残余应力是影响仿真模型精度的主要因素,通过验证表明,引入实际锻件的最大等效残余应力可以极大地提高仿真精度,这为深入分析锻造工艺参量对TC4钛合金锻件疲劳寿命的影响奠定了基础。Influences of deformation temperature and deformation degree for forging on fatigue life of TC4 titanium alloy forgings were studied by physical experiments. Then, the simulation model of fatigue life for TC4 titanium alloy forgings was established and modified by combining finite element with physical experiment, and the simulation model was verified. The results show that compared with the raw materials, the forged TC4 titanium alloy forgings have longer fatigue life, and the forgings obtained by controlling the deformation temperature at α+β phase deformation temperature have the longest fatigue life. At the optimum deformation temperature, when the deformation degree is controlled at about 50%, the fatigue life of forgings is the longest. Considering the influence of forging deformation temperature zone, the forging frequency should be increased as high as possible. Furthermore, the residual stress of forgings is the main factor affecting the accuracy of the simulation model, and the verification shows that the simulation accuracy can be greatly improved if the maximum equivalent residual stress of actual forgings is engaged, which lays the foundation for in-depth analysis on the influence of forging process parameters on the fatigue life of TC4 titanium alloy forgings.

关 键 词：TC4钛合金锻件 疲劳寿命 模型修正 变形温度 变形程度 

分 类 号：TG319[金属学及工艺—金属压力加工]