Transactions of Materials and Heat Treatment

Title：Influence of deformation heat treatment on tensile properties and microstructure evolution for Fe-19Mn-2Al-0.6C round steel

Authors： Yao Bin Li Feng Zhang Guoqiang

Unit： Zhejiang Vocational College of Agriculture and Commerce Zhejiang Sci-Tech University Zhejiang Renda Machinery Manufacturing Co. Ltd.

KeyWords： Fe-19Mn-2Al-0.6C round steel rolling pre-deformation work hardening two-stage aging treatment microstructure

ClassificationCode：TG142

year,vol(issue):pagenumber：2022,47(8):208-214

Abstract：

The changes of microstructure and mechanical properties of Fe-19Mn-2Al-0.6C round steel during rolling pre-deformation stage were tested by rolling pre-deformation and two-stage aging treatment. The results show that pre-deformed specimens can obtain better work hardening performance by secondary aging (SG) treatment, and all samples show similar work hardening index values and form obvious “hump-shaped” structure. After the re-aging and pre-deformation aging treatment, the microstructure of the material changes obviously. Many nano-scale M carbides are precipitated in austenite to form a solid solution structure composing of austenite and M carbides, and the particle size of M carbides increases to Φ6.2 nm. However, there is a certain recovery phenomenon of the samples after SG treatment. The pre-deformation method can provide heterogeneous nucleation points for Q precipitated phase after forming defects in the alloy structure so that the precipitated phase can obtain different precipitation sites and finally achieve the effect of regulating the harmful phases. This research provides a good research direction for improving the performance of round steel for automobile lightweight.

Funds：

国家重点研发计划项目(2018YFD0800702)

作者简介：姚斌（1984-），男，硕士，工程师，E-mail：84228825@qq.com

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