Studies on densification and strain hardening behaviour of cu sic preforms during cold upsetting

Abstract

Powder forming is a natural extension of the conventional press newlineand sinter PM process which has long been recognized as an effective newlinetechnology for producing a great variety of parts to net or nearnet shape In newlinecold upset forming of sintered powder metallurgical parts the existence of newlinefrictional constraints between the dies and the preform directly affect the newlineplastic deformation of the later one When a solid cylindrical porous preform newlineis compressed axially between the two platens the free cylindrical surface newlineundergoes heterogeneous deformation results in barrelling newlineThis thesis investigates the densification strain hardening and newlineformability behaviour of sintered copper and coppersilicon carbide powder newlinemetallurgy cylindrical preforms newline newline