{"id":{"repo_id":"ohiolink","oai_identifier":"oai:etd.ohiolink.edu:osu1365695328"},"canonical_url":"https://search.dev.ndltd.org/etd/ohiolink/oai:etd.ohiolink.edu:osu1365695328","repository":{"repo_id":"ohiolink","name":"OhioLINK","base_url":"https://etd.ohiolink.edu/acprod/odb_etd/ws/oai/oai"},"display":{"title":"An Experimental Evaluation of Micro-pitting Performance of Two Bearing Steels","abstract":"This experimental study focuses on the impact of operating conditions including entraining speed, sliding ratio, and load on micro-pitting performance of two typical bearing steels. Case hardened roller specimens made of alloy 9310 and through-hardened roller specimens made of alloy 485-2 are procured. Test matrices are defined according to the Latin Hypercube Space Filling Design of Experiment approach and executed to evaluate the micro-pitting performance of both materials by manipulating the speed, sliding ratio, load, and material. A two-disk test set-up is used for this purpose with each test documented by initial, interim, and final roughness, wear, and micro-pitting measurements. Before each test, a run-in process is implemented for the purpose of surface roughness break-in. By counting the distributed micro-pitted areas on the surface, a Micro-pitting Severity Index (MSI), defined as the ratio of the total micro-pitted area to the entire inspection area, is quantified for every test condition. Results indicate that the 9310 specimens showed significantly better resistance to micro-pitting compared to the 485-2 specimens, with nearly ten times lower MSI values. The data collected in this study establishes a database for micro-pitting failure of these two steel alloys that is required for validation of point contact lubrication models with circumferentially oriented surface roughnesses.","abstract_html":"This experimental study focuses on the impact of operating conditions including entraining speed, sliding ratio, and load on micro-pitting performance of two typical bearing steels. Case hardened roller specimens made of alloy 9310 and through-hardened roller specimens made of alloy 485-2 are procured. Test matrices are defined according to the Latin Hypercube Space Filling Design of Experiment approach and executed to evaluate the micro-pitting performance of both materials by manipulating the speed, sliding ratio, load, and material. A two-disk test set-up is used for this purpose with each test documented by initial, interim, and final roughness, wear, and micro-pitting measurements. Before each test, a run-in process is implemented for the purpose of surface roughness break-in. By counting the distributed micro-pitted areas on the surface, a Micro-pitting Severity Index (MSI), defined as the ratio of the total micro-pitted area to the entire inspection area, is quantified for every test condition. Results indicate that the 9310 specimens showed significantly better resistance to micro-pitting compared to the 485-2 specimens, with nearly ten times lower MSI values. The data collected in this study establishes a database for micro-pitting failure of these two steel alloys that is required for validation of point contact lubrication models with circumferentially oriented surface roughnesses.","abstract_has_math":false,"creators":["Tilson, Nial Robert"],"institution":"The Ohio State University","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Mechanical Engineering","degree_department":null,"school":null,"contributors":["Kahraman, Ahmet"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2013,"date_issued":"2013-08-09","date_published":"2013-08-09","updated_at":"2026-07-24T03:37:31Z","subjects":["Engineering","Mechanical Engineering","Materials Science","Micro-pitting","micro-pit","elastohydrodynamic lubrication","ground specimens","surface failure"],"languages":["English"],"rights":["unrestricted","This thesis or dissertation is protected by copyright: all rights reserved. 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A two-disk test set-up is used for this purpose with each test documented by initial, interim, and final roughness, wear, and micro-pitting measurements. Before each test, a run-in process is implemented for the purpose of surface roughness break-in. By counting the distributed micro-pitted areas on the surface, a Micro-pitting Severity Index (MSI), defined as the ratio of the total micro-pitted area to the entire inspection area, is quantified for every test condition. Results indicate that the 9310 specimens showed significantly better resistance to micro-pitting compared to the 485-2 specimens, with nearly ten times lower MSI values. The data collected in this study establishes a database for micro-pitting failure of these two steel alloys that is required for validation of point contact lubrication models with circumferentially oriented surface roughnesses."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf","p.113","15.26 MB"]},{"key":"dc:title","label":"Title","values":["An Experimental Evaluation of Micro-pitting Performance of Two Bearing Steels"]}]}],"canonical_facts":{"dc:contributor":["Kahraman, Ahmet"],"dc:creator":["Tilson, Nial Robert"],"dc:date":["2013-08-09"],"dc:description":["This experimental study focuses on the impact of operating conditions including entraining speed, sliding ratio, and load on micro-pitting performance of two typical bearing steels. Case hardened roller specimens made of alloy 9310 and through-hardened roller specimens made of alloy 485-2 are procured. Test matrices are defined according to the Latin Hypercube Space Filling Design of Experiment approach and executed to evaluate the micro-pitting performance of both materials by manipulating the speed, sliding ratio, load, and material. A two-disk test set-up is used for this purpose with each test documented by initial, interim, and final roughness, wear, and micro-pitting measurements. Before each test, a run-in process is implemented for the purpose of surface roughness break-in. By counting the distributed micro-pitted areas on the surface, a Micro-pitting Severity Index (MSI), defined as the ratio of the total micro-pitted area to the entire inspection area, is quantified for every test condition. Results indicate that the 9310 specimens showed significantly better resistance to micro-pitting compared to the 485-2 specimens, with nearly ten times lower MSI values. 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