| 摘要 |
A green compact as a chip material, composed of (by wt.) 2.0-2.5% C, 10-14% Cr, 0.5-2.0% Mo, 0.3-0.9% P, 0.1-0.5% Nb and balance Fe with inevitable imprities and formed to disc shape, is joined to the top surface of a cold-rolled low or medium carbon alloy steel tappet body by diffusion bonding method. The method comprises putting the tip on the top surface of the tappet body and maintaining at 1110-1190 deg.C of sintering temperature for 1hr. under reducing atmosphere, and tempering for oil-cooling after maintaining at 580-630 deg.C for 1hr. under reducing atmosphere, if a cooling rate is rapid enough to appear a quenching effects.
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