摘要
在Gleeble-3800热模拟机上对均匀化态GH3625合金进行等温热压缩实验,研究了该合金在变形温度为800~1200℃、应变速率为0.01~10 s~(-1)条件下的热变形行为。利用动态材料模型建立了均匀化态GH3625合金的热加工图,然后基于热加工图在卧式挤压机上对均匀化态GH3625合金进行短流程热挤压管材试验,并验证了其可行性。研究表明,GH3625合金在热压缩变形过程中,加工硬化和动态再结晶软化共同发挥作用,使得真应力-真应变曲线呈典型的动态再结晶特征。加工图中的安全区为变形温度1150~1200℃、应变速率0.01~0.1 s~(-1),该区域的最大峰值效率为0.48。空心管坯在挤压温度为1150℃、挤压速度为50 mm/s和挤压比为7.4的条件下,成功挤压出规格为Φ43 mm×9.5 mm的GH3625合金荒管,其组织及力学性能接近于传统热挤压工艺制备的管材。
The isothermal compression experiments of homogenized GH3625 superalloy were carried out on a Gleeble-3800 thermal simulator, aiming at studying the hot deformation behavior of the alloy in the temperature range of 800—1200 ℃ and strain rate range of 0.01—10 s~(-1). The processing map of this alloy was established on the basis of dynamic material model, then the GH3625 superalloy seamless tube was manufactured by short-flow hot extrusion on a horizontal extruder according to the processing map, and its feasibility was verified. The results showed that the work-hardening and softening caused by dynamic recrystallization of GH3625 acted together in the process of thermal compression, which made the true stress-strain curves exhibited typical dynamic recrystallization characteristics. The safe region with maximum peak efficiency was 0.48, which could be observed in the processing map in the temperature range of 1150—1200 ℃ and strain rate range of 0.01—0.1 s~(-1). The GH3625 superalloy tube with size of Φ43 mm×9.5 mm had been successfully extruded from the hollow tube under the preheating temperature of 1150 ℃, fixed extrusion speed of 50 mm/s, and extrusion ratio of 7.4. The GH3625 tubes manufactured by short-flow hot extrusion presented similar microstructure and mechanical properties to the one prepared by traditional hot extrusion process.
引文
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