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γ와 α` 2상 조직을 갖는 202 스테인리스강의균일부식에 미치는 γ의 영향
강창룡 ( C. Y. Kang ),김영화 ( Y. H. Kim ),허성화 ( S. H. Heo ),김성희 ( S. H. Kim ),이상환 ( S. H. Lee ) 한국열처리공학회 2015 熱處理工學會誌 Vol.28 No.4
Effects of austenite on the uniform corrosion in the solution of 1 N H2SO4 were investigated through the electrochemical polarization test. Two phases structures of martensite and austenite were obtained by annealing treatment at the range of 500℃~700℃ for 10min. in 70% cold- rolled 202 stainless steel. Volume fraction of reversed austenite increased rapidly with an increase of annealing temperature. Uniform Corrosion was occur mainly on martensite phase in 202 austenitic stainless steel with two phase of austenite and martensite. Corrosion current density increased with an increase of volume fraction of austenite, therefore uniform corrosion was affected by volume fraction of austenite