This work focuses on fundamental understanding of microstructure evolution of nanostructured ferritic alloy (NFA) and 25 vol.% Cr₃C₂ coated SiC(Cr₃C₂@SiC)-NFA composite during spark plasma sintering at 950 °C and the following thermal treatment at 1000 °C. A unique bi-phase microstructure with distinct Cr-rich and Si-rich phases has been observed for the 25 vol.% Cr₃C₂@SiC-NFA composite, while for the NFA sample, the traditional large grain microstructure remains. Grain sizes are significantly smaller for the 25 vol.% Cr₃C₂@SiC-NFA composite compared to those for the pure NFA, which can be attributed to the presence of grain boundary phases in the composite sample. During the thermal treatment, microstructure features can be directly correlated with the dissolution kinetics and phase diagrams calculated using Thermo-Calc/DICTRA/PRISMA®.

这项工作的重点是对在950°C的火花等离子体烧结及随后的热过程中纳米结构铁素体合金（NFA）和25％（体积）Cr ₃ C ₂涂层SiC（Cr ₃ C ₂ @SiC）-NFA复合材料的微观结构演变的基本理解。在1000°C下处理。对于25％（体积）的Cr ₃ C ₂ @ SiC-NFA复合材料，观察到具有独特的富Cr和富Si相的独特双相微观结构，而对于NFA样品，则保留了传统的大晶粒微观结构。25％（体积）Cr ₃ C _2的晶粒尺寸明显较小@ SiC-NFA复合材料与纯NFA相比，可以归因于复合材料样品中存在晶界相。在热处理过程中，可以将微观结构特征与使用Thermo-Calc / DICTRA /PRISMA®计算的溶解动力学和相图直接相关。