{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/8678"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/8678","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Microstructural and property assessment of creep aged 12cr steel after welding","abstract":"The electricity public utility of Eskom (South Africa) has an ageing fleet of power generation equipment and due to shortage of capacity there is limited time for maintenance and replacements. Complete main steam pipework replacements are not practical and in many instances selective welding must be done on creep aged and sometimes creep damaged material. The question arises whether these repair welds damage the components to an unacceptable degree or not, and a complete replacement can be avoided. This work aims at studying the effect of the welding process on the damage state of the material on the example of the widely used X20 steel and advising Eskom on the weldability limits of this steel. Real welds consisting of new and creep aged steel were prepared and characterised. Furthermore, the heat input was simulated in additional samples using Gleeble thermomechanical equipment.","abstract_html":"The electricity public utility of Eskom (South Africa) has an ageing fleet of power generation equipment and due to shortage of capacity there is limited time for maintenance and replacements. Complete main steam pipework replacements are not practical and in many instances selective welding must be done on creep aged and sometimes creep damaged material. The question arises whether these repair welds damage the components to an unacceptable degree or not, and a complete replacement can be avoided. This work aims at studying the effect of the welding process on the damage state of the material on the example of the widely used X20 steel and advising Eskom on the weldability limits of this steel. Real welds consisting of new and creep aged steel were prepared and characterised. Furthermore, the heat input was simulated in additional samples using Gleeble thermomechanical equipment.","abstract_has_math":false,"creators":["Molokwane, Teboho Jacob"],"institution":"Centre for Materials Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Sonderegger, B","Knutsen, Robert D"],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013","date_published":"2013","updated_at":"2026-07-22T22:23:12Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/8678","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Sonderegger, B","Knutsen, Robert D"]},{"key":"dc:creator","label":"Author","values":["Molokwane, Teboho Jacob"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-10-21T13:38:20Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-10-21T13:38:20Z"]},{"key":"dc:date.issued","label":"Date","values":["2013"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Centre for Materials Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cape Town"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Masters"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["MSc"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/8678"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Includes bibliographical references."]},{"key":"dc:description.abstract","label":"Abstract","values":["The electricity public utility of Eskom (South Africa) has an ageing fleet of power generation equipment and due to shortage of capacity there is limited time for maintenance and replacements. Complete main steam pipework replacements are not practical and in many instances selective welding must be done on creep aged and sometimes creep damaged material. The question arises whether these repair welds damage the components to an unacceptable degree or not, and a complete replacement can be avoided. This work aims at studying the effect of the welding process on the damage state of the material on the example of the widely used X20 steel and advising Eskom on the weldability limits of this steel. Real welds consisting of new and creep aged steel were prepared and characterised. Furthermore, the heat input was simulated in additional samples using Gleeble thermomechanical equipment."]},{"key":"dc:title","label":"Title","values":["Microstructural and property assessment of creep aged 12cr steel after welding"]}]}],"canonical_facts":{"dc:contributor.advisor":["Sonderegger, B","Knutsen, Robert D"],"dc:creator":["Molokwane, Teboho Jacob"],"dc:date.accessioned":["2014-10-21T13:38:20Z"],"dc:date.available":["2014-10-21T13:38:20Z"],"dc:date.issued":["2013"],"dc:description":["Includes bibliographical references."],"dc:description.abstract":["The electricity public utility of Eskom (South Africa) has an ageing fleet of power generation equipment and due to shortage of capacity there is limited time for maintenance and replacements. Complete main steam pipework replacements are not practical and in many instances selective welding must be done on creep aged and sometimes creep damaged material. The question arises whether these repair welds damage the components to an unacceptable degree or not, and a complete replacement can be avoided. This work aims at studying the effect of the welding process on the damage state of the material on the example of the widely used X20 steel and advising Eskom on the weldability limits of this steel. Real welds consisting of new and creep aged steel were prepared and characterised. Furthermore, the heat input was simulated in additional samples using Gleeble thermomechanical equipment."],"dc:identifier.uri":["http://hdl.handle.net/11427/8678"],"dc:language.iso":["eng"],"dc:publisher.department":["Centre for Materials Engineering"],"dc:publisher.institution":["University of Cape Town"],"dc:title":["Microstructural and property assessment of creep aged 12cr steel after welding"],"dc:type":["Master Thesis"],"dc:type.qualificationlevel":["Masters"],"dc:type.qualificationname":["MSc"]},"updated_at":"2026-07-22T22:23:12Z"}