High-performance brazing method for Ni3Al-based single crystal alloy

A brazing method and a single-crystal-based technology are applied in welding media, welding equipment, metal processing equipment, etc., and can solve problems such as long TLP diffusion welding holding time, impact on structure and performance, and poor process applicability, and achieve interface The effect of good organization, good combination, and mechanical properties up to standard

Active Publication Date: 2020-12-01
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ni 3 Al belongs to Ni-Al intermetallic compound, Ni 3 The content of Al, W, Ta and other elements in Al-based single crystal alloys is relatively high, so it is difficult to weld by argon arc welding, laser welding, electron beam welding, plasma arc welding and other welding methods, not only prone to cracks, but also In the case of recrystallization due to local melting and cooling of the base metal, it will have a great impact on its structure and properties; although transient liquid phase diffusion bonding (TLP) can realize Ni 3 Effective connection of Al-based single crystal alloys, but the holding time of TLP diffusion welding is longer (generally more than 20h), the efficiency is low, the cost is high, and the pre-weld assembly and weld gap control requirements are strict, and the process applicability is not good.

Method used

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  • High-performance brazing method for Ni3Al-based single crystal alloy
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  • High-performance brazing method for Ni3Al-based single crystal alloy

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Effect test

Embodiment I

[0028] The brazing method of present embodiment IC21 single crystal alloy comprises the steps:

[0029] Step 1: Clean up before welding

[0030] IC21 single crystal alloy (solution heat treatment state) is machined to remove the oxide skin on the surface, and processed into such as figure 1 The dimensions shown are (Φ15×33) mm cylindrical IC21 single crystal alloy base materials 1 and 2 to be welded; ultrasonic cleaning for 15 minutes before assembly removes oil and other impurities on the surface of IC21 single crystal alloy base materials 1 and 2 to be welded.

[0031] Step 2: Assembly positioning

[0032] On the fixture, press the figure 1 As shown, two IC21 single crystal alloy base metals 1 and 2 with a size of (Φ15×33) mm are butt-jointed and assembled along the axial direction, and the brazing gap of the joint 5 to be welded is controlled to be 50 μm. Fix the high-temperature alloy sheets 4 (3 uniformly distributed along the circumference at intervals of 120°) on the...

Embodiment 2

[0044] The brazing method of present embodiment IC21 single crystal alloy comprises the steps:

[0045] Step 1: Clean up before welding

[0046] IC21 single crystal alloy (solution heat treatment state) is machined to remove the oxide skin on the surface, and processed into such as figure 1 The shown size is (Φ15×33) mm cylindrical IC21 single crystal alloy base materials 1 and 2 to be welded; ultrasonic cleaning for 20 minutes before assembly removes oil and other impurities on the surface of IC21 single crystal alloy base materials 1 and 2 to be welded.

[0047] Step 2: Assembly positioning

[0048] On the fixture, press the figure 1 As shown, two IC21 single crystal alloy base metals 1 and 2 with a size of (Φ15×33) mm are butted together along the axial direction to be welded, and the brazing gap of the joint 5 to be welded is controlled to be 100 μm. Fix the high-temperature alloy sheets 4 (3 uniformly distributed along the circumference at intervals of 120°) on the end...

Embodiment 3

[0060] The brazing method of present embodiment IC21 single crystal alloy comprises the steps:

[0061] Step 1: Clean up before welding

[0062] IC21 single crystal alloy (solution heat treatment state) is machined to remove the oxide skin on the surface, and processed into such as figure 1 The shown size is (Φ15×33) mm cylindrical IC21 single crystal alloy base materials 1 and 2 to be welded; ultrasonic cleaning for 20 minutes before assembly removes oil and other impurities on the surface of IC21 single crystal alloy base materials 1 and 2 to be welded.

[0063] Step 2: Assembly positioning

[0064] On the fixture, press the figure 1 As shown, two IC21 single crystal alloy base metals 1 and 2 with a size of (Φ15×33) mm are butted together along the axial direction to be welded, and the brazing gap of the joint 5 to be welded is controlled to be 200 μm. Fix the high-temperature alloy sheets 4 (3 uniformly distributed along the circumference at intervals of 120°) on the end...

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Abstract

The invention belongs to the technical field of welding, and particularly relates to a high-performance brazing method for a Ni3Al-based single crystal alloy. A novel high-temperature-resistant Ni-Cr-W-Mo-Si brazing filler metal is applied, and a brazing process suitable for the brazing filler metal and the Ni3Al-based single crystal alloy is provided. The brazing process mainly includes the stepsof cleaning before brazing, assembling and positioning, brazing filler metal presetting, vacuum brazing, and heat treatment after welding. By means of the brazing filler metal and the process, an excellent brazed joint structure can be obtained; a brazing seam and a base metal interface are well combined; meanwhile, the brazing seam is free of welding defects and low in melting point phase; and aNi3Al-based single crystal alloy brazed joint brazed according to the process has the high mechanical property meeting the using requirement.

Description

technical field [0001] The invention belongs to the technical field of welding, in particular to a Ni 3 High performance brazing method for Al-based single crystal alloys. Background technique [0002] In response to the demand for service performance of aero-engine turbine blades, Ni, which has the characteristics of high melting point, low density, good oxidation resistance and high temperature strength, has been independently developed in China. 3 Al-based single crystal alloys, and are constantly being developed driven by the performance improvement of advanced aero-engines, a new generation of Ni 3 The temperature bearing capacity of Al-based single crystal alloys has reached or exceeded 1100 °C. [0003] with Ni 3 The application of Al-based single crystal alloy materials has drawn much attention to the processing technology related to it. Especially in the welding technology of the alloy, it is not only required to have high strength of the welded joint under high...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K3/08B23K35/30
CPCB23K1/008B23K1/20B23K1/206B23K3/08B23K35/304
Inventor 孔庆吉刘纪德赵伟徐彦强刘悦
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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