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Research Papers: Experimental Work

Two-Bar Thermal Ratcheting for Alloy 617—Part I: Scoping Tests

[+] Author and Article Information
Yanli Wang

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

T.-L. Sham

Oak Ridge National Laboratory,
1 Bethel Valley Road,
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 11, 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), 031008 (Jun 01, 2015) (8 pages) Paper No: PVT-14-1063; doi: 10.1115/1.4028302 History: Received April 10, 2014; Revised August 11, 2014; Online March 25, 2015

A two-bar thermal ratcheting procedure has been implemented to Alloy 617 at very high temperatures. The procedure is based on two bars tested on two coupled servo hydraulic machines to achieve equal displacement and constant total applied load, mimicking the behavior of a pressurized cylinder subjected to through wall thermal transients. The bars were heated and cooled out of phase to generate thermally induced loading superimposed on a constant mean stress. Scoping test results at slow heating and cooling rates are presented for different mean stresses and thermal histories.

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Figures

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Fig. 1

(a) Schematics of two-bar thermal ratcheting condition and (b) the equivalent boundary conditions of the two bars

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Fig. 2

The control logic of two-bar thermal ratcheting experiments

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Fig. 3

Specimen geometry for Alloy 617 specimens used in two-bar thermal ratcheting experiments

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Fig. 4

Temperature versus time profile for one cycle of the two-bar thermal ratcheting experiments

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Fig. 5

Maximum and minimum stresses in the two bars at temperature range of 650 °C–950 °C

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Fig. 6

Maximum and minimum total strains in the two bars at temperature range of 650 °C–950 °C

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Fig. 7

Stress versus mechanical strain for bars 1 and 2 when tested under mean stress of 28.3 MPa (a), (b), 3.4 MPa (c), (d), 49.6 MPa (e), (f), and −28.3 MPa (g), (h) at temperature range of 650 °C–950 °C. The arrows indicate the ratcheting directions.

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Fig. 8

Maximum and minimum stresses in the two bars at temperature range of 800 °C–950 °C

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Fig. 9

Maximum and minimum total strains in the two bars at temperature range 800 °C–950 °C

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Fig. 10

Stress versus mechanical strain for bars 1 and 2 when tested under mean stresses of 29.6 MPa (a), (b), 3.4 MPa (c), (d), −29 MPa (e), (f), and 49 MPa (g), (h) at temperature range of 800 °C–950 °C. The arrows indicate the ratcheting directions.

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