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.
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