アトマイズ法により作製された亜共晶Fe-C系鋳鉄粉末の真空焼結特性 Vacuum Sintering Behavior of Atomized Cast-iron Powder of Fe-C System Containing Hypo-eutectic Carbon
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:<BR>(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.<BR>(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.<BR>(3) As sintering temperature was higher, microstructure of sintered body changed in the following sequence, (ferrite + free Fe<SUB>3</SUB>C), (ferrite + pearlite + free Fe<SUB>3</SUB>C), (pearlite + free Fe<SUB>3</SUB>C). No graphite in sintered body under sintering condition of this study was observedby means of optical microscope.
粉体および粉末冶金 44(6), 590-595, 1997-06-15
Japan Society of Powder and Powder Metallurgy