Influence of ferrite and pearlite content on mechanical properties of ductile cast irons

摘要

The present work is to study the influence of ferrite and pearlite content on mechanical properties of ductile cast irons. Three casts with different microstructures were produced. The chemical composition of the casts was also considered. The pearlite content is varied from 0 to about 70 percent without using heat treatments. This paper also shows that is possible to obtain different microstructures with good mechanical properties through an adequate balance of alloying elements. The study of the tensile properties indicated that yield and tensile strengths are increased with increasing pearlite content. This analysis also shows that graphite shapes and the second phase particles found to have influence on these parameters. With this purpose an extensive study was also done on mechanical properties to achieve good results. Specimens were under different mechanical tests such as fracture toughness and tensile strength tests. The Charpy impact tests were done at different temperatures.