Effect of Solution Temperature on Mechanical Properties and γ' Phase of GH4742 Superalloy

doi:10.11901/1005.3093.2022.182

Chinese Journal of Materials Research

2023, Vol. 37

Issue (7): 502-510 DOI: 10.11901/1005.3093.2022.182

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Effect of Solution Temperature on Mechanical Properties and γ' Phase of GH4742 Superalloy

QIN Heyong¹^,², LI Zhentuan¹^,²(

), ZHAO Guangpu¹^,², ZHANG Wenyun¹^,², ZHANG Xiaomin¹^,²

^1.High-Temperature Materials Institute, Central Iron and Steel Research Institute, Beijing 100081, China
^2.CISRI-GAONA Co., Ltd., Beijing 100081, China

Cite this article:

QIN Heyong, LI Zhentuan, ZHAO Guangpu, ZHANG Wenyun, ZHANG Xiaomin. Effect of Solution Temperature on Mechanical Properties and γ' Phase of GH4742 Superalloy. Chinese Journal of Materials Research, 2023, 37(7): 502-510.

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Abstract

The effect of different solution temperatures on the micro-substructure and γ' phase of GH4742 superalloy were studied by EBSD and TEM, and the mechanical properties of GH4742 superalloy were measured. The results show that the proportion of static recrystallization of matrix increased with increasing solution temperature in the range of 1080℃ to 1120℃, which resulted in the decrease of the proportion of low-angle grain boundaries from 13.2% to 3.2%; Meanwhile, the grains were significantly coarsened with a size increase from 11.0 μm to 111.6 μm, the proportion of Σ3 twin boundary increased from 13.2% to 58.6%. The volume fraction of the primary γ' phase in the matrix decreased evidently with the increase of the solution temperature, while the size of the primary γ' phase increased, and the volume fraction and size of the secondary γ' phase increased continuously, and that of the tertiary γ' phase changed little. The variety of strengthening contribution of γ' phase was small by different solution temperatures, and the strengthening increment caused by grain boundary strengthening plays determine role in the strength of the matrix. The room temperature strength of GH4742 alloy decreased dramatically with the increase of solution temperature, while the high temperature strength and rupture fracture time increased markedly. The GH4742 alloy solution treated at 1100℃ exhibits good mechanical properties at either room temperature or high temperature.

Key words: metallic materials GH4742 superalloy solution temperature micro-substructure mechanical properties

Received: 06 April 2022

ZTFLH:

TG146.1

Fund: National Science and Technology Major Project(2017-VI-0018-0090)

Corresponding Authors: LI Zhentuan, Tel: 18813051277, E-mail: lizhentuan@163.com

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	QIN Heyong
	LI Zhentuan
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	ZHANG Xiaomin

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https://www.cjmr.org/EN/10.11901/1005.3093.2022.182 OR https://www.cjmr.org/EN/Y2023/V37/I7/502

Table 1 Chemical composition of GH4742 superalloy (mass fraction, %)

Fig.1 Stress-strain curves of GH4742 superalloy under different solution temperature (a) Room temperature; (b) 650℃

Fig.2 Effect of solution temperature on rupture properties of GH4742 superalloy (a) creep rupture time; (b) plasticity index

Fig.3 EBSD grain boundary distribution map of the sample under different process (a) forged; (b) 1080℃+780℃; (c) 1100℃+780℃; (d) 1120℃+780℃

Table 2 Proportion of EBSD grain boundary and grain size under different process

Fig.4 Morphology of γ' phase in GH4742 alloy under different process conditions (a) forged; (b) 1080℃+780℃; (c) 1100℃+780℃; (d) 1120℃+780℃

Fig.5 Effects of different solution temperatures on volume fraction and size distribution of γ' phase in GH4742 superalloy (a) Volume fraction of γ' phase; (b) Size distribution of γ' phase

Fig.6 Dislocation configuration in the matrix under different solution temperatures (a) dislocation wall, 1080℃; (b) dislocation nets, 1080℃; (c) dislocation wall, 1100℃; (d) dislocation nets, 1100℃

Fig.7 Schematic diagram of interaction between dislocation and γ' particles under different strengthening mechanisms (a) weak pair-coupling strengthening; (b) strong pair-coupling strengthening; (c) Orowan bypassing strengthening

Fig.8 Effect of anti-phase boundary energy and volume fraction on γ' phase critical radius of different strengthening mechanisms (a) Critical transformation radius of strong-weak coupling; (b) Critical transformation radius of shearing-bypassing

	Strengthening mechanism	1080 ℃			1100 ℃			1120 ℃
	Strengthening mechanism	r / nm	f / %	$Δ σ$ / MPa	r / nm	f / %	$Δ σ$ / MPa	r / nm	f / %	$Δ σ$ / MPa
γ'_Ⅰ	Orowan bypasing	415.4	6.9	54.0	864.5	2.7	15.0	-	-	-
γ'_Ⅱ	Strong-coupling	93.0	10.6	218.0	106.2	15.9	251.1	152.9	18.0	224.0
γ'_Ⅲ	Strong-coupling	15.8	19.5	347.8	15.9	18.4	345.9	15.9	19.0	348.3
$Δ σ T$				572			598			572

Table 3 Size, volume fraction and strengthening increment of γ' phase under different process conditions

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