The Effect of Nearly Full Theoretical Density on Critical Performance for Stainless Steel Powder Metal

The effect of high density on critical performance properties for stainless steel powder metal (P/M) has been studied. Sinter-Hot Isostatic Pressing (HIP) cycles were optimized to yield stainless steel P/M samples with density levels of 94% to 98% of theoretical density. These samples were then tested for corrosion resistance, stress-rupture strength, tensile strength and toughness. Conventional-density stainless steel P/M samples and wrought samples, when possible, were tested simultaneously to provide a direct comparison.

The high density stainless steel P/M samples consistently perform better than those at conventional density levels and exhibit properties that are very close to those of wrought material.