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Research Papers: Experimental Work

Two-Bar Thermal Ratcheting for Alloy 617—Part II: Ratcheting Results

[+] Author and Article Information
Yanli Wang

Oak Ridge National Laboratory,
1 Bethel Valley Road,
P.O. Box 2008, MS-6083,
Oak Ridge, TN 37831
e-mail: wangy3@ornl.gov

T.-L. Sham

Oak Ridge National Laboratory,
1 Bethel Valley Road,
P.O. Box 2008, MS-6155,
Oak Ridge, TN 37831
e-mail: shamt@ornl.gov

R. I. Jetter

RI Jetter Consulting,
1106 Wildcat Canyon Road,
Pebble Beach, CA 93953
e-mail: bjetter@sbcglobal.net

1Corresponding author

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 10, 2014; final manuscript received August 29, 2014; published online March 25, 2015. Assoc. Editor: Reza Adibi-Asl.

This manuscript has been coauthored by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains, and by accepting the article for publication, the publisher acknowledges that the United States Government retains, a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this work, or allow others to do so, for United States Government purposes.

J. Pressure Vessel Technol 137(3), 031009 (Jun 01, 2015) (6 pages) Paper No: PVT-14-1064; doi: 10.1115/1.4028476 History: Received April 10, 2014; Revised August 29, 2014; Online March 25, 2015

This is Part II of a study on two-bar thermal ratcheting for Alloy 617. The ratcheting strains were evaluated for conditions with the same temperature range but with different mean stresses, heating and cooling rates, time delays, and thermal histories. These testing conditions were designed to be closely aligned to the development of design rules for strain limits at very high temperatures for Alloy 617. These new design rules have been formulated to address the fact that the effects of plastic deformation and creep deformation on the ratcheting strains are not separable at very high temperatures for this alloy.

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References

Wang, Y., Sham, T.-L., and Jetter, R. I., 2014, “Two-Bar Thermal Ratcheting for Alloy 617 Part I: Scoping Tests,” ASME J. Pressure Vessel Technol. (in press). [CrossRef]
ASME, 2013, ASME Boiler and Pressure Vessel Code, III, Rules for Construction of Nuclear Facility Components, Division 1, Subsection NH, Class 1, Components in Elevated Temperature Service — 2013 ed., American Society of Mechanical Engineers, New York.
Carter, P., Jetter, R., and Sham, T.-L., 2012, “Application of Elastic-Perfectly Plastic Cyclic Analysis to Assessment of Creep Strain,” ASME Paper No. PVP2012-78082. [CrossRef]
Carter, P., Jetter, R., and Sham, T.-L., 2012, “Application of Shakedown Analysis to Evaluation of Creep-Fatigue Limits,” ASME Paper No. PVP2012-78083. [CrossRef]
Sartory, W., Young, H., Battiste, R., and Smith, J., 1977, “Thermal Ratcheting Test of 2¼Cr-1Mo Steel to Type 316 Stainless Steel Pipe: Test TTT-3,” Oak Ridge National Laboratory, Oak Ridge, TN, Technical Report No. ORNL/5330.
Zheng, X., Xuang, F., and Zhao, P., 2011, “Ratcheting-Creep Interaction of Advanced 9–12% Chromium Ferrite Steel With Anelastic Effect,” Int. J. Fatigue, 33(9), pp. 1286–1291. [CrossRef]
Ando, M., Isobe, N., Kikuchi, K., and Enuma, Y., 2012, “Effect of Ratchet Strain on Fatigue and Creep–Fatigue Strength of Mod.9Cr–1Mo Steel,” Nucl. Eng. Des., 247, pp. 66–75. [CrossRef]
Kawashima, K., Ishikawa, A., and Asada, Y., 1999, “Ratcheting Deformation of Advanced 316 Steel Under Creep–Plasticity Condition,” Nucl. Eng. Des., 193(3), pp. 327–336. [CrossRef]
Carroll, M. C., and Carroll, L. J., 2013, “Developing Dislocation Subgrain Structures and Cyclic Softening During High-Temperature Creep–Fatigue of a Nickel Alloy,” Metall. Mater. Trans. A, 44(8), pp. 3592–3607. [CrossRef]
Carroll, L. J., Cabet, C., Carroll, M. C., and Wright, R. N., 2013, “The Development of Microstructural Damage During High Temperature Creep–Fatigue of a Nickel Alloy,” Int. J. Fatigue, 47, pp. 115–125. [CrossRef]
Wang, Y., Sham, T.-L., and Jetter, R. I., 2014, “Alloy 617 Creep-Fatigue Damage Evaluation Using Specimens With Strain Redistribution,” ASME J. Pressure Vessel Technol. (in press). [CrossRef]
Swindeman, R., Robinson, D., Williams, B., and Thomas, D., 1982, “Two-Bar Thermal Ratcheting Experiments on 2¼Cr-1Mo Steel,” Oak Ridge National Laboratory, Oak Ridge, TN, Technical Report No. ORNL/TM-8001.
Corum, J. M., and Blass, J. J., 1991, “Rules for Design of Alloy 617 Nuclear Components to Very High Temperatures,” Fatigue, Fracture, and Risk-1991, ASME PVP Vol. 215, American Society of Mechanical Engineers, New York, pp. 147–153.
Carroll, L. J., Cabet, C., and Wright, R. N., 2010, “The Role of Environment on High Temperature Creep-Fatigue Behavior of Alloy 617,” ASME Paper No. PVP2010-26126. [CrossRef]

Figures

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Fig. 1

Specimen geometry of Alloy 617 used in two-bar thermal ratcheting experiments. Units are in mm.

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Fig. 2

Temperature versus time profile for one cycle of two-bar thermal ratcheting experiments on Alloy 617 with delayed cooling (a) and delayed heating (b)

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Fig. 3

Temperature (a), stress (b), total strain (c), and mechanical strain (d) versus time profiles for the first two cycles of test number T16

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Fig. 4

Maximum and minimum total strains for test number T16

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Fig. 5

Maximum and minimum stresses for test number T16

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Fig. 6

Effect of cooling time delay on the maximum and minimum total strains and stresses at mean stress of 8.1 MPa

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Fig. 7

Effect of applied mean stresses on the maximum and minimum total strains and stresses at cooling time delay of 10 min

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Fig. 8

Effect of applied mean stresses on ratcheting strains at cooling time delay of 10 min

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Fig. 9

Effect of delayed cooling, delayed heating, and heating/cooling rates

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