| 摘要 |
<p>Sintered, high-V, high-speed steel containing 1.4 to 9.0% C, 10.0 to 24.0 % "W + 2Mo (in terms of W)", 3.0 to 6.0 % Cr, 8.5 to 38 % V, up to 17 % Co, and the balance of Fe and unavoidable impurities and having excellent hardness and toughness, and a process for its production by powder metallurgy, which comprises using a powder of oxides corresponding to the metal ingredients of the alloy, adding carbon powder thereto, mixing and pulverizing the resulting mixture, heating the mixture in a hydrogen stream to co-reduce the oxides with hydrogen and carbon and simultaneously form an alloy, adjusting the composition and particle size of the resulting alloy powder, molding and sintering the alloy powder in vacuo, then conducting heat treatment to make the alloy matrix martensitic.</p> |
