Abstract
Control of carbon content in sintering process was studied in order to get the efficiency and the utility in the the metal injection molding process of structural alloy steel.After debinding the injection molded bodies of chromium molybdenum steel(SCM440) powder, the carbon content of the specimens was controlled by flowing hydrogen or hydrogenmethane mixture in the sintering process where the flow rate of gasses was regulated by mass flow and program controllers.As a result, the carbon content of the sintered bodies was almost proportional to the ratio of methane to hydrogen gas in the carburization at 1000°C, and the carbon distribution in the sintered bodies could be also controlled by adequate selection of conditions(time, flowing rate etc.)of flowing methane.
