Abstract
We studied vaccum sintering behavior of an atomized cast-iron powder of two Fe-C systems containing hypo-eutectic carbon and the microstructures of sintered bodies. The results were as follows:
(1) Sintering of atomized cast-iron powder rapidly progressed independent of carbon contents within a temperature range from about 1090 to about 1110°C. This temperature range was narrow in comparison with temperature deviation in isothermal state of actual vaccum sintering furnace. Therefore, the porosity controll in vaccum sintering was very difficult in order to obtain porous sintered body.
(2) In more detail, at a same sintering temperature, sintered body of 3.96 mass% C powder was more dense than that of 2.46 mass% C powder.
(3) As sintering temperature was higher, microstructure of sintered body changed in the following sequence, (ferrite + free Fe3C), (ferrite + pearlite + free Fe3C), (pearlite + free Fe3C). No graphite in sintered body under sintering condition of this study was observedby means of optical microscope.
