Ni-BASED DIRECTIONALLY SOLIDIFIED ALLOY

摘要

The present invention provides first generation Ni-based directionally solidified alloy containing none of Co and Re, which has excellent TMF characteristics, creep property and environment-resistant characteristics, and is superior in cost performance in practical use. The Ni-based directionally solidified alloy according to one embodiment of the present invention consists of Cr: 6% by mass or more and 12% by mass or less; Mo: 0.4% by mass or more and 3.0% by mass or less; W: 6% by mass or more and 10% by mass or less; Al: 4.0% by mass or more and 6.5% by mass or less; Nb: 0% by mass or more and 1% by mass or less; Ta: 8% by mass or more and 12% by mass or less; Hf: 0% by mass or more and 0.15% by mass or less; Si: 0.01% by mass or more and 0.2% by mass or less; Zr: 0% by mass or more and 0.04% by mass or less; B: 0.01% by mass or more and 0.03% by mass or less; and C: 0.01% by mass or more and 0.3% by mass or less, and a balance of Ni and inevitable impurities.