Dynamic Recrystallization Behavior and Grain Size Control of GH4706 Superalloy

doi:10.11901/1005.3093.2013.960

Chinese Journal of Materials Research

2014, Vol. 28

Issue (5): 362-370 DOI: 10.11901/1005.3093.2013.960

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Dynamic Recrystallization Behavior and Grain Size Control of GH4706 Superalloy

Shuo HUANG^1,²,Lei WANG^1,^**(

),Beijiang ZHANG²,Wenyun ZHANG²,Guangpu ZHAO²

1. Key Lab for Anisotropy and Texture of Materials, Northeastern University, Shenyang 110819
2. Department of High-temperature Materials, Central Iron and Steel Research Institute, Beijing 100081

Cite this article:

Shuo HUANG,Lei WANG,Beijiang ZHANG,Wenyun ZHANG,Guangpu ZHAO. Dynamic Recrystallization Behavior and Grain Size Control of GH4706 Superalloy. Chinese Journal of Materials Research, 2014, 28(5): 362-370.

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Abstract

The influence of deformation temperature and strain on the microstructure of GH4706 superalloy was studied by means of double-cone samples compression combined with finite element numerical (FEM) simulation. The results show that the dynamic recrystallization (DRX) mechanism of GH4706 superalloy is a discontinuous process associated with a strain induced grain boundaries bulging leading to the formation of nuclei. It is found that the critical temperature (T_DRX) is 975℃, while the critical strain (ε_DRX) of DRX depends on both the solve of η phase and deformation generating heat. When the deformation temperature is slight lower than the T_DRX, η phase will be partially retained in the alloy, which then hinders the migration of sub-grain or grain boundaries. Therefore, finer grain of GH4706 superalloy can be obtained by deforming with a larger strain at a temperature below T_DRX.

Key words: metallic materials GH4706 alloy double cone sample microstructure dynamic recrystallizaiton

Received: 19 December 2013

Fund: *Supported by National High Technology Research and Development Program of China No. SS2012AA030801, National Basic Research Program of China No. 2010CB631203, and Common Technical Research Aircraft Key Component Forming No. 2012ZX04010-081.

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	Shuo HUANG
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	Beijiang ZHANG
	Wenyun ZHANG
	Guangpu ZHAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.960 OR https://www.cjmr.org/EN/Y2014/V28/I5/362

Fig.1 Macrostructure of GH4706 alloy bar (a) and image of the double cone sample (b)

Fig.2 Strain (a) and temperature (b) distribution maps of the double cone sample deformed at 950℃

Fig.3 Macrostructures and true strain distribution map of the zone indicated by the dashed box in Fig. 2a of double cone samples deformed at 950℃ (a) and 1010℃ (b), respectively

Fig.4 Microstructures of the double cone samples with the strain of 0.2 (a, d), 0.6 (b, e), 1.0 (c, f) deformed at 950℃ (a-c) and 1010℃ (d-f)

Fig.5 The effects of deformation temperature and strain on the DRX fraction (a) and DRX grain size (b)

Fig.6 Typical SEM (a, d), EBSD (b, e) and TEM (c, f) images of the microstructures at the critical strain deformed at 950℃ (a-c) and 980℃ (d-f)

Fig.7 The relationship of critical strain of recrystallization and deformation temperature

Fig.8 Typical SEM (a, b) and TEM (c-f) images at the strain of 0.2 (a, c, d) and 1.0 (b, e, f) after deformed at 950℃

Fig.9 Effects of deformation temperature and strain on the content of η phase

Fig.10 Relationship of deformation temperature and DRX grain size at a strain of 1.0

Fig.11 Effects of deformation temperature and strain on the average grain size after standard heat treatment

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