| 摘要 |
PURPOSE:To obtain a turbine rotor having excellent creep strength at a high temp. and toughness at a low temp. by melting an iron-based alloy consisting of a specific compsn. and subjecting the melt thereof to vacuum carbon deoxidizing, casting and forging, then to heating and rapid cooling treatments, followed by tempering. CONSTITUTION:The iron-based raw material alloy consisting of the specific compsn. is melted and after the melt is subjected to the vacuum carbon deoxidizing and casting, the casting is forged to the shape of the rotor. The forging is then heated to about 1,000-1,150 deg.C and is thereby transformed to austenite structure; thereafter, the forging is transformed to martensite structure by rapid cooling. The forging is in succession thereof tempered at about 550-700 deg.C. The turbine rotor having the compsn. consisting, by weight %, 10-13% Cr, 0.3-1.0% Mn, 0.5-2.0% Mo, <=0.2% Si, 0.1-1.5% Ni, 0.01-0.5% Nb, 0.1-0.5% V, 0.5-2.0% W, 0.05-0.3% C, 0.01-0.1% N, and the balance Fe and inevitable impurities and having the substantially tempered martensite structure is obtd. by the above-mentioned method. |
