Journal of Materials Science

, Volume 27, Issue 16, pp 4323–4328 | Cite as

Temperature dependence of tensile strength and hardness for nodular cast iron and their mutual correlation

  • Sahachiro Kogoh
  • Tatsuo Sakai
  • Katsutoshi Asami


Nodular cast iron has mechanical properties which make it superior to relatively brittle pig cast iron. As a matter of fact, by using appropriate heat treatment processes, the tensile strength of nodular cast iron can be improved to such a degree that its hardness corresponds to that of carbon steels. The main aims in this study are to find the most preferable heat treatment conditions which will yield high strength levels, and to clarify the temperature dependence of mechanical properties for nodular cast iron. The estimation of tensile strength from hardness is also discussed, since tensile tests at elevated temperatures are usually more expensive and time consuming than the hardness tests. Nodular cast irons, having four different microstructures were first prepared by performing the following heat treatments: (1) as-cast, (2) annealed, (3) normalized and (4) bainitized. Tensile property and hardness were then measured for the respective cast irons under elevated temperatures. The temperature dependence of the tensile strength as well as hardness was investigated. It was found that the dependence was well represented by an expression of σ=σ0exp(−BT). Thus results were discussed from a view-point of the reaction rate process. The correlation between tensile strength and hardness was also examined and a significant linearity was found between them. Based on this strict correlation, an estimation procedure of the tensile strength was finally proposed.


Heat Treatment Tensile Strength Tensile Test Carbon Steel Tensile Property 
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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • Sahachiro Kogoh
    • 1
  • Tatsuo Sakai
    • 2
  • Katsutoshi Asami
    • 3
  1. 1.Saitama Prefectural Casting and Machinery Research InstituteSaitamaJapan
  2. 2.Faculty of Science and EngineeringRitsumeikan UniversityKyotoJapan
  3. 3.Musashi Institute of TechnologyTokyoJapan

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