OS0704 Fracture Toughness and Fatigue Crack Propagation Behaviour of Hot Isostatically Pressed Cast Iron with Spheroidal Carbides Dispersed within Martensitic Matrix Microstructure

Abstract

Fracture toughness and fatigue crack propagation (FCP) have been studied using compact tension (CT) specimens of as-cast and HIPed cast iron with spheroidal vanadium carbides (VCs) dispersed in martensitic matrix microstnicture. The Vickers hardness of the HIPed material was higher than that of the as-cast one due to lower retained austenite phase. The HIPed material exhibited lower fracture toughness than the as-cast material, while the intrinsic FCP resistances were nearly the same between those two materials.