Persistent Link:
http://hdl.handle.net/10150/277066
Title:
Segregation and structure in continuously cast high carbon steel
Author:
Sung, Pil Kyung, 1961-
Issue Date:
1989
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
After hot rolling, the presense of segregation in the center of wire-rod can lead to a nonuniform transformation, resulting in bands of martensite in the microstructure. This is considered to be a defect, called center-martensite, because it can cause cracks and breaks during wire drawing. To identify the mechanism for the formation of center-martensite in wire-rod, the structure, macrosegregation and microsegregation in unworked billets were characterized. Based on measurements of secondary dendrite arm spacings, cooling rates during solidification were estimated. It appears that the macrosegregation of carbon and manganese in the billets manifests itself as the microsegregation in wire-rod, which is an agent in forming the center-martensite. Thus, electromagnetic stirring is proposed as a means to reduce the macrosegregation in the billet and, thereby, reduce the occurrence of center-martensite in wire-rod.
Type:
text; Thesis-Reproduction (electronic)
Keywords:
Carbon steel -- Defects.; Continuous casting.; Segregation (Metallurgy); Martensite.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Graduate College; Materials Science and Engineering
Degree Grantor:
University of Arizona
Advisor:
Poirier, David R.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleSegregation and structure in continuously cast high carbon steelen_US
dc.creatorSung, Pil Kyung, 1961-en_US
dc.contributor.authorSung, Pil Kyung, 1961-en_US
dc.date.issued1989en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractAfter hot rolling, the presense of segregation in the center of wire-rod can lead to a nonuniform transformation, resulting in bands of martensite in the microstructure. This is considered to be a defect, called center-martensite, because it can cause cracks and breaks during wire drawing. To identify the mechanism for the formation of center-martensite in wire-rod, the structure, macrosegregation and microsegregation in unworked billets were characterized. Based on measurements of secondary dendrite arm spacings, cooling rates during solidification were estimated. It appears that the macrosegregation of carbon and manganese in the billets manifests itself as the microsegregation in wire-rod, which is an agent in forming the center-martensite. Thus, electromagnetic stirring is proposed as a means to reduce the macrosegregation in the billet and, thereby, reduce the occurrence of center-martensite in wire-rod.en_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
dc.subjectCarbon steel -- Defects.en_US
dc.subjectContinuous casting.en_US
dc.subjectSegregation (Metallurgy)en_US
dc.subjectMartensite.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineMaterials Science and Engineeringen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorPoirier, David R.en_US
dc.identifier.proquest1337490en_US
dc.identifier.oclc22748103en_US
dc.identifier.bibrecord.b17494771en_US
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