Ordóñez , Raymundo STUDY OF THE AUSTENITE DECOMPOSITION AND FORMATION OF PROEUTECTOID CEMENTITE IN HYPER-EUTECTOID STEELS. Doctoral Dissertation, University of Pittsburgh.
Abstract
Eutectoid and hypereutectoid steels are extensively used for different engineering applications, because they offer a useful combination of strength and ductility as well as good corrosion resistance, wear resistance and machinability. In these steels, the major microstructural microconstituent is pearlite. However, depending on the chemical composition of the austenite prior to transformation and the thermal path during the decomposition of austenite, i.e., rate of cooling to the transformation temperature, the formation of proeutectoid cementite along the prior-austenite grain boundaries might take place. The presence of proeutectoid cementite along the austenite grain boundaries has a deleterious effect on the final mechanical properties of these fully pearlitic steels. Thermomechanical processing studies on hypereutectoid steels have shown that the composition and microstructural conditions of austenite prior to transformation to a fully pearlitic microstructure has a strong effect on reducing the formation of proeutectoid cementite along the austenite grain boundaries as well as the refinement of the interlamellar spacing. A study of the effect of different microstructural features and precipitation behavior on the mechanical properties and wear behavior is presented.
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Details |
| Item Type: | University of Pittsburgh ETD |
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| ETD Committee: | | ETD Committee Type | Committee Member | Email |
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| Thesis Advisor | DeArdo, Anthony | ajdeardo.pitt@gmail.com | | Committee Member | Vallejo, Luis E | vallejo@civ.pitt.edu | | Committee Chair | Mao, Scott X | sxm2@pitt.edu | | Committee Member | Garcia, Calixto I | garcia@engr.pitt.edu |
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| Title: | STUDY OF THE AUSTENITE DECOMPOSITION AND FORMATION OF PROEUTECTOID CEMENTITE IN HYPER-EUTECTOID STEELS |
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| Status: | Published |
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| Abstract: | Eutectoid and hypereutectoid steels are extensively used for different engineering applications, because they offer a useful combination of strength and ductility as well as good corrosion resistance, wear resistance and machinability. In these steels, the major microstructural microconstituent is pearlite. However, depending on the chemical composition of the austenite prior to transformation and the thermal path during the decomposition of austenite, i.e., rate of cooling to the transformation temperature, the formation of proeutectoid cementite along the prior-austenite grain boundaries might take place. The presence of proeutectoid cementite along the austenite grain boundaries has a deleterious effect on the final mechanical properties of these fully pearlitic steels. Thermomechanical processing studies on hypereutectoid steels have shown that the composition and microstructural conditions of austenite prior to transformation to a fully pearlitic microstructure has a strong effect on reducing the formation of proeutectoid cementite along the austenite grain boundaries as well as the refinement of the interlamellar spacing. A study of the effect of different microstructural features and precipitation behavior on the mechanical properties and wear behavior is presented. |
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| Defense Date: | 11 August 2011 |
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| Approval Date: | 02 February 2012 |
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| Submission Date: | 22 November 2011 |
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| Release Date: | 02 February 2012 |
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| Access Restriction: | No restriction; Release the ETD for access worldwide immediately. |
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| Patent pending: | No |
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| Number of Pages: | 169 |
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| Institution: | University of Pittsburgh |
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| Thesis Type: | Doctoral Dissertation |
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| Refereed: | Yes |
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| Degree: | PhD - Doctor of Philosophy |
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| Uncontrolled Keywords: | Austenite Proeutectoid cementite Interlamellar spacing |
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| Schools and Programs: | Swanson School of Engineering > Materials Science and Engineering |
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| Date Deposited: | 02 Feb 2012 13:01 |
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| Last Modified: | 03 Feb 2012 01:15 |
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