Janbanjong, Petch
(2016)
New Observations on Flash Bainite.
Master's Thesis, University of Pittsburgh.
(Unpublished)
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Abstract
Flash bainite is a new type of microstructure developed from new heat treatment process called “Flash Processing”. Using less treatment time, the result is the high performance steel with mixed microstructure of bainite and martensite. This research aimed to study the characteristics of this process using typical low carbon steel, with 0.1-wt% C. The experiments have been done with two similar types of steels, one with vanadium and one without. Two rates of heat treatment and 3 different heating temperatures have been set up and experiments were conducted to twelve samples. The results show 2 groups of different samples, with and without bainite in the final microstructure. The samples that were heat-treated to 950 °C resulted in fractions of bainite in the end. The microstructures and characteristics of flash bainite have been studied morphologically using OM, SEM and EBSD. OM results and SEM results confirmed that the formation of bainite in flash processed steel was because of the incomplete carbides dissolution and carbon concentration gradients. SEM results showed that flash bainite samples showed characteristics of upper-bainite morphology, specifically bainitic ferrite type. EBSD results also confirmed the characteristics of bainite and the contribution to mechanical properties of the microstructures. The hardness test showed outstandingly high value in the range of 380-390 HV, even when compared to typical bainite and martensite. The comparisons of typical flash bainite and flash bainite developed in the research have been made and concluded. Also, the comparisons between typical bainite and flash bainite have been made to confirm the type of bainite developed in this research in morphological aspect. The results showed that flash bainite could be considered as a valuable option of steels in the future. However, further experiments should be made to confirm mechanical properties of this type of steels.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| Date: |
15 June 2016 |
| Date Type: |
Publication |
| Defense Date: |
30 March 2016 |
| Approval Date: |
15 June 2016 |
| Submission Date: |
30 March 2016 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Number of Pages: |
103 |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Materials Science and Engineering |
| Degree: |
MS - Master of Science |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
Flash Bainite, Bainite, Martensite |
| Date Deposited: |
15 Jun 2016 13:41 |
| Last Modified: |
16 Jun 2016 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/27445 |
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