Microstructure and Properties of Gray Cast Iron after Hot Deformation
Gray cast iron was compressed by cylinder covered compression(CCC) process on a Gleeble 3500 machine.The specimens after graphitization treatment were characterized by using optical microscope and image analyzer.The micro hardness and tensile tests at ambient temperature were carried out.The fracture surface of tensile specimens was observed by using scanning electron microscope.The results show that a lamellar microstructure of graphite and steel matrix forms in the 80% deformed specimens and results in lamella fracture surface;its tensile strength,total elongation and micro hardness is 249 MPa,5.2% and 217HV,respectively.