| 摘要 |
PROBLEM TO BE SOLVED: To secure strength of a ferrous sintered alloy equal to or higher than that of an existing Fe-Ni-Cu-Mo alloy without using Ni for achieving improvement in productivity due to reduction in cost and a sintering time.SOLUTION: A ferrous sintered alloy wherein 97% or more, in area ratio, of a metal structure except pore parts is a martensitic phase is obtained by sintering a completely alloyed powder having a composition, wherein any of (1): Cr, Mo and C, (2): Cu, Cr, Mn, Mo and C, and (3): Cu, Mo and C and ≤0.6 wt% of a lubricant are added to Fe, in a condition of ≥1,250°C for ≥15 min after press molding, and then, performing cooling for quench hardening at a rate of ≥2 °C/sec. |
