基于高通量热力学计算的低密度钢合金化设计

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中图分类号：U465 文献标志码：B DOI：10.19710/J.cnki.1003-8817.20250259

AlloyingDesign ofLow-Density Steel Based on High-Throughput ThermodynamicCalculations

Xin 1，2 ， ， 1， ， 1，4 （1.MaterialsAcademy，JTRI，Suzhou215ooo;2.Xi'anJiaotong-Liverpool University，Suzhou215000; 3.Suzhou University，Suzhou 215ooo;4. ， 610041）

Abstract：This study investigates thecomposition designoffullyausteniticFe-Mn-Al-C low-density steel and the effects of Nb and Mo additions on κ- carbides，based on high-throughput thermodynamic calculations.The results show thata fulyaustenitic microstructurecanbeachieved inFe-Mn-Al-C low-density steel withinthecomposition range （in mass fraction） of 12 % ～35% Mn，5%～15% Al，and 0.6%～2.5% C.Relative to the typical compositionrange， the calculatedresultsrealize densityreductionbyfurther increasing theAlcontent.Theoptimal additioncontentof Nb should beadjustedaccording totheAlcontent.MinoradditionofNb （≤1.2%in mass fraction）caninhibit the precipitation of κ -carbides through the formation of NbC phases，while maintaining a wide fully austenitic region. WhentheAl content isless than 13%in mass fraction，Mo addition（ ⩽4% in mass fraction） can increase the formation energyofK-carbides，therebysuppresing theirnucleation and growth，aswell as expanding the fullyausteniticegion and lowering its onset temperature.

Keywords：High-throughput calculation，Thermodynamic calculation，Low-density steel，Alloying design， κ -carbide

1前言

钢因其成本低、模量高、成形性与焊接性优异等优点，成为制造汽车车身结构的重要轻量化材料。（剩余11218字）