(中国船舶重工集团公司 第七二五研究所，洛阳 471039)
摘 要: 利用金相显微镜、力学性能测试、插片法等手段，系统研究了不同冷却速率(水冷、PAG冷和风冷)对TC4合金圆盘形变量、显微组织和力学性能的影响。结果表明：从水冷、风冷到PAG冷，随着冷却速率的降低，圆盘变形程度逐渐减小，室温拉伸强度从水冷、PAG冷到风冷逐渐降低，塑性逐渐升高。PAG溶液作为钛合金的新型淬火介质，可有效降低TC4合金薄壁件的淬火形变量，提高合金的综合性能。
关键字: 钛合金；冷却速率；形变；显微组织；拉伸性能
（Luoyang Ship Material Research Institute, Luoyang 471039, China）
Abstract:The effect of cooling rate after solution treatment on the distortion, microstructure and mechanical properties of TC4 alloy disk was systemically investigated by means of optical microscopy(OM)，mechanical properties and distortion measurements. Cooling modes include water quenching, air quenching and PAG quenching. The results show that the distortion decreases from water cooled disk, wind cooled to PAG cooled disk. The tensile strength decreases while the plasticity increases from water cooled disk, PAG cooled to wind cooled disk. The PAG quench bath, which can reduce the quenching distortion effectively, is suitable for titanium alloys. The PAG quench bath can be widely used in titanium alloys.
Key words: titanium alloy; cooling rate; distortion; microstructure; tensile strength
