| The relation between strength and second phase volume fraction in two-phase iron alloys was investigated. The alloys used in this study were classified into two groups; one was Fe-C alloy system composed of ferrite, and martensite, and the other was Fe-Ni-C alloy composed of austenite and martensite. The relation between strength and second phase volume fraction in two-phase iron alloys was better represented by rule of mixture, as the ratio of strength of second phase to that of matrix became smaller. As the strength ratio became larger, the relation between strength and second phase volume fraction deviated more from the linear relationship expressed by the rule of mixture. This may be caused by the difference in strain between the second phase and the matrix, which becomes larger with an increase of the strength ratio. |
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