Gas turbine nozzle with excellent heat fatigue resistance

Abstract

Abstract PURPOSE:To obtain a nozzle for a gas turbine with superior thermal fatigue resistance by suing a casting consisting of specified percentages of C, Cr, Co, W, Mo and Ni and contg. eutectic carbide and secondary carbide in the austenite matrix. CONSTITUTION:A nozzle for a gas turbine is formed with a casting consisting of, by weight, 0.1-1% C, 20-35% Cr, 16-35% Co, 5-15% at least one of W and Mo, and the balance Ni or further contg. at least 1 kind of element selected from 0.02-1% Ti and Nb, 0.05-2% Ta, Hf and Zr, and 0.01-1% Y and Al. The casting contains eutectic carbide and secondary carbide in the austenite matrix. The obtd. nozzle has superior thermal fatigue (thermal impact) resistance and a long life.

Inventors

• 👤 Hiromi Kozobara
• 👤 楮原　広美
• 👤 Nobuyuki Iizuka
• 👤 飯塚　信之
• 👤 Hiroshi Fukui
• 👤 寛 福井
• 👤 Masahiko Sakamoto
• 👤 坂本　征彦

Bibliographic Details