용융가압함침 공정으로 제조된 고체적률 TiC–Inconel 718 금속복합재료의 미세조직 및 특성
Microstructure and Properties of TiC-Inconel 718 Metal Matrix Composites Fabricated by Liquid Pressing Infiltration Process
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초록
본 연구에서는 용융가압함침 공정을 이용하여 고체적률의 TiC 입자가 균일 분산된 Inconel718 금속복합재료를 제조하고, 미세조직 및 기계적 특성을 분석하였다. 약 55 vol%의 TiC가 균일하게 분산된 TiC/Inconel718 복합재료를 제조함으로써 Inconel718 대비 우수한 경도 및 압축강도 특성을 나타내었으며, 이는 기지에 고용된 합금원소인 Mo 및 Nb이 TiC 강화재 내부로 확산·고용되어 우수한 계면 특성을 가지는 core-rim 구조의 TiC 형성에 의한 것으로 판단된다.
Abstract
Titanium carbide (TiC) reinforced Inconel718 matrix composites were successfully fabricated by a novel liquid pressing infiltration process. Microstructure and mechanical properties of the fabricated 55 vol% TiC–Inconel718 composite are analyzed. The composite exhibits superior mechanical properties, such as hardness and compressive strength as compared with Inconel718. It is believed that Mo and Nb, which are alloying elements in the matrix, diffuse and solidify into the TiC reinforcement, resulting in generation of core-rim structure with excellent interfacial properties.
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