Microstructure evolution of nanostructured ferritic alloy with and without Cr3C2c oated SiC at high temperatures  

作　　者：Kaustubh Bawane Kathy Lu 

机构地区：[1]Department of Materials Science and Engineering,Virginia Polytechnic Institute and State University,Blacksburg,VA 24061,USA

出　　处：《Journal of Materials Science & Technology》2020年第8期126-134,共9页材料科学技术（英文版）

基　　金：supported financially by the Office of Nuclear Energy of Department of Energy(No.#DE-NE0008264)。

摘　　要：This work focuses on fundamental understanding of microstructure evolution of nanostructured ferritic alloy(NFA) and 25 vol.% Cr3C2 coated Si C(Cr3C2@Si C)-NFA composite during spark plasma sintering at950°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@Si C-NFA composite, while for the NFA sample, the traditional large grain microstructure remains. Grain sizes are significantly smaller for the25 vol.% Cr3C2@Si C-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~?.

关 键 词：Cr3C2 coated SiC Nanostructured ferritic alloy Thermal treatment M7C3 precipitate Thermo-Cale simulation Metal matrix composites 

分 类 号：TB33[一般工业技术—材料科学与工程]