An ultrahigh strength and enhanced ductility cold-rolled medium-Mn steel treated by intercritical annealing

2018 ◽  
Vol 154 ◽  
pp. 30-33 ◽  
Author(s):  
Xuan Li ◽  
Renbo Song ◽  
Naipeng Zhou ◽  
Jiajia Li
Keyword(s):  
Intercritical Annealing ◽  
Ultrahigh Strength ◽  
Medium Mn Steel ◽  
Cold Rolled ◽  
Mn Steel

scholarly journals Enhancing the Robustness and Efficiency in the Production of Medium Mn Steels by Al Addition

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1432
Author(s):  
Maokun Bai ◽  
Dapeng Yang ◽  
Guodong Wang ◽  
Joohyun Ryu ◽  
Kyooyoung Lee ◽  
...  
Keyword(s):  
Tensile Deformation ◽  
Intercritical Annealing ◽  
Industrial Process ◽  
Process Window ◽  
Continuous Annealing ◽  
Austenite Stability ◽  
Medium Mn Steel ◽  
Reverted Austenite ◽  
Cold Rolled ◽  
Mn Steel

The narrow process window during intercritical annealing and discontinuous yielding have limited the commercialization of medium Mn steels. In this study, a double-annealing process based on the commercial continuous annealing line is proposed. The cold-rolled medium Mn steels were first fully austenitized and quenched during the first annealing, followed by intercritical annealing for reverted austenite transformation. The microstructure of duplex lath-shaped austenite and ferrite is produced and steel exhibits a desirable continuous yielding during tensile deformation. Al is added into the medium Mn steel to enlarge the process window and to improve the partitioning efficiency of Mn. The produced steel is more robust with temperature fluctuation during the industrial process due to the enlarged intercritical region. Mn partitioning is more efficient owing to the elevated annealing temperature, which results in the improvement of ductility in the Al-added steel with increased austenite stability.

Austenite/ferrite interface movement during intercritical annealing of a medium Mn steel

2021 ◽  
pp. 1-7
Author(s):  
M. K. Bai ◽  
D. P. Yang ◽  
G. D. Wang ◽  
J. H. Ryu ◽  
K. Y. Lee ◽  
...  
Keyword(s):  
Intercritical Annealing ◽  
Medium Mn Steel ◽  
Mn Steel ◽  
Interface Movement

On the intercritical annealing parameters and ensuing mechanical properties of low-carbon medium-Mn steel

2018 ◽  
Vol 733 ◽  
pp. 246-256 ◽  
Author(s):  
G.K. Bansal ◽  
D.A. Madhukar ◽  
A.K. Chandan ◽  
Ashok K. ◽  
G.K. Mandal ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Intercritical Annealing ◽  
Low Carbon ◽  
Medium Mn Steel ◽  
Mn Steel

scholarly journals Influence of Microstructural Morphology on Hydrogen Embrittlement in a Medium-Mn Steel Fe-12Mn-3Al-0.05C

Metals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 929 ◽  
Author(s):  
Xiao Shen ◽  
Wenwen Song ◽  
Simon Sevsek ◽  
Yan Ma ◽  
Claas Hüter ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
The Other ◽  
Duplex Microstructure ◽  
Ultrafine Grained ◽  
Medium Mn Steel ◽  
Microstructural Morphology ◽  
Cold Rolled ◽  
Mixed Microstructure ◽  
Mn Steel

The ultrafine-grained (UFG) duplex microstructure of medium-Mn steel consists of a considerable amount of austenite and ferrite/martensite, achieving an extraordinary balance of mechanical properties and alloying cost. In the present work, two heat treatment routes were performed on a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C (wt.%) to achieve comparable mechanical properties with different microstructural morphologies. One heat treatment was merely austenite-reverted-transformation (ART) annealing and the other one was a successive combination of austenitization (AUS) and ART annealing. The distinct responses to hydrogen ingression were characterized and discussed. The UFG martensite colonies produced by the AUS + ART process were found to be detrimental to ductility regardless of the amount of hydrogen, which is likely attributed to the reduced lattice bonding strength according to the H-enhanced decohesion (HEDE) mechanism. With an increase in the hydrogen amount, the mixed microstructure (granular + lamellar) in the ART specimen revealed a clear embrittlement transition with the possible contribution of HEDE and H-enhanced localized plasticity (HELP) mechanisms.

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