650 ℃의 N2-O2-CO2 가스환경 하에서 Fe-1.5Cr-0.5Mo 강의 산화 및 기계적 물성치에 미치는 KCl 침적의 영향
Effect of KCl deposition on oxidation and mechanical properties of Fe-1.5Cr-0.5Mo steel in N2-O2-CO2 gas environment at 650 °C
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초록
본 연구에서는 표면 KCl 침적에 의한 Fe-1.5Cr-0.5Mo 강의 산화 및 강도저하를 평가하기 위해 650 ℃의N2-10%O2-10%CO2 가스환경 하에서 등온산화실험을 실시하였다. 산화특성은 무게 증가량, 주사전자현미경, 에너지 분산형 X선 분광기를 이용하여 실시하였으며, 표면 산화에 따른 강도저하 평가는 인장실험을 통해 실시하였다. KCl에 침적된 시편에서는 미 침적 시편 대비 Fe2O3/ Fe3O4/ FeO 구조를 가진 다공성의 산화층이 약 3배 이상 두껍게 형성되었다. 인장 및 항복강도는 산화물 형성에 기인한 단면적 감소에 비례하여 저하되는 경향을 나타냈다.
Abstract
In this study, an isothermal oxidation experiment was conducted to investigate the effect of KCl deposition on the oxidation and strength degradation characteristics of Fe-1.5Cr-0.5Mo steel in N2-10%O2-10%CO2 gas environment at 650 °C. The oxidation properties were characterized by weight gain, scanning electron microscopy, and energy dispersive X-ray spectroscopy. The strength degradation by surface oxidation was evaluated via a tensile test. In the specimens with deposited KCl, a porous oxide layer with the Fe2O3/ Fe3O4/ FeO structure was formed, and was approximately thrice thicker than the un-deposited specimens. The tensile and yield strengths showed a tendency to decrease in proportion to the reduction in cross-sectional area due to the formation of the oxide.
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