A MODEL FOR THE MECHANICAL-PROPERTIES OF HOT ISOSTATICALLY PRESSED RAPIDLY SOLIDIFIED STAINLESS-STEEL POWDER

An attempt has been made to correlate the relative tensile strength an d relative density of HIPed 304 stainless-steel powder by faking into account the stress-concentration effect of pores. The stress-concentra tion factor of the pores is a function of relative density and pore-sh ape. A reduction of the stress-concentration factor occurs during tens ile deformation because of plastic zone blunting of sharp-angled inter stices. This reduction is related to the third power of the ratio of t he pore radius to the neck radius. Relative strength values have posit ive deviations from our calculated strength-density curves. These devi ations decrease as the density increases and more so for finer powders . The temperature of the HIPing process is the most dominant parameter for the strength of HIPed 304 stainless-steel powder