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Research Papers: Materials and Fabrication

Alloy 617 Creep–Fatigue Damage Evaluation Using Specimens With Strain Redistribution

[+] 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,
PO Box 2008, MS-6155,
Oak Ridge, TN 37831
e-mail: shamt@ornl.gov

Robert 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 4, 2014; final manuscript received July 16, 2014; published online October 15, 2014. Assoc. Editor: David L. Rudland.

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 the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes.

J. Pressure Vessel Technol 137(2), 021402 (Oct 15, 2014) (6 pages) Paper No: PVT-14-1057; doi: 10.1115/1.4028054 History: Received April 04, 2014; Revised July 16, 2014

The simplified model test (SMT) method is an alternate approach to determine the cyclic life at elevated temperature. It is based on the use of creep–fatigue hold time test data from test specimens with elastic follow-up conservatively designed to bound the response of general structural components. In this paper, the previously documented development of the SMT approach and applicable restrictions are reviewed; the design of the Alloy 617 SMT specimen, measurement issues and constraints are presented; initial test results and their application to a prototypic design curve are presented; and further testing and analysis for ASME code incorporation are discussed.

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Figures

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Fig. 1

SMT methodology. (a) Shell structure with stress concentration and elastic follow-up, (b) design curve, and (c) hold time creep–fatigue test with elastic follow-up.

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Fig. 2

Elastic follow-up factor q as a function of area and length ratios

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Fig. 3

Dimensions of solid bar specimen (dimensions in mm)

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Fig. 4

Applied end-displacement profile for one cycle

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Fig. 5

Photograph of the failed specimen

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Fig. 6

Strain range history

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Fig. 7

Hysteresis loops for the first three cycles

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Fig. 8

Hysteresis loop for the 100th cycle

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Fig. 9

Maximum and minimum average stress history in neck region

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Fig. 10

Stress relaxation during the hold period for SMT neck region and standard creep–fatigue specimen in Ref. [9]

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Fig. 11

SMT design curve for Alloy 617 at 950 °C (illustrative)

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