Influence of Solution Temperature on Microstructure and Mechanical Property of GH4099 Alloy

doi:10.12141/j.issn.1000-565X.210704

Abstract

Abstract:

In order to study the effect of solution temperature on the microstructure and properties of GH4099 alloy ring forgings, a heat treatment test was designed with solution treatment temperature of 1 080, 1 100 and 1 120 ℃, holding time of 1 h and aging treatment system was 900 ℃ and the holding time was 5 h. Then, the microstructure analysis and mechanical properties test were carried out. The effect of solution temperature on the microstructure and properties of GH4099 alloy ring forgings was investigated by SEM, EPMA, JMatPro software and mechanical experiment detection. The results show that, after the solid solution treatment at 1 080, 1 100 and 1 120 ℃, the average size of the γ′phase is 47.3, 48.5 and 49.3 nm, respectively, and the volume fraction is 30.1%, 31.0% and 29.9%, respectively. It can be seen that the solid solution temperature has little effect on the size, content and distribution of γ′phase. With the increase of solution temperature, the hardness of the alloy decreases. The granular M₂₃C₆ carbide in the crystal gradually dissolved with the rise of solid solution temperature. When the temperature reached 1 120 ℃, the M₂₃C₆ in the crystal almost completely dissolved. The fine and uniform grain can be obtained below 1 100 ℃; when the temperature is above 1 100 ℃, the grain size grows obviously, and the M₂₃C₆ carbide precipitate in a chain shape at the grain boundary after aging, which makes the grain boundary change from flat to curved. The curved grain boundary can effectively improve the rupture life of the alloy. The grain structure near the fracture of the durable specimens is elongated, and there are a lot of voids at the grain boundaries, which indicates that intragranular fracture is the main mechanism of crack initiation and propagation in the alloy. In addition, uneven internal texture and mixed crystal phenomenon occur in the alloy when solution treatment temperature is 1 120 ℃. Therefore, the best solution treatment temperature for GH4099 alloy ring forgings is 1 100 ℃.

Key words: GH4099 alloy, solution treatment temperature, microstructure, mechanical property, hardness, rupture life

CLC Number:

TG146

TAN Haibing, LI Shu, WANG Jing, et al. Influence of Solution Temperature on Microstructure and Mechanical Property of GH4099 Alloy[J]. Journal of South China University of Technology(Natural Science Edition), 2022, 50(8): 136-143.

Figures/Tables 10

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元素名称	含量^1）/%	元素名称	含量/%
C	0.040	Al	2.100
W	6.000	Ti	1.250
Co	6.500	Mo	4.000
Cr	18.500	B	0.002
Fe	1.000	Ni	余量

化合物	元素含量/%
化合物	Ni	Co	Cr	Fe	Mo	Ti	W	B	C
MC	—	—	1.25	—	1.46	57.36	24.68	—	15.26
M₂₃C₆	4.12	1.13	69.48	0.08	19.74	—	0.32	—	5.12
M₃B₂	0.02	0.02	20.00	—	71.35	—	0.42	8.16	—

固溶温度/℃	数值类别	持久寿命/h	持久延伸率/%
1 080	测试值	24.70	67
	测试值	26.60	59
	平均值	25.65	63
1 100	测试值	48.20	57
	测试值	45.00	57
	平均值	46.60	57
1 120	测试值	47.30	50
	测试值	46.60	58
	平均值	46.95	54

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