Influence of Niobium additions on sintering behaviors and mechanical properties of injection molded 420 stainless steel powder
This paper describes the sintering of an injection molded 420 martensitic stainless steel with additions of niobium, with the aim of producing high mechanical properties. And at the same time, microstructural and mechanical characterization of these produced parts was also carried out. At the initial stage, 420 martensitic stainless-steel powders were mixed with a multi-component binder system for preparing feedstock. Then the prepared feedstock was granulated and shaped by injection molding. And then, the shaped samples were subjected to the debinding process. These samples were sintered at different temperatures for various times. Samples sintered under the condition that gave way to the highest relative density were heat treated. Sintered and heat-treated samples were separately subjected to microstructural and mechanical characterization. All analysis showed that using polymeric binder system led to plentiful martensite ratio and carbide precipitates to be occurred in the injection molded samples. Mechanical characterization was performed by hardness measurements and tensile tests.
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