MIM法で作製したSCM415鋼のC含有量と機械的性質に及ぼす作製条件の影響 Effect of Process Conditions on the C Content and Mechanical Properties of SCM415 Steels Produced by MIM
Metal injection molding (MIM) process for the SCM415 steel powder (water atomized, 8.3μm) has been performed paying most attention to keep the desirable carbon level in the sintered compacts. 0.4mass% graphite was added to the powder to control the C content. After debinding in air at temperatures ranging from 513K to 553, the compacts were sintered at 1548K for l8ks in H<SUB>2</SUB> and N<SUB>2</SUB> gas mixtures.<BR>The carbon contents of MIM sintered compacts decreased with the increase of debinding temperature, and the debound compact at 553K showed almost 0 mass%, regardless of the sintering atmosphere. The maximum carbon content was obtained by sintering in 10vol% H<SUB>2</SUB>/N<SUB>2</SUB>, and the carbon content decreased with increasing H<SUB>2</SUB> concentration. By sintering in pure H<SUB>2</SUB>, the carbon contents were closed to 0 mass% in all the compacts, regardless of other conditions. The tensile strengths of the sintered compacts were increased with the increase of the carbon contents. The compacts sintered in lower H<SUB>2</SUB> concentration had a tendency to show high strength, even at the same carbon level.
粉体および粉末冶金 44(11), 1004-1008, 1997-11-15
Japan Society of Powder and Powder Metallurgy