The influence of hydrostatic pressure on the flow stress and ductility of a spherodized 1045 steel

The flow stress of a spheroidized 1045 steel was found to increase linearly with superimposed hydrostatic pressure in accord with published results on other iron-based materials. The nucleation and growth of voids at carbide particles was severely retarded by the superposition of pressure. In tests conducted under constant pressure, the final fracture strain was observed to increase linearly with pressure and the dimple size on the fracture surface to decrease linearly with pressure. Metallographic studies have been performed to determine the influence of pressure on damage accumulation. In interrupted tests where pressure was applied after a prestrain of 0.9 without pressure, the ductility was increased to values similar to those achieved in specimens deformed continuously under pressure.