Transactions of Materials and Heat Treatment

Title：Hot deformation and microstructure properties on automotive medium manganese steel with high strength-ductility balance

Authors： Su Zhanglei Li Wei Luo Zhimin

Unit： Henan Vocational College of Agricultural Zhengzhou University

KeyWords： medium manganese steel hot compression deformation austenite reverse transformation annealing microstructure mechanical property

ClassificationCode：TG142.1

year,vol(issue):pagenumber：2022,47(8):241-248

Abstract：

The influences of hot compression deformation amounts(0%, 25%, 50% and 75%) on the microstructure and mechanical properties of austenitic reverse transformation annealed automotive medium manganese steel were studied by means of scanning electron microscope, transmission electron microscope and tensile testing machine. The results show that with the increasing of hot compression deformation amount from 0% to 75%, the average width of martensitic lath in annealed medium manganese steel decreases from 0.96 μm to 0.34 μm, the average particle diameter of carbide decreases from Φ38 nm to Φ20 nm, and the volume fraction of carbide increases with the increasing of hot compression deformation amounts. The austenite content, elongation and strength-ductility balance of annealed medium manganese steel after hot compression deformation treatment are higher than those of samples without hot compression deformation. When the hot compression deformation amount is 50% and 75%, the strength-ductility balance of annealed medium manganese steel is higher than 33.4 GPa·%, which meets the requirements of the third generation automotive steel for the strength-ductility balance ≥30 GPa·%. It is mainly related to the fine lath martensite and small size and large volume fraction of carbide in annealed medium manganese steel after hot compression deformation.

Funds：

郑州市科技攻关项目（173SGYG2612232）；国家自然科学基金资助项目（21908217）

作者简介：苏张磊（1981-），男，硕士，讲师，E-mail：suzhanglei@hnca.edu.cn

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