Study on Processing Map of Homogenized GH3625 Superalloy and Its Tube Manufacturing by Short-flow Hot Extrusion
DING Yutian1,2, CHEN Jianjun1,2, LI Haifeng3, GAO Yubi1,2, XU Jiayu1,2, MA Yuanjun1,2
1 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050 2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050 3 Changzhou Hengfeng Special Conductor Co., Ltd, Changzhou 213000
Abstract: 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—1 200 ℃ 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 1 150—1 200 ℃ 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 1 150 ℃, 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.
丁雨田, 陈建军, 李海峰, 高钰璧, 许佳玉, 马元俊. 均匀化态GH3625合金热加工图及短流程热挤压管材研究[J]. 材料导报, 2019, 33(16): 2753-2758.
DING Yutian, CHEN Jianjun, LI Haifeng, GAO Yubi, XU Jiayu, MA Yuanjun. Study on Processing Map of Homogenized GH3625 Superalloy and Its Tube Manufacturing by Short-flow Hot Extrusion. Materials Reports, 2019, 33(16): 2753-2758.
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2019, Vol. 33 
