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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

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. 9

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

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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. 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. 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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