Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Martensite on the Mechanical Properties of Austempered Ductile Cast Iron with Cu

Cu를 갖는 오스템퍼드 구상흑연주철의 기계적 성질에 미치는 마르텐사이트의 영향

  • Kang, C.Y. (Divi. of Mat. Sci. and Eng., Pukyong National Univ.) ;
  • Lee, J.M. (Divi. of Mat. Sci. and Eng., Pukyong National Univ.) ;
  • Soon, D.W. (Daegu Polytechnic College) ;
  • Kwoon, S.K. (Daegu Polytechnic College) ;
  • Kim, I.S. (Divi. of Met. and Mat. Eng., Chonbuk National Univ.) ;
  • Sung, J.H. (Dep. of Met. and Eng., Dong-A Univ.)
  • 강창룡 (부경대학교 공과대학 재료공학부) ;
  • 이종문 (부경대학교 공과대학 재료공학부) ;
  • 손동욱 (대구기능대학) ;
  • 권성겸 (대구기능대학) ;
  • 김익수 (전북대학교 신소재공학부) ;
  • 성장현 (동아대학교 공과대학 금속공학과)
  • Received : 2002.09.05
  • Published : 2002.11.30
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Abstract

Effect of martensite on the mechanical properties of austempered ductile cast iron was investigated after obtained the martensite by subzero treatment. Retained austenite was transformed to martensite by subzero treatment, and with decreasing subzero treatment temperature, volume fraction of martensite was increased. With increasing of the volume fraction of martensite, tensile strength was increased and elongation was decreased, ratio of increasing of strength and decreasing of elongation was higher in case of specimens with lot's of Cu contents. With increasing of the volume fraction of martensite, hardness slowly increased until only about 5% and it rapidly increased in a straight proportion when it is above 5%, while impact value was rapidly decreased until about 7% but it had a little change when it is above 7%.

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