Abstract
The effect of pre-deformation on the precipitation behavior of the β-Mn phase while aging at 600 °C was investigated in Fe–30Mn–9Al–1C (wt pct) steel. The accelerated precipitation and growth of the β-Mn phase along the grain boundaries and deformation bands are ascribed to variations in the microstructure and storage energy. The precipitation kinetics of the β-Mn phase can be restrained using the Johnson–Mehl–Avrami model. The high storage energy level resulting from the pre-deformation facilitates the nucleation of the β-Mn phase. The characteristics of the grain boundaries and deformation bands as a channel for rapid diffusion of the solute atoms is beneficial for the growth of the β-Mn phase. In addition, the existence of intergranular κ-carbides causes the β-Mn phase to precipitate earlier than α-ferrite during the aging treatment. Finally, the precipitation of the β-Mn phase increases the hardness but dramatically reduces the plasticity.
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Acknowledgments
The above study was supported by the National Natural Science Foundation of China (Grant No. 51374151), the Key Scientific Research Project in Shanxi Province (Grant Nos. MC2014-03, MC2016-06, and 201603D111004), the Research Project Supported by the Shanxi Scholarship Council of China (2017-029), and the Patent Promotion and Implement Found of Shanxi Province (20171003).
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Manuscript submitted September 18, 2018.
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Xing, J., Hou, L., Du, H. et al. Effects of Pre-deformation on the Kinetics of β-Mn Phase Precipitation and Mechanical Properties in Fe–30Mn–9Al–1C Lightweight Steel. Metall Mater Trans A 50, 2629–2639 (2019). https://doi.org/10.1007/s11661-019-05173-5
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DOI: https://doi.org/10.1007/s11661-019-05173-5