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.

译文

:Fe-Mn-C-Al合金是近年来开发的TWIP钢的新钢种。它具有优异的伸长率和拉伸强度组合,以及良好的抗延迟断裂性能。但是,尚未报道这种新的TWIP钢的裂纹敏感性。在这项研究中,使用差热分析(​​DTA)方法,结合专业的热力学软件ThermoCalc分析具有不同化学成分的Fe-Mn-C-Al合金的凝固行为。基于此,进一步确定了TWIP钢的裂纹敏感性。通过这项研究,发现Fe-Mn-C-Al TWIP钢可能具有高裂纹敏感性的凝固序列,属于低晶包晶钢。此外,发现碳含量对凝固行为具有很大的影响,并且锰含量也影响凝固顺序。它可以使凝固过程的相变顺序发生显着变化,从而可以避免低包晶反应的凝固行为。热力学软件ThermoCalc的分析结果与实验结果吻合良好。它显示thermoCalc是开发Fe-Mn-C-Al TWIP钢的一种经济有效的方式。对于缩短新型Fe-Mn-C-Al钢的开发周期具有重要意义。

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