بهينه نمودن شرايط عمليات حرارتي آستمپرينگ چدن نشكن همگن شده توسط عمليات حرارتي همگن سازي از طريق ذوب جزيي

The effect of preheat treatment homogenization via partial melting on the ductility of ADI

Combination of optimal mechanical properties, easy casting and economical costs and so on introduces ductile iron (D.I.) as an important industrial material. One of the most problems during casting of D.I. is micro-segregation of alloying elements that reduces the mechanical properties and efficiency of austempering heat treatment considerably. In the present investigation unlike previous researches homogenization using partial melting (HPM) was carried out. Microstructural observation via optical microscopy and chemical composition scanning through EDS-SEM revealed that HPM is more effective than conventional homogenizing heat treatment in homogenized alloying elements distribution in D.I. matrix. Mechanical properties investigation of homogenized using partial melting and austempered ductile iron showed that optimal combination of HPM and austempering thermal condition can improve ductility of ADI that is important industrially