Microstructural Evolution of Gas Atomized Fe-25Cr-3.2C Alloy Powders  

作　　者：YANG Min SONG Chang-jiang DAI Yong-xiang ZHU Liang LI Ke-feng ZHAI Qi-jie 

机构地区：[1]Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, China

出　　处：《Journal of Iron and Steel Research International》2011年第2期75-78,共4页

基　　金：Item Sponsored by National Natural Science Foundation of China (50701030);National Basic Research Program of China(2010CB630802)

摘　　要：The microstructural evolution of the gas atomized Fe-25Cr-3.2C powders was investigated by using optical microscope, scanning electron microscope, and X-ray diffraction. The experimental results showed that the atomized Fe-25Cr-3.2C powders were mainly composed of austenite and （Fe,Cr）7 C3 carbide. Eutectic microstructure was developed in the larger particles, whereas dendritic microstrueture was obtained in the particles with diameter less than 38 μm. The reason for microstructure change should be the difference of nucleation undercooling for particles.The microstructural evolution of the gas atomized Fe-25Cr-3.2C powders was investigated by using optical microscope, scanning electron microscope, and X-ray diffraction. The experimental results showed that the atomized Fe-25Cr-3.2C powders were mainly composed of austenite and （Fe,Cr）7 C3 carbide. Eutectic microstructure was developed in the larger particles, whereas dendritic microstrueture was obtained in the particles with diameter less than 38 μm. The reason for microstructure change should be the difference of nucleation undercooling for particles.

关 键 词：gas atomization Fe-Cr-C alloy microstructure UNDERCOOLING rapid solidification 

分 类 号：TF[冶金工程]