Parish, Chad Michael
(2003)
Fundamental Study of Phase Transformations in Si-Al TRIP Steels.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
TRIP steels are under development for automotive applications that require high strength and simultaneous high formability. This study was undertaken to examine the phase transformations occurring during the processing of a cold-rolled TRIP steel. The TRIP microstructure is comprised of ferrite, bainite and retained austenite. This microstructure is obtained by controlled cooling from the intercritical annealing temperature to the isothermal bainitic holding temperature. The effects of cooling rate from intercritical annealing temperature to isothermal transformation temperature, as well as isothermal transformation time, were studied via optical microscopy, SEM, TEM, XRD, magnetometry, dilatometry and mechanical testing. A CCT curve for one intercritically annealed TRIP steel was produced. Conclusions are drawn regarding the effects of processing parameters on phase balance (ferrite, bainite, austenite, martensite and pearlite) and mechanical properties. Suggestions for future work are also made.
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Details
| Item Type: |
University of Pittsburgh ETD
|
| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
| Title | Member | Email Address | Pitt Username | ORCID |
|---|
| Committee Chair | DeArdo, A J | | | | | Committee CoChair | Garcia, C I | | | | | Committee Member | Nettleship, I | | | |
|
| Date: |
3 September 2003 |
| Date Type: |
Completion |
| Defense Date: |
22 April 2003 |
| Approval Date: |
3 September 2003 |
| Submission Date: |
7 May 2003 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Materials Science and Engineering |
| Degree: |
MSMSE - Master of Science in Materials Science and Engineering |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
bainite; CCT curve; epitaxial ferrite; retained austenite; TEM; XRD; dilatometry; TRIP steel; intercritical annealing |
| Other ID: |
http://etd.library.pitt.edu:80/ETD/available/etd-05072003-104824/, etd-05072003-104824 |
| Date Deposited: |
10 Nov 2011 19:43 |
| Last Modified: |
15 Nov 2016 13:43 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/7812 |
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