Pulse electric current sintering behavior of atomized cast-iron powder of Fe-C system containing hypo-eutectic carbon (III) --Mechanical properties of atomized cast-iron porous sintered body

摘要

The relationships between the bending strength and the relative density in the atomized cast-ironporous sintered bodies, which were made by the vacuum sintering method and the pulse electriccurrent sintering method, were studied. The results were as follows:(1) In the vacuum sintered body, the bending strength depended on the carbon content of powder.The bending strength of both the relative density over 65% of Fe-2.46mass%C compact and therelative density over 90% of Fe-3.96mass%C compact were dependent on the particle size, and thebending strength of the sintered body made from small size powder was larger than that of made fromlarge size powder.(2) In the pulse electric current sintered body, the bending strength did not depend on the particlesize, the carbon content and the sintering condition.(3) In the relative density range from 60% to 90%, the bending strength of the vacuum sinteredbody was larger than that of the pulse electric current sintered body. Over the relative density 90%,the bending strength of the pulse electric current sintered body was larger than that of the vacuumsintered body. In the low relative density range (60~90%), the bending strength was affected by thepore shape. However, in the high relative density range (90%~), the bending strength was influencedby the size of Fe{sub}3C.