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

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外文摘要：In this work,we proposed a novel Cu/θ dual nanoparticles strategy to tailor the austenite characteris-tics 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 simula-tions 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 mi-crostructure.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 tensile strength from 1055 MPa to 1250 MPa and elongation from 33％to 45％.This strategy may provide new guidance for the development and alloy design of high-performance medium Mn steels.

外文关键词：

Dual nanoparticlesMedium Mn steelTempering-annealing processAustenite reversionMechanical properties

作者：

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

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作者单位：

Beijing Advanced Innovation Center for Materials Genome Engineering,Corrosion and Protection Center,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China

School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China

School of Biomedical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

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基金：

国家自然科学基金

项目编号：

U1964204

出版年：

2024

DOI：

10.1016/j.jmst.2023.07.002

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.169(2)

参考文献量74