NI-BASED CASTING SUPERALLOY AND CAST ARTICLE THEREFROM

摘要

It is an objective of the invention to provide a low cost Ni-based casting superalloy suitable for casting articles having a far better balance among a high-temperature mechanical strength, a grain boundary strength and a oxidation resistance than conventional Ni-based superalloy cast articles. There is provided an Ni-base casting superalloy including: in mass %, 0.03 to 0.15% of C; 0.005 to 0.04% of B; 0.01 to 1% of Hf; 0.05% or less of Zr; 3.5 to 4.9% of Al; 4.4 to 8% of Ta; 2.6 to 3.9% of Ti; 0.05 to 1% of Nb; 8 to 12% of Cr; 1 to 6.9% of Co; 4 to 10% of W; 0.1 to 0.95% of Mo; 0.02 to 1.1% of Si and/or 0.1 to 3% of Fe; and the balance including Ni and incidental impurities.

主权项

1. An Ni-based casting superalloy comprising: 0.03 to 0.15 mass % of C; 0.005 to 0.04 mass % of B; 0.01 to 1 mass % of Hf; 0.05 mass % or less of Zr; 3.5 to 4.9 mass % of Al; 4.4 to 8 mass % of Ta; 2.6 to 3.9 mass % of Ti; 0.05 to 1 mass % of Nb; 8 to 12 mass % of Cr; 1 to 6.9 mass % of Co; 4 to 10 mass % of W; 0.1 to 0.95 mass % of Mo; at least one of 0.02 to 1.1 mass % of Si and 0.1 to 3 mass % of Fe; and the balance including Ni and inevitable impurities.