Ordóñez , Raymundo
(2012)
STUDY OF THE AUSTENITE DECOMPOSITION AND FORMATION OF PROEUTECTOID CEMENTITE IN HYPER-EUTECTOID STEELS.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
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: |
Unpublished |
Creators/Authors: |
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ETD Committee: |
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Date: |
2 February 2012 |
Date Type: |
Publication |
Defense Date: |
11 August 2011 |
Approval Date: |
2 February 2012 |
Submission Date: |
22 November 2011 |
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: |
15 Nov 2016 13:55 |
URI: |
http://d-scholarship.pitt.edu/id/eprint/10531 |
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