(中国船舶重工集团公司 第七二五研究所，洛阳 471039)
摘 要: 在Gleeble-1500型热模拟压缩机上对Ti6321钛合金在温度为850~990 ℃、应变速率为0.01~10.0 s-1、变形程度为60%的条件下进行了热模拟压缩实验。结果表明：Ti6321合金在变形开始阶段，流动应力随应变的增加迅速增加至峰值，随着变形的继续进行流动应力开始下降并逐渐趋于稳定；变形温度升高和应变速率减小使峰值应力显著降低。利用多元回归分析建立Ti6321钛合金在高温变形时的流动应力模型，模型的计算值与实验数据的平均相对误差为6.59%，该模型较好地描述Ti6321钛合金在高温变形过程中的流动行为。
关键字: Ti6321钛合金；热模拟压缩；工艺参数；变形行为；流动应力模型
（Luoyang Ship Material Research Institute, Luoyang 471039, China）
Abstract:The isothermal compression of Ti6321 titanium alloy in the deformation temperature range from 850 to 990 ℃, the strain rate range from 0.01 to 10.0 s-1 and the deformation degree of 60% was conducted on a Gleeble-1500 isothermel compressor. The results show that the flow stress of Ti6321 titanium alloy increases quickly with the strain and reaches a peak, then decreases slowly to a near steady value. The peak stress significantly decreases with the increase of deformation temperature and decrease of strain rate. The flow stress model Ti6321 titanium alloy during high temperature deformation was established by using the regression method. The average relative difference between the calculated and experimental flow stress is 6.59%. The flow stress model can efficiently predict the deformation behavior of Ti6321 titanium alloy during high temperature deformation.
Key words: Ti6321 titanium alloy; isothermal compression; processing parameters; high temperature deformation behavior; flow stress model
