FGH4096合金含高应变速率的流变行为和热加工图构建

doi:10.11896/cldb.19070069

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Abstract The hot flow behavior and processing maps of hot isostatic pressed powder metallurgy FGH4096 superalloy were studied at the temperature range of 1 020—1 140 ℃ and strain rate range of 0.001—10 s^-1. The flow stress decrease after the rapid peak strain points and then smoothly transfer to the steady state during the strain rates of 0.001—1.0 s^-1. As for the strain rate of 10 s^-1, it demonstrates no steady state and the curves drop down sharply, which corresponds with the cracks of specimens. It is found that the flow stresses increase with decreasing deformation temperature and increasing strain rate. Especially when strain rate is above 1.0 s^-1, there are double summits of the flow stresses which are resulted in the slip system and dislocation transition at high stain rates. The processing maps with true strain 0.3 exhibit two peak positions of energy dissipation rate: (1) 1 040 ℃, 0.002 s^-1, with an efficiency of 62%; (2)1 120 ℃, 0.001 s^-1, with an efficiency of 53%. Plasti-city instability is anticipated while the strain rate is above 0.2 s^-1 and the temperature range is 1 050—1 105 ℃ at true strain 0.4.

Key words： FGH4096 superalloy high strain rate thermal compression constitutive model processing map

Published: 06 November 2020

CLC number:

V256

Fund:Research Foundation of Education Bureau of Hunan Province, China (16A220), Natural Science Foundation of Hunan Province(2017JJ2403), Support Program for Scientific and Technological Innovation Team of the Higher Education Institutions of Hunan Province, China(2014207),Graduate Innovation Foundation of Central South University of Forestry and Technology(CX20192078).

About author:: Songhao Liuis a postgraduate studying in Central South University of Forestry & Technology. He participates in the development of forming process, structure and properties of advanced superalloy.
Jiayong Si received his Ph.D. degree in material scie-nce and engineering from Central Iron and Steel Research Institute in 2009. He is currently an associate professor in Central South University of Forestry & Technology and participates in the development of for-ming process, structure and properties of advanced superalloy. His research interests are the stress and strain, numerical simulation, microstructure and mechanical properties of powder superalloy with the application in advanced aero-engine.

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	LIU Songhao
	SI Jiayong
	CHEN Long
	XU Mengjie

Cite this article:

LIU Songhao,SI Jiayong,CHEN Long, et al. Flow Behavior and Processing Maps of FGH4096 Alloy Including High Strain Rate[J]. Materials Reports, 2020, 34(20): 20123-20129.

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http://www.mater-rep.com/EN/10.11896/cldb.19070069 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20123

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