应用FEM与圆环镦粗实验测定TC4钛合金高温变形时的摩擦因数  

On the Measurement of Friction Coefficient of Ti-6Al-4V Titanium Alloy Utilizing the Hot Compression Test of Ring and FE Simulation

作　　者：邰清安[1] 李晓光[1] 李治华[1] 刘艳[1] 朱艳春[2] 曾卫东[2] 

机构地区：[1]沈阳黎明航空发动机(集团)有限责任公司,沈阳110043 [2]西北工业大学材料学院,西安710072

出　　处：《材料工程》2011年第6期23-26,31,共5页Journal of Materials Engineering

基　　金：国家"973"计划(2007CB613807)

摘　　要：采用圆环镦粗与有限元模拟相结合的方法测定了TC4钛合金高温变形时摩擦因数。利用有限元模拟确定了摩擦因数的理论标定曲线,采用圆环镦粗实验确定圆环内径变化百分比与圆环高度压缩百分比的关系曲线,将圆环镦粗后的内径减小百分比与模拟得到的摩擦因数理论标定曲线进行对比,发现TC4钛合金在干摩擦和玻璃润滑剂的条件下摩擦因数分别为0.58和0.32,与国内外的研究结果吻合。采用有限元模拟确定摩擦因数理论标定曲线的方法,可以克服传统理论解析方法无法考虑的材料特性、温度和应变速率变化的影响的缺点,是测定高温变形过程中工件与模具间摩擦因数的一种非常有效的方法。A study of the friction coefficients is presented for TC4 titanium alloy at high temperature deformation using ring compression test and finite element（FE） simulation.FE simulations were used to derive the friction calibration curves,and a series of ring compression tests were carried out on the conditions of glass lubricant and dry friction to constitute the relationship between reduction in inner diameter of ring and reduction in height.It is found that the friction coefficients of TC4 titanium alloy for glass lubricant and dry conditions are determined to be about 0.32 and 0.58,respectively,which are in agreement with research results at home and abroad.The method that deriving the friction calibration curves using FEM,is not only superior to analytical methods,which can not consider the characteristics of materials,properties of touched surfaces and influence of temperature and strain rate on deformation,but also a special effectively method to determine the friction coefficients at the interface of die/workpiece during high temperature deformation.

关 键 词：摩擦因数 理论标定曲线 圆环镦粗实验 玻璃润滑 干摩擦 

分 类 号：TG146.4[一般工业技术—材料科学与工程]