Alloy powder mixture for treating alloys
First Claim
1. An improved mixture of alloy powders for use in treating a preselected article alloy of predetermined composition range and based on an element selected from the group consisting of Ni and Co, at a temperature less than the incipient melting temperature of the article alloy;
- the mixture having at least three distinct groups of alloy powders together defining a mixture composition range;
each alloy powder of the groups characterized by a composition and melting range different from the others and from the article alloy;
a first of the groups having at least one alloy each with a melting range higher than the melting ranges of the alloys in other groups and further characterized by;
(a) substantially all of elements selected from the group consisting of W and Mo, and(b) substantially all of any C included in the mixture composition;
the second of the groups having at least one alloy each with a melting range lower than alloys in the first group, and further characterized by;
(a) the substantial absence of elements selected from the group consisting of W and Mo, and(b) the substantial absence of C;
the alloys of the second group comprising Cr, Al, and at least one element selected from the group consisting of Ni and Co; and
a third of the groups having at least one eutectic alloy each with a melting range lower than alloys of the second group, the alloys of the third group being characterized by the substantial absence of C;
the mixture composition range characterized by less than 2 wt. % total of elements selected from the group consisting of B and Si, less than 1 wt. % C, and including 15-30 wt. % Cr, 1-7 wt. % W, and 1-6 wt. % Ta.
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Accused Products
Abstract
An improved mixture of alloy powders is provied for use in treating a preselected article alloy, for example, to repair or join multiple components of the article. The mixture has at least three distinct groups of alloy powders which together define a mixture composition range, with each alloy powder of the groups characterized by a composition and melting range different from the others and from the article alloy. In a preferred form, the mixture composition range comprises, by weight, 15-30% Cr, 1.5-6% W, 0.4-4% Al, 1-11% Ti, 1-6% Ta, up to 1.5% B, up to 0.5% Si, up to 0.2% Zr, up to 3% Mo, up to 0.3% Hf, up to 6% Cb, up to 2% Re, with the balance selected from Co and Ni along with incidental impurities.
87 Citations
20 Claims
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1. An improved mixture of alloy powders for use in treating a preselected article alloy of predetermined composition range and based on an element selected from the group consisting of Ni and Co, at a temperature less than the incipient melting temperature of the article alloy;
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the mixture having at least three distinct groups of alloy powders together defining a mixture composition range; each alloy powder of the groups characterized by a composition and melting range different from the others and from the article alloy; a first of the groups having at least one alloy each with a melting range higher than the melting ranges of the alloys in other groups and further characterized by; (a) substantially all of elements selected from the group consisting of W and Mo, and (b) substantially all of any C included in the mixture composition; the second of the groups having at least one alloy each with a melting range lower than alloys in the first group, and further characterized by; (a) the substantial absence of elements selected from the group consisting of W and Mo, and (b) the substantial absence of C; the alloys of the second group comprising Cr, Al, and at least one element selected from the group consisting of Ni and Co; and a third of the groups having at least one eutectic alloy each with a melting range lower than alloys of the second group, the alloys of the third group being characterized by the substantial absence of C; the mixture composition range characterized by less than 2 wt. % total of elements selected from the group consisting of B and Si, less than 1 wt. % C, and including 15-30 wt. % Cr, 1-7 wt. % W, and 1-6 wt. % Ta. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a method of repairing a repair area of an article of an alloy of predetermined composition range and based on an element selected from the group consisting of Ni and Co, the steps of:
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A. disposing at the repair area an improved mixture of alloy powders which can be used in treating the alloy of the article at a temperature less than the incipient melting temperature of the alloy; (1) the mixture having at least three distinct groups of alloy powders together defining a mixture composition range; (2) each alloy powder of the groups characterized by a composition and melting range different from the others and from the article alloy; (3) a first of the groups having at least one alloy each with a melting range higher than the melting ranges of the alloys in other groups and further characterized by; (a) substantially all of elements selected from the group consisting of W and Mo, and (b) substantially all of any C included in the mixture composition; (4) the second of the groups having at least one alloy each with a melting range lower than alloys in the first group, and further characterized by; (a) the substantial absence of elements selected from the group consisting of W and Mo, and (b) the substantial absence of C; (c) the alloys of the second group comprising Cr, Al, and at least one element selected from the group consisting of Ni and Co; and (5) a third of the groups having at least one eutectic alloy each with a melting range lower than alloys of the second group, the alloys of the third group being characterized by the substantial absence of C; (6) the mixture composition range characterized by less than 2 wt. % total of elements selected from the group consisting of B and Si, less than 1 wt. % C, and including 15-30 wt. % Cr, 1-7 wt. % W, and 1-6 wt. % Ta; B. heating the area below the incipient melting temperature of the alloy and in a first temperature range of about 2125°
-2275°
F. for a time sufficient to flow at least a portion of the powder mixture at the repair area; and
thereafter,C. heating the repair area in a second temperature range below the first temperature range for at least about 8 hours to diffuse at least a portion of the powder mixture with the alloy of the article and to provide the repair area microstructure with a fine dispersion of second phase borides or carbides or both. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification