Tensile Deformation Behaviors of Pressurized Iron and Steel

Abstract

Deformation behaviors of a commercially pure iron and a mild steel pressurized at hydrostatic pressures up to 880 MPa were examined mainly to establish a method for evaluation of the effect of pressure on the deformability encountered in some metal-formings such as explosive ones in which the work-piece is subjected to a rapid deformarion under a high pressure of short duration.
Pressurization, which did not affect the fracture elongation in a quasi-static tension, sometimes caused a considerable increase of the elongation in an impact tension. This effect is attributed to an increase of the critical impact tensile speed through the lowering of yield stress. The above experiment has proposed how to evaluate the effect of pressure on the workability found in a forming such as an explosive one.
In addition to the tensile ductility of pressurized specimens, the effects of grain size and ageing on the yield stress of pressurized specimens are also described in the present paper.