{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/22654"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/22654","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Magnetic analysis of nuclear pressure vessel steels and other ferromagnetic materials subject to neutron irradiation and heat treatment","abstract":"Mechanical and magnetic property changes due to neutron irradiation and heat treatment were investigated for the sake of developing a nondestructive method of monitoring nuclear pressure vessel steel embrittlement during reactor operation. Four kinds of samples, including pressure vessel steel, pure Fe and Ni, Fe-Cu alloys and Charpy surveillance coupons, were examined. An automated magnetic property measuring system was constructed and measuring schemes were established. Microhardness and magnetic coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the pinning mechanisms of dislocations and domain walls are different with respect to the effective pinning parameters. However, stress relaxation has similar effects on both microhardness and magnetic coercivity. It is concluded that the selection of testing material, specimen size and shape, and magnetizing scheme are important factors for constructing a nondestructive testing method for reactor pressure vessel surveillance.","abstract_html":"Mechanical and magnetic property changes due to neutron irradiation and heat treatment were investigated for the sake of developing a nondestructive method of monitoring nuclear pressure vessel steel embrittlement during reactor operation. Four kinds of samples, including pressure vessel steel, pure Fe and Ni, Fe-Cu alloys and Charpy surveillance coupons, were examined. An automated magnetic property measuring system was constructed and measuring schemes were established. Microhardness and magnetic coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the pinning mechanisms of dislocations and domain walls are different with respect to the effective pinning parameters. However, stress relaxation has similar effects on both microhardness and magnetic coercivity. It is concluded that the selection of testing material, specimen size and shape, and magnetizing scheme are important factors for constructing a nondestructive testing method for reactor pressure vessel surveillance.","abstract_has_math":false,"creators":["Shong, Wei-Ja"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Nuclear, Plasma, and Radiological Engineering","degree_department":null,"school":null,"contributors":["Stubbins, James F."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T13:46:57Z","date_published":"2011-05-07T13:46:57Z","updated_at":"2026-07-22T22:25:20Z","subjects":["Engineering, Nuclear","Engineering, Metallurgy","Engineering, Materials Science"],"languages":["eng"],"rights":["Copyright 1995 Shong, Wei-Ja"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9624498","(UMI)AAI9624498"],"render_values":[{"text":"AAI9624498","href":null,"code":true},{"text":"(UMI)AAI9624498","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/22654","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":["Shong, Wei-Ja"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T13:46:57Z","10000-01-01","1995"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Nuclear, Plasma, and Radiological Engineering"]},{"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","Engineering, Metallurgy","Engineering, Materials Science"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1995 Shong, Wei-Ja"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9624498","(UMI)AAI9624498","http://hdl.handle.net/2142/22654"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Mechanical and magnetic property changes due to neutron irradiation and heat treatment were investigated for the sake of developing a nondestructive method of monitoring nuclear pressure vessel steel embrittlement during reactor operation. Four kinds of samples, including pressure vessel steel, pure Fe and Ni, Fe-Cu alloys and Charpy surveillance coupons, were examined. An automated magnetic property measuring system was constructed and measuring schemes were established. Microhardness and magnetic coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the pinning mechanisms of dislocations and domain walls are different with respect to the effective pinning parameters. However, stress relaxation has similar effects on both microhardness and magnetic coercivity. It is concluded that the selection of testing material, specimen size and shape, and magnetizing scheme are important factors for constructing a nondestructive testing method for reactor pressure vessel surveillance.","Made available in DSpace on 2011-05-07T13:46:57Z (GMT). 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Four kinds of samples, including pressure vessel steel, pure Fe and Ni, Fe-Cu alloys and Charpy surveillance coupons, were examined. An automated magnetic property measuring system was constructed and measuring schemes were established. Microhardness and magnetic coercivity, remanence, permeability, and hysteresis loss were measured as a function of a variety of irradiation and annealing exposures. The results were interpreted in terms of dislocation and magnetic domain wall pinning mechanisms and internal stress relaxation. It is found that the pinning mechanisms of dislocations and domain walls are different with respect to the effective pinning parameters. However, stress relaxation has similar effects on both microhardness and magnetic coercivity. It is concluded that the selection of testing material, specimen size and shape, and magnetizing scheme are important factors for constructing a nondestructive testing method for reactor pressure vessel surveillance.","Made available in DSpace on 2011-05-07T13:46:57Z (GMT). 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