Abstract
Fe-Mn-C-Al alloy is a new steel grade of TWIP steel developed in recent years. It has an excellent combination of elongation and tensile strength, as well as good anti-delayed fracture property. However, the crack sensitivity of this new TWIP steel has not been reported yet. In this study, differential thermal analysis (DTA) method was used, combined with professional thermodynamic software ThermoCalc to analyze the solidification behavior for Fe-Mn-C-Al alloys with different chemical compositions. Based on this, the crack sensitivity of TWIP steel is further determined. Through this study, it was found that Fe-Mn-C-Al TWIP steel may have a solidification sequence with high crack sensitivity, belonging to hypo-peritectic steel. Moreover, it was found that the carbon content has a large influence on the solidification behavior, and the manganese content also affects the solidification sequence. It can make the phase transition sequence of the solidification process change significantly, which may avoid the solidification behavior of hypo-peritectic reaction. The analysis results by thermodynamic software ThermoCalc are in good agreement with the experimental results. It displays thermoCalc can be a cost-effective way to develop Fe-Mn-C-Al TWIP steel. It is of great significance for shortening the development period of new Fe-Mn-C-Al steel grades.
Highlights
Fe-Mn-C-Al alloy is a new steel grade of Twinning-induced plasticity (TWIP) steel developed in recent years
Due to the composition design of the new TWIP steel, this alloy may be in the range of hypo-peritectic reaction, which may undergo a peritectic transformation and prone to cause cracks and defects; this type of steel with high crack susceptibility can be classified into hypo-peritectic steel
The results show that the solidification behavior of Fe-Mn-C-Al TWIP steel may be hypo-peritectic steel
Summary
Fe-Mn-C-Al alloy is a new steel grade of TWIP steel developed in recent years. It has an excellent combination of elongation and tensile strength, as well as good anti-delayed fracture property. Differential thermal analysis (DTA) experiments combined with the thermodynamic software ThermoCalc were performed to analyze TWIP steel with different chemical compositions, and to determine the solidification behavior at high temperatures. It is analyzed whether the TWIP steel with different compositions belongs to the critical range with high crack sensitivity.
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