21-4Nバルブ鋼の機械的性質に対する熱処理の影響
1965 年 14 巻 142 号 p. 549-556
詳細
1965 年 14 巻 142 号 p. 549-556
The room and elevated temperature mechanical properties as well as the aging characteristics after various heat-treatment have been investigated on commercial 21-4N valve steel. The results obtained are as follows:
(1) Solution temperature of 1200°C is suitable for this steel.
(2) In aging the sufficiently solution treated steel at 900∼1000°C, both general and lamellar precipitation occur, but in the steel aged at temperatures below 800°C only general precipitates appear. In the insufficiently solution treated steel at the temperatures below 1150°C, however, only general precipitation takes place regardless of the aging temperature.
(3) This steel shows high strength and toughness even in solution treated state. The aging causes only slight improvement of strength, but the toughness at room temperature decreases remarkably by aging, particularly by high temperature aging in which the lamellar precipitation occurs.
