Alloy composition and process design based on thermodynamic and kinetic simulation: The case of medium Mn steel |
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| Affiliation: | 1. School of Materials and Metallurgy, Inner Mongolia University of Science &Technology, Baotou, 014010, Inner Mongolia, China;2. Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources, School of Materials and Metallurgy, Inner Mongolia University of Science &Technology, Baotou, 014010, Inner Mongolia, China;1. State Key Laboratory of Advanced Special Steels, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, PR China;2. Ansteel Group Beijing Research Institute Co., Ltd, Beijing, 102211, PR China;3. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, PR China |
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| Abstract: | This paper presents a design method for alloy materials that can be applied to medium Mn steel containing Al and/or Si. By using thermodynamic calculations based on CALPHAD, a wide range of alloy composition spaces were systematically studied, and the relationship between retained austenite fraction and its stability with intercritical annealing temperature was investigated. Alloys that meet the Process Window (PW) were screened and their various characteristics of alloy elements within the process window were determined. Additionally, the study performs three different kinetic simulations of austenite growth and solute partitioning during isothermal annealing on alloys that meet PW. The prediction of the model is verified by comparing with the experimental data in the literature. The results show that the remote model is more suitable for the actual production of low temperature isothermal intercritical annealing. Therefore, the method provided in this work makes a guiding contribution to alloy development, which can determine the alloy composition and heat treatment process satisfying PW and optimize the overall properties. |
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| Keywords: | Medium-Mn steel Thermodynamic calculation Retained austenite Dynamics Phase transformation |
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