B7B4내열강의 고온산화 및 내식성에 관한 연구

Abstract

To obtain the fundamental data by the oxidation tests for the heat-resistant steels that have different microstructures which are martensite and ferrite. The present authors have investigated the effect in different high temperature and different environments. After the oxidation test, the specimens were observed by SEM, tested by XRD. The result of high temperature oxidation test was revealed that the martensitic-ferritic heat-resistant steel shows better value than the martensitic heat-resistant steel. The oxides from the surface of specimens shows that the grain size of the oxides grow bigger with the rise of temperature and the increase of the time. In the results of XRD about the oxidation specimens, the main surface resultants of these materials were Cr-oxide. The result of corrosion resistance shows that the martensitic-ferritic has relatively corrosion resistance.