Modified nickel-chromium-aluminum-iron alloy

Details Modified nickel-chromium-aluminum-iron alloy Modified nickel-chromium-aluminum-iron alloy

1998-08-24

2000-07-25

Yee, Deborah

Alloys or metallic compositions

Nickel base

Chromium containing

420445, 148428, 148675, C22C 1905, C22F 100

Patent

active

060933690

ABSTRACT:
An oxidation-resistant alloy for use in a high-temperature or thermal cycling environment. The alloy comprises a nickel-based matrix having a solid solution of 19-23% chromium and 3-6% aluminum. A self-healing, thermodynamically stable oxide layer is formed upon a surface of the alloy which is exposed to an oxidizing atmosphere over a range of temperatures for extended periods of time. The oxide layer protects the alloy from the oxidizing atmosphere. Additions of calcium and yttrium are made to the matrix to substantially remove or stabilize oxygen and sulfur dissolved in the molten alloy. These additions result in retention of about 0.005-0.05% of calcium and 0.01-0.06% yttrium in the cast alloy. The matrix further includes about 2-8% iron to inhibit nucleation and growth of a "gamma prime" nickel aluminum intermetallic compound which would otherwise adversely harden the alloy and cause local disturbance of a uniform distribution of aluminum. The alloy has a VHN below about 350.

REFERENCES:
patent: 2515185 (1950-07-01), Bieber et al.
patent: 4460542 (1984-07-01), Herchenroeder
patent: 4671931 (1987-06-01), Herchenroeder et al.
Microstructural Evaluation of Nickel-Based Samples From Hoskins Manufacturing Company, by V.K. Sikka dated Mar. 1988.
"Standard Test Method for Accelerated Life of Nickel-Chromium and Nickel-Chromium-Iron Alloys for Electrical Heating," American Socidty for Resting and Materials (Jul. 1990).

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