Journal
SCRIPTA MATERIALIA
Volume 218, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114822
Keywords
Ferrite transformation; Advanced high strength steel; Retained austenite; Chemical heterogeneity; Mechanical property
Categories
Funding
- National Natural Science Foundation of China [52104380, 52171123]
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In this study, a chemical heterogeneity of Mn was introduced into the parent austenite of a Fe-0.2C-2Mn steel. By promoting C partitioning during the austenite to ferrite transformation, the Mn-rich regions in the parent austenite were substantially stabilized, resulting in a multiphase microstructure with improved strength and ductility. This provides a simple alternative route to acquire retained austenite in advanced high strength steels without the need of Si and Al alloying.
A chemical heterogeneity of Mn is introduced into the parent austenite of a Fe-0.2C-2Mn steel. The Mn-rich regions in the parent austenite is substantially stabilized by a promoted C partitioning during the austenite to ferrite transformation, without which these regions cannot be preserved as retained austenite. Following this strategy, a multiphase microstructure is achieved which presents a better combination of strength (ultimate strength of 977 MPa) and ductility (uniform elongation of 17.9%) as compared with that of other Si-or Al-added AHSSs of similar compositions. The results here suggest an alternative, yet a simple route, to acquire retained austenite in advanced high strength steels without the need of Si and Al alloying.
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