Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2014 - zeszyt 2

Application of image analysis to porosity investigation into sintered copperalloying AISI 410L stainless steels

nr katalogowy: 84306

It is known that stainless steels are one of the most important group of materials. Their importance is confirmed by the range of applications - products made of stainless steels. Currently steady growth of demand for stainless steels can be noticed [1], also for produced by powder metallurgy technology. Nowadays there are hundreds grades of commercially available stainless steels [2]. Many of them can be manufactured by using conventional water atomization powder and press and sinter processes. Powder metallurgy provides considerable opportunities to obtain a wide range of properties and corrosion resistance in sintered stainless steels. There are a lot of applications which required the stainless steels with high strength and good corrosion resistance. In the case of high strength and hardness requirements, graphite addition can be introduced to AISI 410L or more highly alloyed materials, such as precipitation hardening stainless steel, where 17-4 PH grade can be applied. The use of increased levels of alloying elements in sintered stainless steels (produced by powder metallurgy) is both costly and counter-productive due to the negative effect on compressibility. Graphite is added to ferritic grade of steel to promote formation of martensite. Usage of graphite addition into AISI 410L powder increases the strength and hardness of sintered steel. Beside, AISI 410L powder with graphite addition has high compressibility, so the sintered density of this material is also high and properties are satisfactory. But, on the other hand, graphite addition requires strict control of atmosphere in sintering furnace in order to achieve consistent carbon levels. Disadvantage of graphite usage is also its negative influence on corrosion resistant of stainless steels [2÷5]. In this case, introduction of copper to the AISI 410L stainless steel is an alternative solution. Copper increases corrosion resistance, while providing solid solution st[...]

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