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STUDY OF THE AUSTENITE DECOMPOSITION AND FORMATION OF PROEUTECTOID CEMENTITE IN HYPER-EUTECTOID STEELS

Ordóñez , Raymundo (2012) STUDY OF THE AUSTENITE DECOMPOSITION AND FORMATION OF PROEUTECTOID CEMENTITE IN HYPER-EUTECTOID STEELS. Doctoral Dissertation, University of Pittsburgh.

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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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    Item Type: University of Pittsburgh ETD
    Creators/Authors:
    CreatorsEmailORCID
    Ordóñez , Raymundoroo7@pitt.com
    ETD Committee:
    ETD Committee TypeCommittee MemberEmailORCID
    Thesis AdvisorDeArdo, Anthonyajdeardo.pitt@gmail.com
    Committee MemberVallejo, Luis Evallejo@civ.pitt.edu
    Committee ChairMao, Scott Xsxm2@pitt.edu
    Committee MemberGarcia, Calixto Igarcia@engr.pitt.edu
    Title: STUDY OF THE AUSTENITE DECOMPOSITION AND FORMATION OF PROEUTECTOID CEMENTITE IN HYPER-EUTECTOID STEELS
    Status: Published
    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.
    Date: 02 February 2012
    Date Type: Publication
    Defense Date: 11 August 2011
    Approval Date: 02 February 2012
    Submission Date: 22 November 2011
    Release Date: 02 February 2012
    Access Restriction: No restriction; The work is available for access worldwide immediately.
    Patent pending: No
    Number of Pages: 169
    Institution: University of Pittsburgh
    Thesis Type: Doctoral Dissertation
    Refereed: Yes
    Degree: PhD - Doctor of Philosophy
    Uncontrolled Keywords: Austenite Proeutectoid cementite Interlamellar spacing
    Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
    Date Deposited: 02 Feb 2012 13:01
    Last Modified: 16 Jul 2014 17:03

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