Effect of Long-term Aging on Properties of Low Expansion Superalloy GH2909

doi:10.11901/1005.3093.2020.314

Chinese Journal of Materials Research

2021, Vol. 35

Issue (5): 330-338 DOI: 10.11901/1005.3093.2020.314

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Effect of Long-term Aging on Properties of Low Expansion Superalloy GH2909

XU Xiong¹^,², LI Zhao², WAN Zhipeng², WEI Kang², WANG Tao²(

), ZHANG Xinfang¹(

)

^1.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
^2.Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

Cite this article:

XU Xiong, LI Zhao, WAN Zhipeng, WEI Kang, WANG Tao, ZHANG Xinfang. Effect of Long-term Aging on Properties of Low Expansion Superalloy GH2909. Chinese Journal of Materials Research, 2021, 35(5): 330-338.

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Abstract

The microstructure and mechanical properties of a new type of low expansion superalloy GH2909 after long time exposure up to 2000 h at 550℃, 600℃ and 650℃ respectively were investigated. The results show that the alloy had a good microstructure stability and high mechanical properties, namely a slightly increase in strength and little change in plasticity, after aging at 550℃ and 600℃ for 2000 h. However, after 2000 h aging at 650℃ the mechanical properties of the alloy dropped significantly: the strength at room temperature and high temperature decreased significantly, and the plasticity decreased at room temperature, especially the reduction of area at room temperature decreased sharply, but the plasticity increased significantly at high temperature. This is mainly due to the precipitation of a large number of needle-like ε/ε″ phases that penetrate the grains and have "Widmanstatten structure"-like morphology in the microstructure of the alloy during the long-term aging process at 650℃, resulting in a significant reduction in the quantity of strengthening phase γ′ phases. At the same time, the stability of γ′ phase decreases at 650℃ and the size of γ′ phase increases significantly.

Key words: metallic materials GH2909 superalloy microstructure long-time aging mechanical properties

Received: 27 July 2020

ZTFLH:

TG113

Fund: Key Laboratory Fund Project(6142903190205);National Natural Science Foundation of China(U1860206);Fundamental Scientific Research Business Expenses of Central Universities(FRF-TP-20-02B)

About author: WANG Tao, Tel: 18810885120, E-mail: wangtao8206@163.com
ZHANG Xinfang, Tel: 17310069802, E-mail: xfzhang@ustb.edu.cn

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	Xiong XU
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https://www.cjmr.org/EN/10.11901/1005.3093.2020.314 OR https://www.cjmr.org/EN/Y2021/V35/I5/330

Table 1 Chemical composition (mass fraction/%) of the alloy

Fig.1 Schematic diagram of heat treatment steps of GH2909 alloy

Fig.2 Tensile properties of GH2909 alloy after aging at room temperature for 2000 h at different temperatures, σ_b is the tensile strength at room temperature, σ_0.2 is the yield strength, δ is the elongation and ψ is the reduction of area

Fig.3 Tensile properties of GH2909 alloy after aging at thigh temperature (540℃) for 2000 h at different temperature, σ_b is the tensile strength at 540℃, σ_0.2 is the yield strength, δ is the elongation and ψ is the reduction of area

Fig.4 Microstructure of GH2909 alloy after aging at different temperature for 2000 h (a) standard heat treatment, (b) 550℃, (c) 600℃, (d) 650℃

Fig.5 Morphology of“black crystal”after aging of GH2909 alloy at different temperature (a) standard heat treatment；(b) 550℃；(c) 600℃；(d) 650℃

Fig.6 Change of ε/ε″ phase after aging at different temperature for 2000 h (a) standard heat treatment; (b) 550℃; (c) 600℃; (d) 650℃

Fig.7 Change of γ′ phase of GH2909 alloy after aging for 2000 h at different temperature (a) standard heat treatment; (b) 550℃; (c) 600℃; (d) 650℃

Fig.8 Microstructure of black crystal

Fig.9 Fractography of GH2909 alloy at room temperature after aging for 2000 h at different temperatures (a), (b), (c) standard heat treatment；(d), (e), (f) 650℃

Fig.10 SEM morphology longitudinal section at room temperature after long-term aging at 650℃ for 2000 h

Fig.11 The γ′ phase“depleted area”around the ε/ε″ phase

Fig.12 Fractography of GH2909 alloy at 540℃ after aging for 2000 h at different temperatures (a), (b), (c) standard heat treatment； (d), (e), (f) 650℃

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