Abstract
Stainless steel powder metallurgical (P/M) parts are becoming more and more important in hightechnological areas. Among all the stainless steels, austenitic grades are the most widely used, with 316L alone accounting for more than one-third of all the stainless steel powders [1]. Components made of straight 316L stainless steel powder have good mechanical strength and appearance plus wear and corrosion resistance; its strength may be further increased by incorporating hard particles [2, 3]. Some authors [4, 5] have reported an increase in tensile strengths of sintered straight 316L stainless steel sintered from 30 min to 3 h. The highest tensile strength and yield strength of 415 and 300MPa, respectively, were obtained by sintering 316L stainless steel powder compacts for 120min at 1065°C in dissociated ammonia at a green compact density of 6.85Mgm 3. Yield strength was found to show a faster rising trend at a comparatively lower sintering temperature. Stosuy and Holmes [4] found an increase in ductility and shrinkage with increasing sintering time. In addition,
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