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Interlayer alloy of DD6 nickel-based single crystal high temperature alloy used for transient liquid phase (TLP) bonding and preparation method thereof

A nickel-based single crystal, high-temperature alloy technology, applied in the field of welding materials, can solve problems such as weld thermal cracks and low strength of brazed joints, and achieve the effects of easy processing and assembly, low production cost, and good matching

Inactive Publication Date: 2011-11-23
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DD6 superalloy fusion welding is prone to weld thermal cracks, and the strength of brazed joints is low

Method used

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  • Interlayer alloy of DD6 nickel-based single crystal high temperature alloy used for transient liquid phase (TLP) bonding and preparation method thereof

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The preparation method of the aforementioned intermediate layer alloy of the present invention is implemented according to the following steps,

[0015] Step A, using an ultra-high vacuum electric arc furnace to melt the master alloy:

[0016] A1. Weigh the following high-purity metals according to atomic percentage: the total percentage is 100%, of which: B is 3%-3.6%, Co is 3%-4.5%, Cr is 1%-2%, and W is 2.5% %-4%, Al is 1.5%-3%, Mo is 1.5%-3%, and the balance is Ni. The purity of all high-purity metals is higher than 99.99%; High-purity metals are purified separately;

[0017] A2. Divide the Ni purified and treated in step A1 into three parts, each part of Ni and other high-purity metals are melted and matched according to the combination of Ni-Co-Cr, Ni-Al, and Ni-B-W, and three groups of middle parts are obtained. transition alloys;

[0018] A3, the three groups of intermediate transition alloys obtained in step A2 are put together for secondary fusion to obtain...

Embodiment 1

[0025] Weigh each component element content according to the data of embodiment 1 in table 1, and implement according to the following steps:

[0026] Step A, using an ultra-high vacuum electric arc furnace to melt the master alloy:

[0027] A1, each high-purity metal weighed is carried out purifying treatment respectively with boric anhydride;

[0028] A2. Divide the Ni purified and treated in step A1 into three parts, each part of Ni and other high-purity metals are melted and matched according to the combination of Ni-Co-Cr, Ni-Al, and Ni-B-W, and three groups of middle parts are obtained. transition alloys;

[0029] A3, the three groups of intermediate transition alloys obtained in step A2 are put together for secondary fusion to obtain the intermediate master alloy;

[0030] Step B, using a single-roll rapid solidification device, controlling the linear speed of the roller at 5m / s, preparing the intermediate master alloy obtained in step A3 into a foil, the thickness of...

Embodiment 2

[0032] Example 2: According to the steps of Example 1 above, the elements and contents of each component were weighed according to the data in Example 2 in Table 1, and the prepared product had a thickness of 30-80 μm, a width of 5-8 mm, and a length of 1-2 m. The intermediate layer alloy foil prepared in Example 2 was applied to the TLP method to weld the DD6 nickel-based single crystal superalloy sample. The welding process parameters were: welding temperature 1200°C, holding time 8h, welding pressure 0.3MPa, Vacuum degree 5×10 -2 Pa. The heating specification is: heating to 1000°C at a heating rate of 10°C / min, holding for 30 minutes; welding temperature of 1200°C, holding for 8 hours, and cooling to room temperature with the furnace. The microstructure of the obtained welded joint has a good match with the base metal, and the weld is a single crystal microstructure.

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Abstract

The invention discloses an interlayer alloy of a DD6 nickel-based single crystal high temperature alloy used for transient liquid phase (TLP) bonding. The interlayer alloy comprises the following components by atom percent: 3%-3.6% of B, 3%-4.5% of Co, 1%-2% of Cr, 2.5%-4% of W, 1.5%-3% of Al, 1.5%-3% of Mo and the balance of Ni, wherein the sum of the atom percents is 100%. The invention also discloses a preparation method of an interlayer alloy foil material. The preparation method comprises the following steps: performing step smelting and using a single-roller rapid solidification device to prepare the interlayer alloy foil material. The interlayer alloy disclosed by the invention has good flexibility and is convenient to process and assemble; when being welded, the interlayer alloy can be well matched with the DD6 nickel-based single crystal high temperature alloy and the brazed joint has a single crystal appearance and structure; and the preparation method of the interlayer alloy foil material has a simple process and low production cost.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and relates to an intermediate layer alloy used for TLP welding of DD6 nickel-based single crystal superalloy, and also relates to a preparation method of the intermediate layer alloy. Background technique [0002] Nickel-based single crystal superalloys have good thermal stability, thermal strength and high-temperature microstructure stability, and have become key materials for aviation and aerospace engine turbine blades. Based on heat dissipation and energy saving considerations, aeroengine turbine blades are often designed as hollow structures, and the manufacture of such complex structures inevitably involves welding issues. [0003] DD6 is the second generation nickel-based single crystal superalloy made in China. Fusion welding of DD6 superalloy is easy to produce hot cracks in the weld seam, and the strength of the brazed joint is low. The transition liquid phase diffusion bon...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/03
Inventor 徐锦锋翟秋亚陆天宇
Owner XIAN UNIV OF TECH
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