Water quench thermal fatigue analysis of grade p22 and grade p91 steels

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dc.contributor Guo, Yuebin B.
dc.contributor Haque, Anwarul
dc.contributor.advisor Barkey, Mark E.
dc.contributor.author Appling, William
dc.date.accessioned 2017-03-01T17:38:37Z
dc.date.available 2017-03-01T17:38:37Z
dc.date.issued 2015
dc.identifier.other u0015_0000001_0002168
dc.identifier.other Appling_alatus_0004M_12565
dc.identifier.uri https://ir.ua.edu/handle/123456789/2537
dc.description Electronic Thesis or Dissertation
dc.description.abstract Power plants and other facilities that utilize high temperature steam flow have been using corrosion-resistant steels with high creep-rupture strengths in their piping systems. Fatigue crack failures have occurred in these piping systems, potentially from the sudden temperature changes from the internal water spray system used to control steam temperature. A new test to investigate the thermal quench fatigue response of metals was developed to aid the study of these failures in P22 and P91 steel pipes. The focus of this thesis was to develop the test and begin development of the quench fatigue response of P22 and P91. Testing involved evaluating the pre and post-test hardness measurements of the quench fatigue specimens and correlating these results with the results of the quench fatigue runs. Specimens were evaluated in quench fatigue for two test conditions: a maximum stress condition and a stress loading similar to what has been measured in existing piping systems. The maximum stress state was used to induce failure in the specimens within a reasonable amount of time and to evaluate any change in material microstructure. The second test condition had a temperature drop of approximately 200 °C and more closely simulated general operating conditions for the piping systems in question. This test condition also included a preload on the specimen in the axial direction to simulate the stress induced from the internal pressure of the piping systems. In addition to experimental analysis, a finite element model was developed and tested to verify the initial material deformation that occurred from quench spraying.
dc.format.extent 103 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Mechanics
dc.subject.other Materials Science
dc.subject.other Mechanical engineering
dc.title Water quench thermal fatigue analysis of grade p22 and grade p91 steels
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Dept. of Aerospace Engineering and Mechanics
etdms.degree.discipline Aerospace Engineering
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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