scholarly journals Strengthening Mechanism and Carbide Precipitation Behavior of Nb-Mo Microalloy Medium Mn Steel

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7461
Author(s):  
Chunquan Liu ◽  
Fen Xiong ◽  
Yong Wang ◽  
Yuxin Cao ◽  
Xinbin Liu ◽  
...  
Keyword(s):  
Intercritical Annealing ◽  
Strengthening Mechanism ◽  
Carbide Precipitation ◽  
Reverse Transformation ◽  
Precipitation Behavior ◽  
Medium Mn Steel ◽  
Mn Content ◽  
Cyclic Quenching ◽  
Mn Steel ◽  
Positive Effect

This study investigates the strengthening mechanism and carbide precipitation behavior of medium Mn steel with Nb-Mo microalloy after cyclic quenching and austenite reverse transformation treatment. The results show that the Nb/Mo element not only precipitates (Nb,Mo)C in the grains, hindering the movement of dislocations and increases the strength, but also segregates at the austenite/ferrite grain boundary, thus delaying the transformation from austenite to ferrite. In addition, a large amount of nano-scale cementite is retained after cyclic quenching and austenite reverse transformation, which has a positive effect on the proportion of retained austenite in medium Mn steel. Moreover, the carbides with small size and low Mn content are dissolved, and the decomposed C and Mn content are beneficial to the nucleation of austenite during the intercritical annealing process at a temperature of 690 °C.

Carbide precipitation behavior and mechanical properties of micro-alloyed medium Mn steel

2020 ◽  
Vol 47 ◽  
pp. 122-130 ◽  
Author(s):  
Luhan Hao ◽  
Xiang Ji ◽  
Guangqian Zhang ◽  
Wei Zhao ◽  
Mingyue Sun ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbide Precipitation ◽  
Precipitation Behavior ◽  
Medium Mn Steel ◽  
Mn Steel

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 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.

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