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페라이트계 스테인리스강의 고온산화에 미치는 안정화원소의 영향
박수호,이용득,이윤용 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.10
A relation between metallurgical microstructure changes and oxidation resistance of 18%Cr ferritic stainless steels at the temperatures between 800 and 1050℃ has been studied. It was found that the phase structure changes during isothermal oxidation above Ac₁ temperature influerced on the oxidation resistance. In case of Fe-18%Cr steel, a thin layer of austenitic phase was produced at the beneath scale/metal interface due to the depletion of Cr by forming chromia layer during oxidation. It may generate compressive stresses on the protective scale, and so micro cracks which allow abnormal oxidation by forming nodular oxides would be developed. It results in decrease in oxidation resistance. The addition of stabilizing elements such as Ti or Nb produces fully ferritic structure up to 1000℃. It results in improvement of oxidation resistance.