Effect of adding various metal powders respectively on properties of 316L stainless steel

MEN G Fei , GUO Shi2ju , ZHAN G Heng , YAN G Xia , GUO Lin (Powder Metallurgy Institute , University of Science and Technology Beijing , Beijing 100083 China) Abstract : Effect of various metal powders addition on the properties of 316L stainless steel was investigated. Spec2 imens containing 20 %(mass fraction) Sn , Cu , Al , respectively were sintered in a dissociated ammonia atmosphere at 1 100 ℃ temperature. Hardness , density and microstructure of the specimen were exmamined. The results re2 vealed that : 1) aluminum additions could greatly increase the compressibility of powders but the reaction of alumi2 num with stainless steel deteriorated the material property ; 2) Sn additions could enhance the hardness of 316L stainless from 75 HRB to 97. 2 HRB ; 3) copper additions led not to obvious hardness decrease. Large percentage liquid phase of 20 % low melting point metal powders additons didn’t enhance greatly the relative density of the materials. Key words : powder metallurgy ; 316L stainless steel ; liquid phase sintering


Powder metallurgy Austenitic stainless steel production is more economical, corrosion resistance, and therefore the development of faster. In order to improve the sintering density of powder metallurgy austenitic stainless steels, in order to further improve its mechanical properties and corrosion resistance, many scholars have done a lot of research on additives. Used additives are copper, silicon, tin, boron, aluminum, carbon, nickel, Cu3 P and SiC [1]. It has been reported that adding copper powder can improve the mechanical properties of stainless steel [2], but also the opposite reported [3]. The effect of adding a large amount of tin powder on the mechanical properties of stainless steel is rarely studied, mainly to study the effect of adding about 5% tin powder on the corrosion resistance of stainless steel [4]. With regard to the effect of adding aluminum on the performance of stainless steel, some conclusions at home and abroad to adjust the sintering temperature can improve the wettability of aluminum and stainless steel [5 - 6]. The authors studied the addition of 20% (mass fraction) of copper powder, aluminum powder, tin powder to 316L austenitic stainless Steel mechanical properties.