Journal
SCRIPTA MATERIALIA
Volume 215, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114685
Keywords
Hot ductility; Twip steel; MnS; Inoculation; Orientation relationship
Categories
Funding
- POSCO [4.0020945]
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By inoculating TWIP steel with MnS-containing master alloy, the as-cast structure can be refined to improve hot ductility and achieve finer grain sizes.
Transverse cracking is the main issue during continuous casting of TWIP steels due to degraded hot ductility at 700-950 degrees C. In this study, we improve the hot ductility of an 18.1Mn-0.68C-1.5Al (wt.%) TWIP steel by refining the as-cast structure via inoculation. Inoculation was implemented by direct addition of MnS-containing master alloy to the melt. Since MnS did not dissolve in the melt, they acted as heterogeneous nucleation sites for austenite nucleation. Consequently, MnS-inoculated steel shows finer grain sizes than reference steel. Additionally, MnS particles are found to have a polygonal shape, randomly distribute, and share a cube-on-cube orientation relationship with austenite; both habit planes are parallel to {111}. A periodic array of b= 1/ 6<112> edge dislocations at every fourth {222} planes of MnS is necessary to accommodate the large lattice misfit of the cube-cube relationship. The MnS-inoculated TWIP steel shows significantly improved hot ductility compared to previously reported TWIP steels.
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