{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23547"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23547","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Crack growth behavior and failure micromechanisms in three heat-resistant materials at elevated temperature","abstract":"Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:05:13Z Item is restricted indefinitely.","abstract_html":"Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:05:13Z Item is restricted indefinitely.","abstract_has_math":false,"creators":["Hour, Kai-Youarn"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Engineering, Nuclear","degree_department":null,"school":null,"contributors":["Stubbins, James F."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:18:14Z","date_published":"2011-05-07T14:18:14Z","updated_at":"2026-07-22T22:25:22Z","subjects":["Engineering, Nuclear"],"languages":["eng"],"rights":["Copyright 1989 Hour, Kai-Youarn"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9010892","(UMI)AAI9010892"],"render_values":[{"text":"AAI9010892","href":null,"code":true},{"text":"(UMI)AAI9010892","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23547","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Stubbins, James F."]},{"key":"dc:creator","label":"Author","values":["Hour, Kai-Youarn"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T14:18:14Z","10000-01-01","1989"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Engineering, Nuclear"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Engineering, Nuclear"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1989 Hour, Kai-Youarn"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9010892","(UMI)AAI9010892","http://hdl.handle.net/2142/23547"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:05:13Z Item is restricted indefinitely.","Crack growth behavior for three heat resistant materials, namely, Alloy 800H, type 310 Stainless Steel, and Hastelloy X has been investigated under creep, fatigue, and fatigue with hold test conditions at the temperature range from 650 to 900$\\sp\\circ$C. The loading-unloading (fatigue) and hold (creep) in a hold time test represent a possible interaction between creep and fatigue. Frequency, R-ratio, environment, and hold-period and their synergistic effects on crack growth at elevated temperature were studied. All alloys show a predominantly transgranular crack advance mode when cycled at frequencies above 0.5 Hz. At lower frequencies, the failure in 310 SS transitions to a predominantly intergranular mode while Hastelloy X remains transgranular. Alloy 800H shows a mixed failure mode at intermediate and low frequencies. High R-ratio, temperature, and low frequency can combine to enhance the time-dependent crack growth at elevated temperature and creep damage are predominant in these cases.","Creep crack growth rate correlates well with C* for all alloys, and can be extended to correlate fatigue with hold time loading conditions for Alloy 800H and 310 SS, but not for Hastelloy X under the conditions studied here. It was found that hold time crack growth were creep-controlled in Alloy 800H and 310 SS while fatigue-controlled in Hastelloy X. These crack growth observations were supplemented by microhardness, microstructural, and load response measurements. Creep crack growth rate predictions based on a local critical strain criterion were also examined and found to agree with experimental results in this study.","Made available in DSpace on 2011-05-07T14:18:14Z (GMT). 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The loading-unloading (fatigue) and hold (creep) in a hold time test represent a possible interaction between creep and fatigue. Frequency, R-ratio, environment, and hold-period and their synergistic effects on crack growth at elevated temperature were studied. All alloys show a predominantly transgranular crack advance mode when cycled at frequencies above 0.5 Hz. At lower frequencies, the failure in 310 SS transitions to a predominantly intergranular mode while Hastelloy X remains transgranular. Alloy 800H shows a mixed failure mode at intermediate and low frequencies. High R-ratio, temperature, and low frequency can combine to enhance the time-dependent crack growth at elevated temperature and creep damage are predominant in these cases.","Creep crack growth rate correlates well with C* for all alloys, and can be extended to correlate fatigue with hold time loading conditions for Alloy 800H and 310 SS, but not for Hastelloy X under the conditions studied here. It was found that hold time crack growth were creep-controlled in Alloy 800H and 310 SS while fatigue-controlled in Hastelloy X. These crack growth observations were supplemented by microhardness, microstructural, and load response measurements. Creep crack growth rate predictions based on a local critical strain criterion were also examined and found to agree with experimental results in this study.","Made available in DSpace on 2011-05-07T14:18:14Z (GMT). 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