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Research Papers

Biaxial Thermal Creep of Alloy 617 and Alloy 230 for VHTR Applications

[+] Author and Article Information
Kun Mo

Nuclear Engineering Division,
Argonne National Laboratory,
Argonne, IL 60439
e-mail: kunmo@anl.gov

Wei Lv, Kuan-Che Lan, James F. Stubbins

Department of Nuclear, Plasma, and
Radiological Engineering,
University of Illinois at Urbana-Champaign,
104 South Wright Street,
Urbana, IL 61801

Hsiao-Ming Tung

Institute of Nuclear Energy Research,
Atomic Energy Council,
Taoyuan 325, Taiwan

Di Yun

Nuclear Engineering Division,
Argonne National Laboratory,
Argonne, IL 60439;
Department of Nuclear Science and Technology,
Xi'an Jiaotong University,
Xi'an 710049, China

Yinbin Miao

Nuclear Engineering Division,
Argonne National Laboratory,
Argonne, IL 60439;
Department of Nuclear, Plasma, and
Radiological Engineering,
University of Illinois at Urbana-Champaign,
104 South Wright Street,
Urbana, IL 61801

1Corresponding author.

2K. Mo and W. Lv contributed equally to this work.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 8, 2014; final manuscript received March 24, 2016; published online May 18, 2016. Assoc. Editor: Said Ahzi.The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes.

J. Eng. Mater. Technol 138(3), 031015 (May 18, 2016) (8 pages) Paper No: MATS-14-1131; doi: 10.1115/1.4033322 History: Received June 08, 2014; Revised March 24, 2016

In this study, we employed pressurized creep tubes to investigate the biaxial thermal creep behavior of Inconel 617 (alloy 617) and Haynes 230 (alloy 230). Both alloys are considered to be the primary candidate structural materials for very high-temperature reactors (VHTRs) due to their exceptional high-temperature mechanical properties. The current creep experiments were conducted at 900 °C for the effective stress range of 15–35 MPa. For both alloys, complete creep strain development with primary, secondary, and tertiary regimes was observed in all the studied conditions. Tertiary creep was found to be dominant over the entire creep lives of both alloys. With increasing applied creep stress, the fraction of the secondary creep regime decreases. The nucleation, diffusion, and coarsening of creep voids and carbides on grain boundaries were found to be the main reasons for the limited secondary regime and were also found to be the major causes of creep fracture. The creep curves computed using the adjusted creep equation of the form ε=Aσcosh1(1+rt)+Pσntm agree well with the experimental results for both alloys at the temperatures of 850–950 °C.

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Copyright © 2016 by ASME
Topics: Creep , Alloys , Stress
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References

Figures

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Fig. 1

Schematic diagram of the pressurized creep tube

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Fig. 2

Diameter strain versus creep exposure time for alloy 617 at 900 °C

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Fig. 3

Creep strain rate for alloy 617 with an applied stress of (a) 15 MPa, (b) 18 MPa, and (c) 30 MPa at 900 °C

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Fig. 4

Diameter strain versus creep exposure time for alloy 230 at 900 °C

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Fig. 5

Creep strain rate for alloy 230 with an applied stress of (a) 18 MPa, (b) 23 MPa, (c) 30 MPa, and (d) 35 MPa at 900 °C

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Fig. 6

Stress exponent analysis for (a) alloy 617 and (b) alloy 230 at 900 °C

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Fig. 7

Cross-sectional view of pressurized creep tubes near the fracture surface under the applied stress of 18 MPa at 900 °C for alloy 617

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Fig. 8

Cross-sectional view of pressurized creep tubes near the fracture surface under the applied stress of 30 MPa at 900 °C for alloy 230

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Fig. 9

Illustration of the analysis of stress–strain data of alloy 617 at 950 °C

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Fig. 10

Experimental results and analytic description for (a) K(t) and (b) C(t)

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Fig. 11

Comparison of computed creep curves with experimental data for alloy 617 at (a) 850 °C, (b) 900 °C, and (c) 950 °C

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Fig. 12

Comparison of computed creep curves with experimental data for alloy 230 at (a) 850 °C, (b) 900 °C, and (c) 950 °C

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