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원심주조법으로 제조된 10% Cr 내열강의 등온 변태 거동
김주업 ( J E Kim ),이종훈 ( J H Lee ),김두현 ( D H Kim ),유위도 ( W D Yoo ),이재현 ( J H Lee ) 한국열처리공학회 2014 熱處理工學會誌 Vol.27 No.2
Isothermal transformation behavior of a 10% Cr heat resistant steel fabricated by centrifugal casting process was investigated. Normalized specimen at 1100oC for 1 hour was isothermally annealed at temperature range between 600oC and 700oC with various time. The annealed specimen had eutectoid structure which was generated along austenitic grain boundary during isothermal annealing. Areal fraction of eutectoid structure increased up to 25% after holding at 700oC for 20 hours. It was observed that austenitic matrix was transformed to ferrite structure and fine M23C6 carbides with increase of annealing time. Time-temperature-transformation diagram of the centrifugally cast 10% Cr steel with 0.18 wt% C was plotted based on the results of isothermal transformation behavior.