Elsevier

Scripta Materialia

Volume 187, October 2020, Pages 274-279
Scripta Materialia

Improving Mn partitioning and mechanical properties through carbides-enhancing pre-annealing in Mn-reduced transformation-induced plasticity steel

https://doi.org/10.1016/j.scriptamat.2020.06.027Get rights and content

Abstract

A novel processing strategy was proposed, first to promote Mn partitioning behavior during intercritical annealing, second to improve the fraction and stability of retained austenite (RA) and third to enhance mechanical properties of Mn-reduced transformation-induced plasticity (TRIP) steel. By deliberately preparing large-fractioned Mn-enriched cementite before final annealing, the intercritical austenite  was encouraged to inherit relatively high Mn content from pre-existing cementite. Eventually, the formation of sufficiently stable RA together with the precipitation of fine VC particles in ferritic matrix contributes to much better yield strength-tensile strength-ductility combination of 763 MPa-1022 MPa-46.4%, which is superior to many steels containing higher Mn concentrations.

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Declaration of Competing Interest

This manuscript has not been published or presented elsewhere in part or in entirety and is not under consideration by another journal. We have read and understood your journal's policies, and we believe that neither the manuscript nor the study violates any of these. There are no conflicts of interest to declare.

Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51974085 and 51674080), National Key R&D Program of China (2017YFB0304105) and Shandong Provincial Key R&D Program (2019TSLH0103), The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China.

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