Microstructure and High Temperature Mechanical Property of Fe-Cr-B Based Metal/Ceramic Composite Manufactured by Metal Injection Molding Process

초록

This study investigated the microstructure and the room and high temperature mechanical properties of Fe-Cr-B alloy manufactured by metal injection molding. In addition, hot isostatic pressing was performed to increase the density of the material, and a comparison of properties was made. Microstructural observation confirmed a bi-continuous structure composed of a three-dimensional network of alpha-Fe phase and (Cr,Fe)(2)B phase. The HIPed specimen featured a well-formed adhesion between the alpha-Fe phase and boride, and the number of fine pores was significantly reduced. The tensile results confirmed that the HIPed specimen (RT to 900 A degrees C) had higher strengths compared to the as-sintered specimen, and the change of elongation starting from 700 A degrees C was significantly greater in the HIPed specimen. Fractography suggested that cracks propagated mostly along the interface between the alpha-Fe matrix and boride in the as-sintered specimen, while direct fracture of boride was observed in addition to interface separation in the HIPed specimen.

키워드