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Research Papers: Materials and Fabrication

Research on the High-Temperature Hot Compressive Deformation Behavior of Ni-Based Superalloy GH3128

[+] Author and Article Information
Xi Zhao

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of
Advanced Nuclear Energy Technology,
Key Laboratory of Advanced Reactor Engineering
and Safety of Ministry of Education,
Tsinghua University,
Room A201, Energy Science Building,
Beijing 100084, China
e-mail: zhaoxithu@163.com

Kun Yuan

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of
Advanced Nuclear Energy Technology,
Key Laboratory of Advanced Reactor Engineering
and Safety of Ministry of Education,
Tsinghua University,
Room C103, Energy Science Building,
Beijing 100084, China
e-mail: kyuan@tsinghua.edu.cn

Yu Zhou

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of
Advanced Nuclear Energy Technology,
Key Laboratory of Advanced Reactor Engineering
and Safety of Ministry of Education,
Tsinghua University,
Room 1210, Huaye Building,
Beijing 100084, China
e-mail: yuzhou@tsinghua.edu.cn

Fu Li

Institute of Nuclear and New Energy Technology,
Collaborative Innovation Center of
Advanced Nuclear Energy Technology,
Key Laboratory of Advanced Reactor Engineering
and Safety of Ministry of Education,
Tsinghua University,
Energy Science Building,
Beijing 100084, China
e-mail: lifu@tsinghua.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 23, 2016; final manuscript received July 3, 2016; published online September 27, 2016. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 139(2), 021401 (Sep 27, 2016) (8 pages) Paper No: PVT-16-1027; doi: 10.1115/1.4034147 History: Received February 23, 2016; Revised July 03, 2016

Intermediate heat exchanger (IHX), which transfers the heat generated in the reactor core to the secondary loop, is one of the key structural components of the very high-temperature gas-cooled reactor (VHTR). The Ni-based superalloy GH3128 has good high-temperature strength and so is a promising main structural material for the IHX. In this paper, the flow stress behaviors and the deformation microstructure of superalloy GH3128 were investigated by high-temperature compression tests conducted at various temperatures (950–1150 °C) and strain rates (0.001–10 s−1), and the processing maps were analyzed in order to establish the hot deformation constitutive model and obtain the optimum hot forming condition. The results show that (1) both flow stresses and peak flow stresses increase along with the increase of strain rate or decrease of temperature, (2) GH3128 has excellent hot workability, (3) the dynamic recovery (DRV) plays the dominant role during the dynamic softening process due to the high stack fault energy, and (4) the optimum hot forming condition of GH3128 should be defined in the temperature of 1150 °C and strain rate range of 0.01–0.056 s−1. This work contributes to the application of GH3128 alloy on IHX structure.

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References

Figures

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Fig. 1

Optical microstructure of GH3128 bar before hot deformation: (a) 50× and (b) 200×

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Fig. 2

True stress–strain curves of alloy GH3128 under hot compression at various temperatures and strain rates: (a) ε˙=0.001 s−1, (b)  ε˙=0.01 s−1, (c)  ε˙=0.1 s−1, (d)  ε˙=1 s−1, and (e)  ε˙=10 s−1

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Fig. 3

Effect of temperature (a) 950 °C, (b) 1000 °C, (c) 1050 °C, (d) 1100 °C, and (e) 1150 °C on microstructures of GH3128 deformed at strain rate of 0.01 s−1 (500×)

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Fig. 4

Effect of strain rate (a) 0.001 s−1, (b) 0.01 s−1, (c) 0.1 s−1, (d) 1 s−1, and (e) 10 s−1 on microstructures of GH3128 deformed under temperature of 1100 °C (500×)

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Fig. 5

Relationships between different deformation parameters of GH3128

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Fig. 6

Cubic spline fit of log σ – log ε˙ at different strains: (a) 0.2, (b) 0.4, and (c) 0.6

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Fig. 7

Power dissipation maps of GH3128 at different strains: (a) 0.2, (b) 0.4, and (c) 0.6

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Fig. 8

Processing maps of GH3128 at different strains: (a) 0.2, (b) 0.4, and (c) 0.6

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