كليدواژه :
microstructure , Aluminium , Nodular Graphite Cast Iron , جدايش ميكروسكوپي , Austenite , ريزساختار , Microsegregation , آلومينيم , سيليسيم , Silicon , مهندسي , آستنيت , چدن يا گرافيت كروي
چكيده لاتين :
The microsegregation pattern of aluminium and silicon in the nodular cast irons has been investigated Microscopic analysis by EDX and EPMA indicates that there is inhomogeneity in the matrix of the as-cast experimental irons. Al is enriched at areas close to the graphite nodules, whereas the concentration of silicon is higher in the Intercellular regions. Furthermore, the results obtained on the ausienitised Al-alloyed ductile irons at 920 C at different holding times indicate that austenitising reduces the inhomogeneity of the as-cast microstructure and that after sufficient holding time, the matrix of Al-alloyed ductile irons containing different AI concentrations can be virtually segregation free.
