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Tuning austenite stability in a medium Mn steel and relationship to structure and mechanical properties

Journal Article


Abstract


  • We study here the underlying factors that govern the stability of austenite in a medium Mn (Fe���0.18C���11Mn���3.8Al) (wt-%) steel. In this regard, a novel heat treatment involving intercritical quenching and tempering was designed to obtain high total elongation (TEL) and high ultimate tensile strength (UTS) in the cold-rolled steel. And the UTS and TEL approached 920���1150 MPa and 35���65%, respectively. The product of TEL and UTS (PSE) exceeded 40 GPa%, with a maximum value of 60 GPa%. A detailed analysis of microstructure before and after tensile deformation revealed that the TRIP effect occurred and the stability of austenite was predominantly governed by the grain sizes of austenite rather than the orientation of austenite grains. The theoretical analysis of work hardening data suggested that the superior elongation of medium Mn TRIP steel is related to the high stability of austenite and the cooperative deformation of ferrite.

Publication Date


  • 2020

Citation


  • Li, Z. C., Li, X. J., Mou, Y. J., Misra, R. D. K., Ding, H., He, L. F., & Li, H. P. (2020). Tuning austenite stability in a medium Mn steel and relationship to structure and mechanical properties. Materials Science and Technology (United Kingdom), 36(12), 1308-1317. doi:10.1080/02670836.2020.1777650

Scopus Eid


  • 2-s2.0-85086908445

Start Page


  • 1308

End Page


  • 1317

Volume


  • 36

Issue


  • 12

Place Of Publication


Abstract


  • We study here the underlying factors that govern the stability of austenite in a medium Mn (Fe���0.18C���11Mn���3.8Al) (wt-%) steel. In this regard, a novel heat treatment involving intercritical quenching and tempering was designed to obtain high total elongation (TEL) and high ultimate tensile strength (UTS) in the cold-rolled steel. And the UTS and TEL approached 920���1150 MPa and 35���65%, respectively. The product of TEL and UTS (PSE) exceeded 40 GPa%, with a maximum value of 60 GPa%. A detailed analysis of microstructure before and after tensile deformation revealed that the TRIP effect occurred and the stability of austenite was predominantly governed by the grain sizes of austenite rather than the orientation of austenite grains. The theoretical analysis of work hardening data suggested that the superior elongation of medium Mn TRIP steel is related to the high stability of austenite and the cooperative deformation of ferrite.

Publication Date


  • 2020

Citation


  • Li, Z. C., Li, X. J., Mou, Y. J., Misra, R. D. K., Ding, H., He, L. F., & Li, H. P. (2020). Tuning austenite stability in a medium Mn steel and relationship to structure and mechanical properties. Materials Science and Technology (United Kingdom), 36(12), 1308-1317. doi:10.1080/02670836.2020.1777650

Scopus Eid


  • 2-s2.0-85086908445

Start Page


  • 1308

End Page


  • 1317

Volume


  • 36

Issue


  • 12

Place Of Publication