High Silicon Ductile Iron: Possible Uses in the Production of Parts with ^|^ldquo;Dual Phase ADI^|^rdquo; Microstructure

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  • Basso Alejandro
    Graduate Student, Faculty of Engineering, INTEMA, National University of Mar del Plata
  • Caldera Martín
    Graduate Student, Faculty of Engineering, INTEMA, National University of Mar del Plata
  • Rivera Graciela
    Graduate Student, Faculty of Engineering, INTEMA, National University of Mar del Plata
  • Sikora Jorge
    Faculty of Engineering, INTEMA, National University of Mar del Plata

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  • High Silicon Ductile Iron: Possible Uses in the Production of Parts with “Dual Phase ADI” Microstructure

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The aim of this paper is to study the advantages and disadvantages of using high silicon ductile iron to produce cast parts with “Dual Phase ADI” microstructure. In this study, four ductile irons with different percentages of silicon: 2.4, 3.1, 3.5, and 4.2%, respectively, were used. Samples from each cast were subjected to heat treatment in order to determine the intercritical interval. Significant increase in the upper and lower critical temperatures was found as the amount of silicon incremented. However, the difference between the lower and upper critical temperatures (intercritical interval amplitude) remained nearly constant for all ductile irons.<br> The materials were metallographically and mechanically characterized in the as-cast conditions and after full annealing heat treatments. Tensile, hardness and impact properties were determined as a function of the silicon level.<br> The results suggest that high silicon ductile iron (Si content ranging from 3.0 to 3.6%) can be used in the manufacture of cast parts with “Dual Phase ADI” microstructures, yielding undeniable advantages in the production process if compared to low and medium silicon ductile irons.

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