Claims
- 1. A weldable nickel aluminide alloy characterized by being substantially resistant to weld hot cracking, comprising a nickel base and, in wt. %, about 6-12% aluminum, about 6.0-12% chromium, up to about 3% molybdenum, up to about 0.5% boron, and zirconium in a concentration of at least 3.17% and sufficient to provide an adequate concentration of Ni--Zr eutectic phase in the alloy for rendering the weld region of the alloy substantially resistant to weld hot cracking.
- 2. A weldable nickel aluminide alloy as claimed in claim 1, wherein the zirconium concentration of at least 3.17% is a zirconium concentration in the range of 3.17% to about 6.0%.
- 3. A weldable nickel aluminide alloy as claimed in claim 1, wherein the concentration of aluminum is 8%, the concentration of chromium is 7.7%, the concentration of molybdenum is 3.0%, the concentration of boron is 0.003%, and the concentration of zirconium of at least 3.17% is a zirconium concentration in the range of 3.17% to about 6.0%.
- 4. A weldable nickel aluminide alloy as claimed in claim 1, wherein the concentration of aluminum is 8%, the concentration of chromium is 7.7%, the concentration of molybdenum is 1.5%, the concentration of boron is 0.003%, and the concentration of zirconium is in the range of 3.17% to about 6.0%.
- 5. A weld filler metal for welding nickel aluminide alloys comprising a nickel base and, in wt. %, of about 6-12% aluminum, about 6.0-12% chromium, up to about 3.0% molybdenum, up to about 0.5% boron, and zirconium in a concentration of at least 3.17% and sufficient to provide an adequate concentration of an Ni--Zr eutectic phase in a weld region of nickel aluminide alloys welded thereby for rendering the weld substantially resistant to weld hot cracking.
- 6. The weld filler metal as claimed in claim 5, wherein the zirconium concentration of at least 3.17% is a zirconium concentration in the range of 3.17% to about 6%.
- 7. A composite structure comprising at least two nickel aluminide articles welded together with the weld exhibiting essentially no cracks due to weld hot cracking and with the weld comprising a nickel base and, in wt. %, about 6-12% aluminum, about 6.0-12% chromium, up to about 3.0% molybdenum, up to about 0.5% boron, and zirconium in a concentration greater than 2.6%, said weld comprising substantial concentrations of an Ni--Zr eutectic phase.
- 8. A composite structure as claimed in claim 7, wherein at least one of said at least two nickel aluminide articles comprises a nickel base, and in wt. %, about 6-12% aluminum, about 6.0-12% chromium, up to about 3.0% molybdenum, up to about 0.5% boron, and zirconium in a concentration greater than 2.6%.
- 9. A composite structure as claimed in claim 7, wherein at least one of said, at least two nickel aluminide articles comprises a nickel base, and in wt. %, about 6-12% aluminum, about 6.0-12% chromium, up to about 3.0% molybdenum, up to about 0.5% boron, and zirconium in a concentration up to 2.6%.
- 10. A composite structure as claimed in claim 7, wherein said weld is provided by weld filler metal comprising a nickel base and, in wt. %, about 6-12% aluminum, about 6.0-12% chromium, up to about 3.0% molybdenum, up to about 0.5% boron, and zirconium in a concentration greater than 2.6%.
Government Interests
This invention was made with the support of the United States Government under contract No. DE-A05-84OR21400 awarded by the U. S. Department of Energy. The United States Government has certain rights in this invention.
US Referenced Citations (2)
Non-Patent Literature Citations (1)
Entry |
Liu, C. T. et al J. Metals 38(5) 19-21 May 1986. |