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Tailoring the austenite characteristics via dual nanoparticles to synergistically optimize the strength-ductility in cold rolled medium Mn steel by Qizhe Ye; Haokai Dong; Qinyi Guo; Yishuang Yu; Lijie Qiao; Yu Yan is a Engineering article available to read on EtoBox.

What is Tailoring the austenite characteristics via dual nanoparticles to synergistically optimize the strength-ductility in cold rolled medium Mn steel about?

In this work, we proposed a novel Cu/θ dual nanoparticles strategy to tailor the austenite characteristics of a medium Mn steel via a tempering-annealing process to optimize the mechanical properties. We explored the effects of Cu-rich particles and cementite precipitated in the tempering process on the austenite reversion during the subsequent annealing process. Both experiments and numerical simulations verified that the austenite inherited from cementite had a finer size and a higher Mn enrichment compared with the austenite originating from the tempered martensite matrix. In addition, quantitative evaluations revealed that the pinning effect exerted by the Cu-rich particles could significantly hinder the α/γ interface migration and the recrystallized grain growth, thereby further refining the final microstructure. With contributions from the effects of dual nanoprecipitates on the austenite reversion, the heterogeneous austenite grains inherited from varying nucleation sites ensured the sustained and gradual deformation-induced martensite and twinning formation. Therefore, the Cu-added steels subjected to a tempering-annealing process achieved synergetic enhancement of the tens

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Author

Qizhe Ye; Haokai Dong; Qinyi Guo; Yishuang Yu; Lijie Qiao; Yu Yan

Publisher

Elsevier BV

Published

2024

Language

EN

Field

Engineering (Physical Sciences)