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EFFECT OF VARYING AUSTEMPERING TIME AND TEMPERATURE ON THE MECHANICAL PROPERTIES OF SPHEROIDAL CAST IRON

Pravinraj.EL, Manjinder Bajwa, Mahipal Singh

The spheroidal graphite iron (ductile iron) is known for its good elongation (ductility) property at casting process at the part of low tensile strength. If the SGI is to produce good tensile strength, the elongation is gradually decreases. So an experimental research was conducted by chemical composition (high percentage of Cu) to improve the tensile strength, hardness as well as elongation together with the variation of austempering temperature and different time period. The variables, austempering temperature were varied from 2500 C to 3000 C and for holding time period of 10, 20 and 30 minutes. The results of experiments showed that with an increase of austempering temperature and time, the tensile strength and hardness decreases whereas the elongation increases.