(1. 西北工业大学 材料学院，西安 710072；
2. 沈阳黎明航空发动机(集团)有限责任公司，沈阳 110043)
摘 要: 对TC4钛合金在变形温度为940 ℃、外径、内径和高度之比为20:10:7的圆环进行圆环镦粗实验，并采用有限元软件DEFORM−3D对镦粗过程进行模拟。结果表明：热传导系数对摩擦因数的测定有很大影响，热传导系数增加导致工件与模具的接触面温度下降，摩擦增加；对于不同的润滑介质应采用不同的热传导系数进行模拟，从而建立不同的理论校准曲线。采用不同的热传导系数分别建立玻璃润滑和干摩擦条件下的理论校准曲线，结合圆环镦粗实验，最终得出TC4钛合金940 ℃高温变形时在干摩擦和玻璃润滑条件下的摩擦因数值分别为0.59和0.42。
关键字: 圆环镦粗实验；有限元模拟；热传导系数；摩擦因数
（1. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;
2. Avic Shenyang Liming Aero-Engine (Group) Co., Ltd., Shenyang 110043, China）
Abstract:The ring-compression test of Ti-6Al-4V alloy was carried out at 940 ℃ and the ratio of outer diameter, inner diameter, height of 20:10:7. And the ring compression process was simulated by means of DEFORM−3D software. The results show that the effect of heat-transfer coefficient on measurement of friction factor is significant. The increase of heat-transfer coefficient results in the decrease of interfacial temperature between the workpiece and dies, and in turn leads to the increase of friction. Therefore, for various lubricant media, different heat-transfer coefficients should be chosen to conduct the FE simulation and establish different calibration curves. Combined with the ring-compression test, different heat-transfer coefficients for glass lubricant and dry friction condition are selected to establish the calibration curves, and finally the friction factors of TC4 titanium alloy under high temperature (940 ℃) deformation for dry friction and glass lubricant condition are determined to be about 0.59 and 0.42, respectively.
Key words: ring-compression test; FE simulation; heat-transfer coefficient; friction factor
