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- Title
Evolution of Microstructure During the In Situ Heating of 42 Pct Cold-Rolled High Mn Steel.
- Authors
Pramanik, Sudipta; Mitchell, David R. G.; Saleh, Ahmed A.; Gazder, Azdiar A.; Pereloma, Elena V.
- Abstract
An Fe-17Mn-3Al-2Si-1Ni-0.06C wt pct high Mn steel was cold rolled to 42 pct thickness reduction, leading to a mixed microstructure of ε- and α′-martensite along with a trace amount of austenite (γ). The reverse transformation of ε- and α′-martensite to γ was tracked by in situ heating from room temperature up to 800 °C followed by 600 seconds holding in a transmission electron microscope. The transformation of ε- and α′-martensite to γ followed the Shoji-Nishiyama (S-N) and Kurdjumov-Sachs (K-S) orientation relationships, respectively. No changes in the grain shape or motion of any interfaces between ε-martensite/γ and α′-martensite/γ were observed during the reverse transformation process. The γ reverted from ε-martensite contained fine twins upon recovery, and a mechanism is proposed for the formation of these twins.
- Subjects
MICROSTRUCTURE; ROLLED steel; MARTENSITE; AUSTENITE; TRANSMISSION electron microscopy; METALLURGY
- Publication
Metallurgical & Materials Transactions. Part A, 2019, Vol 50, Issue 2, p562
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-018-5011-7