Effects of Pre-deformation on the Kinetics of β-Mn Phase Precipitation and Mechanical Properties in Fe–30Mn–9Al–1C Lightweight Steel
- 29 Downloads
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.
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).