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Fundamental Study of Phase Transformations in Si-Al TRIP Steels

Parish, Chad Michael (2003) Fundamental Study of Phase Transformations in Si-Al TRIP Steels. Master's Thesis, University of Pittsburgh. (Unpublished)

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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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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Parish, Chad Michaelcmpst52@pitt.eduCMPST52
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairDeArdo, A J
Committee CoChairGarcia, C I
Committee MemberNettleship, 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:, etd-05072003-104824
Date Deposited: 10 Nov 2011 19:43
Last Modified: 15 Nov 2016 13:43


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