Effect of Solution Temperature on Microstructure and Mechanical Property of High Temperature Alloy GH2787

doi:10.11901/1005.3093.2016.377

Chinese Journal of Materials Research

2017, Vol. 31

Issue (7): 517-525 DOI: 10.11901/1005.3093.2016.377

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Effect of Solution Temperature on Microstructure and Mechanical Property of High Temperature Alloy GH2787

Ling XU^1,²(

), Zhenxing GUO³, Dongmei ZHANG³, Changqing SUN¹, Shuang ZHU¹, Bingda WANG¹, Yuxiu LI¹, Chuanyong CUI²

1 Shenyang Institute of Engineering, Shenyang 110136, China
2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3 Shenyang Liming Aero-Engine Group Corporation, Shenyang 110043, China

Cite this article:

Ling XU, Zhenxing GUO, Dongmei ZHANG, Changqing SUN, Shuang ZHU, Bingda WANG, Yuxiu LI, Chuanyong CUI. Effect of Solution Temperature on Microstructure and Mechanical Property of High Temperature Alloy GH2787. Chinese Journal of Materials Research, 2017, 31(7): 517-525.

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Abstract

Effect of solution treatment temperatures on the microstructure and mechanical property of a high temperature alloy GH2787 was investigated. The results showed that the grain size of the alloy could be controlled by the solution temperature. When the solution temperature was higher than the solve temperature of γ' phase, the grain size was larger and the volume fraction of γ'- phase was low. When the solution temperature was lower than the solve temperature of γ'-phase, the grain size was smaller and the volume fraction of γ'-phase was high, and which was uniformly distributed in the alloy. η-phase precipitated when the solution temperature was around the solve temperature of γ'-phase. The Vickers hardness and the tension strength increased as the solution temperature decreased. The strengthening mechanisms of the alloy GH2787 might be ascribed to grain boundary strengthening and precipitation strengthening.

Key words: metallic materials GH2787 heat-treatment microstructure tension properties

Received: 04 July 2016

ZTFLH:

TG171

Fund: Supported by National Basic Research Program of China (No. 2010CB631206), National Natural Science Foundation of China (Nos. 51171179, 51128101 & 51271174) and the Program of “One Hundred Talented People ” of the Chinese Academy of Sciences

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	Articles by authors
	Ling XU
	Zhenxing GUO
	Dongmei ZHANG
	Changqing SUN
	Shuang ZHU
	Bingda WANG
	Yuxiu LI
	Chuanyong CUI

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.377 OR https://www.cjmr.org/EN/Y2017/V31/I7/517

Fig.1 The phase diagram of GH2787 calculating using Thermo-Calc

Table 1 Composition of GH2787 alloy (mass fraction, %)

Fig.2 OM image showing the microstructure of the alloy after 50% rolling deformation

Fig.3 OM images showing the microstructure of the alloy after rolling deformation (a) rim section, (b) core section

Fig.4 OM images showing the microstructure of the alloy after heat-treatment above γ’ phase solve temperature (a) 980℃, (b) 960℃

Fig.5 SEM image showing the microstructure of the alloy after heat-treatment at 980℃

Fig.6 OM image showing the microstructure of the alloy after heat-treatment around γ’ phase solve temperature (a) 940℃, (b) 920℃

Fig.7 SEM image showing the microstructure of the alloy after heat-treatment at 940℃

Fig.8 SEM image showing the microstructure of the alloy after heat-treatment below γ’ phase solve temperature

Fig.9 SEM image showing the microstructure of the alloy after solution at 900℃

Fig.10 TEM image showing the microstructure of the needle phase (a) bright filed image, (b) dark field image

Fig.11 The diffraction pattern of the needle precipitation phase

Table 2 Composition of the needle phase (mass fraction, %)

Fig.12 Vickers hardness of the test alloys as a function of the temperature

Fig.13 Tension properties of the alloy after heat-treatment at 25℃ (a) and 550℃ (b)

Table 3 Tension properties of the alloy after heat-treatment at various temperatures

Fig.14 The deformation microstructure at 25℃ after 900℃ solution heat-treatment

Fig.15 Deformation microstructure at 25℃ after 940℃ solution heat-treatment

Fig.16 TEM images of deformation microstructure at 25℃ after 980℃ solution heat-treatment

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