Effect of Heat Treatment on Microstructure and Tensile Properties of a Typical γʹ-strengthened Co-based Superalloy

doi:10.11901/1005.3093.2024.198

Chinese Journal of Materials Research

2025, Vol. 39

Issue (3): 198-206 DOI: 10.11901/1005.3093.2024.198

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Effect of Heat Treatment on Microstructure and Tensile Properties of a Typical γʹ-strengthened Co-based Superalloy

ZHANG Huifang¹^,², WU Hao¹, XIAO Chuanmin³, LI Qi¹, XIE Jun¹(

), LI Jinguo¹, WANG Zhenjiang¹, YU Jinjiang¹

^1.Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
^2.School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
^3.Third Military Representative Room in Shenyang Area Air Force Equipment, Shenyang 110016, China

Cite this article:

ZHANG Huifang, WU Hao, XIAO Chuanmin, LI Qi, XIE Jun, LI Jinguo, WANG Zhenjiang, YU Jinjiang. Effect of Heat Treatment on Microstructure and Tensile Properties of a Typical γʹ-strengthened Co-based Superalloy. Chinese Journal of Materials Research, 2025, 39(3): 198-206.

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Abstract

A typical γʹ-strengthened Co-based superalloy was focused on in this research, and various characterization methods were employed to investigate the microstructure of the as-cast alloy. Subsequently, a heat treatment regime was developed based on the characteristics of the as-cast microstructure, and the effect of heat treatment on the microstructure and room temperature/high-temperature tensile properties of the alloy was assessed. The results showed that: the microstructure of the as-cast alloy consisted of γ matrix, γʹ phases, MC carbides, γ/γʹ eutectic and M₃B₂ borides. After solution and aging heat treatments, the γ/γʹ eutectic disappeared, and the M₃B₂ borides were mostly dissolved, with uniformly sized γ′ phases precipitating in the matrix. In comparison to the as-cast alloy, the room temperature tensile strength of the heat-treated alloy decreased, but plasticity slightly improved. Tensile tensile at 950 °C showed that the strength and plasticity of the heat-treated alloy were improved to some extent. Both the as-cast and heat-treated alloys exhibited a characteristic of cleavage fracture during room temperature tensile testing, while the fracture mechanism under high-temperature tensile conditions was a ductile fracture of the micropore aggregation type.

Key words: metallic materials Co-based superalloy microstructure characteristics heat treatment tensile properties

Received: 08 May 2024

ZTFLH:

TG132.32

Fund: National Key Research and Development Program of China(2023YFB3712003);National Science and Technology Major Project(J2019-VI-0018-0133);AECC Independent Innovation Special Fund Project(ZZCX-2022-040);Youth Innovation Promotion Association Project, Chinese Academy of Sciences(2020198)

Corresponding Authors: XIE Jun, Tel: (024)23978341, E-mail: junxie@imr.ac.cn

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	ZHANG Huifang
	WU Hao
	XIAO Chuanmin
	LI Qi
	XIE Jun
	LI Jinguo
	WANG Zhenjiang
	YU Jinjiang

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.198 OR https://www.cjmr.org/EN/Y2025/V39/I3/198

Fig.1 Schematic diagram of tensile specimen (unit: mm)

Fig.2 OM micrographs of as-cast alloy (a) low magnification, (b) high magnification

Table 1 EPMA analysis of the precipitated phase in as-cast alloy

Fig.3 Phase identification of as-cast microstructure with EBSD (a) SEM image, (b) M₃B₂ phase identification, (c-d) M₃B₂ EDS mapping

Fig.4 SEM images of γʹ precipitates in as-cast alloy (a) dendritic core area, (b) interdendritic area

Fig.5 DSC heating curves of as-cast alloy

Fig.6 SEM images of incipient melting at different temperatures (a) 1235 ^oC, (b) 1205 ^oC, (c) 1175 ^oC, (d) 1155 ^oC, (e) 1145 ^oC, (f) 1135 ^oC

Fig.7 SEM micrographs of as-cast alloy (a), the heat-treated microstructure after solutioned at 1120 ^oC for 3 h (b) and the heat-treated microstructure after solutioned at 1120 ^oC for 6 h (c)

Fig.8 Heat treatment process of alloy

Fig.9 Microstructure of heat-treatment alloy (a) low magnification SEM image, (b) high magnification SEM image, (c) γʹ precipitates

Table 2 Tensile properties of as-cast and heat-treatment alloys at different temperatures

Fig.10 Tensile fracture surface morphologies of as-cast alloy at different temperatures (a) low magnification micromorphology at RT, (b) high magnification micromorphology at RT, (c) low magnification micromorphology at 950 ^oC, (d) high magnification micromorphology at 950 ^oC

Fig.11 Tensile fracture surface morphologies of heat-treatment alloy at different temperatures (a) low magnification micromorphology at RT, (b) high magnification micromorphology at RT, (c) low magnification micromorphology at 950 ^oC, (d) high magnification micromorphology at 950 ^oC

Fig.12 Microstructure of the longitudinal section near the fracture after tensile rupture to fracture of as-cast alloy at different temperatures (a~c) RT, (d~f) 950 ^oC

Fig.13 Microstructure of the longitudinal section near the fracture after tensile rupture to fracture of heat-treatment alloy at different temperatures (a~c) RT, (d~f) 950 ^oC

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