한국기계연구소 소보

Korea Institute of Machinery & Materials (한국기계연구원)
권호 표지

A study on Mechanical and Fatigue Properties of Spheroidal Graphite Cast Iron

구상흑연주철의 기계적 성질및 피로특성에 관한 연구

  • 박노광 (한국기계연구원 창원본소 소재개발실) ;
  • 김창주 (한국기계연구원 창원본소 소재개발실) ;
  • 전의진 (한국기계연구원 창원본소 소재개발실)
  • Published : 1982.10.15
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Abstract

The influence of different heat treatment conditions on microstructure, mechanical and fatigue properties of Spheroidal Graphite cast Iron with 0.4-0.6% Mn was investigated. 1) Maximum tensile strength was arrived by tempering at about $450^{\circ}C$after quenching. Tempering at higher than $600^{\circ}C$ was changed martensitic structure to ferritic structure and secondary graphites were precipitated. 2) The relationship between matrix hardness and total hardness of the specimens are as following. [HB]$T$=0.7[HB] [HB]$M$+35 Maximum tensile strength was arrived at the total hardness of HB400-450. 3) Endurance ratio decreases with increasing total hardness, and fatigue limits can be presumed from as following. $\sigmaf$=$\sigmat$

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