Indexed on: 01 Jul '89Published on: 01 Jul '89Published in: Journal of Materials Science
Results of an investigation of the influence of carbon and silicon content on tensile properties of ferritic compacted graphite cast irons from room temperature to 500° C are presented. The tensile flow stress plateau of ferritic compacted graphite cast irons occurs owing to dynamic strain ageing from 200 to 400° C with various carbon and silicon contents. Because the ferritic compacted graphite cast irons have irregularly shaped graphite particles, their fracture mechanism is attributed to a mixed fracture mode. With increasing silicon content, the fracture mechanism changes from dimple pattern to transgranular cleavage at room temperature. However, when the test temperature is above the raised transition temperature the specimens fail in ductile manner.