Effect of the intercritical annealing in the formability and microstructure of a medium Mn steel sheet

A medium Mn steel (MMS) was cast by employing a vacuum induction furnace. After that, the steel was hot rolled (HR) in order to achieve a final thickness of 1.4 mm. The microstructure of the sheet was found to be composed of martensite and a little amount of austenite, the Ultimate Tensile Strength...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2023-06, Vol.1284 (1), p.12030
Main Authors: Hernández-Rivera, J L, González-Castillo, A C, Ramos Azpeitia, M O, Garay-Reyes, C G
Format: Article
Language:English
Subjects:
Annealing
Austenite
Elongation
Heat treatment
Manganese steels
Martensite
Metal sheets
Microstructure
Ultimate tensile strength
Vacuum induction furnaces
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Summary:A medium Mn steel (MMS) was cast by employing a vacuum induction furnace. After that, the steel was hot rolled (HR) in order to achieve a final thickness of 1.4 mm. The microstructure of the sheet was found to be composed of martensite and a little amount of austenite, the Ultimate Tensile Strength (UTS in this processing condition was close to 1600 MPa and a negligible elongation was found. An intercritical annealing (IA) heat treatment was applied to the steel to promote the austenite reversion and increase its amount and stability. Previous thermodynamic simulations and experimental results were used to determine the temperature and time parameters of the IA. After the steel was subjected to this heat treatment, it exhibited an elongation close to 35% and an UTS close to 1100 MPa. Bendability testing was carried out in that condition in order to correlate it with the microstructural changes in the sheet. It was found that the critical bending angle was higher in the IA condition in comparison with the HR state.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1284/1/012030