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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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Details

Item Type: University of Pittsburgh ETD
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Ordóñez , Raymundoroo7@pitt.comroo7@pitt.com
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorDeArdo, Anthonyajdeardo.pitt@gmail.com ajdeardo.pitt@gmail.com
Committee MemberVallejo, Luis Evallejo@civ.pitt.edu vallejo@civ.pitt.edu
Committee ChairMao, Scott Xsxm2@pitt.edusxm2@pitt.edu
Committee MemberGarcia, Calixto Igarcia@engr.pitt.edu garcia@engr.pitt.edu
Date: 2 February 2012
Date Type: Publication
Defense Date: 11 August 2011
Approval Date: 2 February 2012
Submission Date: 22 November 2011
Release Date: 2 February 2012
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 169
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Austenite Proeutectoid cementite Interlamellar spacing
Date Deposited: 02 Feb 2012 18:01
Last Modified: 16 Jul 2014 21:03
URI: http://d-scholarship.pitt.edu/id/eprint/10531

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