均匀化态GH3625合金热加工图及短流程热挤压管材研究

doi:10.11896/cldb.18080005

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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.

Key words： GH3625 superalloy thermal compression dynamic recrystallization (DRX) processing map work-hardening short-flow hot extrusion

Published: 12 July 2019

CLC number:

TG379

Fund:This work was financially supported by the National Natural Science Foundation of China (51661019) and Science and Technology of Gansu Province(145RTSA004).

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	Articles by authors
	DING Yutian
	CHEN Jianjun
	LI Haifeng
	GAO Yubi
	XU Jiayu
	MA Yuanjun

Cite this article:

DING Yutian,CHEN Jianjun,LI Haifeng, et al. Study on Processing Map of Homogenized GH3625 Superalloy and Its Tube Manufacturing by Short-flow Hot Extrusion[J]. Materials Reports, 2019, 33(16): 2753-2758.

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http://www.mater-rep.com/EN/10.11896/cldb.18080005 OR http://www.mater-rep.com/EN/Y2019/V33/I16/2753

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