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Research Papers: Materials and Fabrication

Thermal Shock Testing and Analysis of IN617 and Super 304H Samples

[+] Author and Article Information
J. P. Shingledecker

 Oak Ridge National Laboratory, Oak Ridge, TN 37831-6155shingledecjp@ornl.gov

R. L. Battiste

 Oak Ridge National Laboratory, Oak Ridge, TN 37831-6091battisterl@ornl.gov

P. Carter

 Alstom Power Inc., Windsor, CT 06095peter.carter@power.alstom.com

J. Pressure Vessel Technol 131(3), 031410 (May 04, 2009) (8 pages) doi:10.1115/1.3120265 History: Received July 31, 2007; Revised November 19, 2008; Published May 04, 2009

The DOE/OCDO sponsored Ultrasupercritical Steam Boiler Consortium is conducting thermal shock tests on austenitic and nickel-based materials to assess their use in thick-section boiler components. This paper describes the tests on CCA617 (a controlled chemistry version of IN617) and Super 304H thick-walled tubes. Details are given of the metallurgical analyses of the observed cracking in the bore and on the outside diameter of the samples, and of the thermal-mechanical analyses to explain the results. Elastic-plastic and elastic-plastic-creep analyses are used to calculate damage based on rupture life and creep strain accumulation. The results of the metallurgical and mechanical analyses are compared, and conclusions are drawn as to the accuracy and effectiveness of available high temperature life prediction techniques. The test conditions bear no relation to expected operating conditions. They are chosen to generate failure data.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Thermal shock specimen and test setup

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Figure 2

Single cycle temperature profile and typical measured temperatures for the CCA617 test. Note that the ID thermocouple did not read the correct temperature due to preferential cooling.

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Figure 3

Single cycle temperature profile and typical measured temperatures for the Super 304H test using center ID and OD thermocouples

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Figure 4

Single cycle temperature profile and typical measured temperatures for the Super 304H test showing axial OD temperature gradients (0.75 in. spacing)

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Figure 5

Macro image of the dye-penetrant inspection of CCA617 after 3414 cycles showing randomly oriented cracking

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Figure 6

OD intergranular cracking (creep damage) in the CCA617 thermal shock specimen after 5414 cycles; arrows indicate surface and subsurface cracks

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Figure 7

ID transgranular cracking (fatigue damage) in the CCA617 specimen after 5414 cycles

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Figure 8

OD intergranular cracking (creep damage) in Super 304H after 10,000 cycles

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Figure 9

Comparison of CCA617 and conventional IN617 creep rupture behavior

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Figure 10

Comparison of Super 304H and conventional SS304H creep rupture behavior

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Figure 11

Creep models for Super 304H and CCA 617 at respective critical temperatures

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Figure 12

(a) Cyclic response of CCA617 to 0.3% strain range at 750°C (shakedown). (b) Cyclic response of CCA617 to 0.4% strain range at 750°C (slight hysteresis). (c) Cyclic response of CCA617 to 0.7% strain range at 750°C (360 s hold).

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Figure 13

Cyclic stress-strain model for CCA617

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Figure 14

Cyclic stress-strain models for the 304H material (strain range for test indicated)

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Figure 15

Initial and cyclic response of 304H at sample OD

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Figure 16

Elastic-plastic-creep cyclic response on specimen OD

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Figure 17

Temperature and elastic-plastic maximum principal stress histories for the CCA617 specimen

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Figure 18

Elastic-plastic and creep von Mises stress histories for the CCA617 specimen

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Figure 19

Temperature and elastic-plastic maximum principal stress histories: Super 304H

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Figure 20

Elastic-plastic and creep von Mises stress histories: Super 304H

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Figure 21

Calculated creep and fatigue damage for the CCA617 test

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Figure 22

Calculated creep and fatigue damage for the Super 304H test with 9000 cycles

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