Repair method of single crystal/directional solidified nickel-based high-temperature alloy and application of repair method

A nickel-based superalloy, directional solidification technology, applied in the field of metal processing, can solve problems such as easy cracking and inability to obtain continuous directional growth structure, and achieve the effects of ensuring the suppression of thermal cracks, shortening the production cycle, and suppressing the generation of thermal cracks

Active Publication Date: 2019-10-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a single crystal/directionally solidified nickel-based superalloy repair method, which ca...

Method used

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  • Repair method of single crystal/directional solidified nickel-based high-temperature alloy and application of repair method
  • Repair method of single crystal/directional solidified nickel-based high-temperature alloy and application of repair method
  • Repair method of single crystal/directional solidified nickel-based high-temperature alloy and application of repair method

Examples

Experimental program
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Embodiment 1

[0060] Table 1 The composition of the alloy to be repaired in Example 1 of the present invention (wt%)

[0061]

[0062] In this embodiment, parts with alloy compositions shown in Table 1 are repaired, and the parts to be repaired and the laser deposition powder are of the same material.

[0063] Step 1: Perform laser remelting treatment on the wound of the part to be repaired to form a transition layer: the laser remelting power is 130W, the scanning rate is 4mm / s, the laser spot diameter is 3mm, the scanning pass spacing is 0.3mm, and the laser wavelength is 1064nm , the alloy parts have been air-cooled to room temperature before the start of each pass. The thickness of the transition layer is 120 μm.

[0064] Step 2: Carry out laser metal deposition treatment on the transition layer, the peak power is 800W, the peak-valley power is 50W, the peak power is 6ms each time, and the peak-valley power is 4ms each time, alternately (see Figure 4 ), the laser power is 100Hz; t...

Embodiment 2

[0069] The unexplained parts adopt the same method and conditions as in Example 1.

[0070] The laser remelting power is 100W, the scanning speed is 4mm / s, the laser spot diameter is 3mm, the scanning pass spacing is 0.3mm, and the laser wavelength is 1064nm. Alloy parts have been air-cooled to room temperature before the start of each pass. The thickness of the transition layer is 110 μm. Laser metal deposition treatment, the peak power is 800W, the peak-valley power is 100W, the peak power is 2ms each time, the peak-valley power is 8ms each time, alternately, the laser power is 100Hz; the powder feeding amount is 7.2g / min, the carrier gas voltage is 4V, the particle size is 300 mesh, the scanning speed is 4mm / s, the laser spot diameter is 3mm, and the laser wavelength is 1064nm. The scanning strategy is a bidirectional scanning path, the scanning pass interval is 0.5 mm, the alloy parts have been air-cooled to room temperature before each pass, and the deposition layer he...

Embodiment 3

[0073] The unexplained parts adopt the same method and conditions as in Example 1.

[0074] The laser remelting power is 150W, the scanning speed is 12mm / s, the laser spot diameter is 3mm, the scanning pass spacing is 0.5mm, and the laser wavelength is 1064nm. Alloy parts have been air-cooled to room temperature before the start of each pass. The thickness of the transition layer is 50 μm. Laser metal deposition treatment, the peak power is 1200W, the peak-valley power is 150W, the peak power is 6ms each time, the peak-valley power is 4ms each time, alternately, the laser power is 100Hz; the powder feeding amount is 12g / min , the carrier gas voltage is 3.8V, the particle size is 100 mesh, the scanning speed is 12mm / s, the laser spot diameter is 3mm, and the laser wavelength is 1064nm. The scanning strategy is a bidirectional scanning path, the scanning pass interval is 0.5 mm, the alloy parts have been air-cooled to room temperature before each pass, and the deposition layer...

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Abstract

The invention relates to the field of metal machining, and particularly discloses a repair method of a single crystal/directional solidified nickel-based high-temperature alloy and application of therepair method. The method comprises the following steps that 1, a transition layer is formed on the surface of a to-be-repaired part of the single crystal/directional solidified nickel-based high-temperature alloy through a thermal conductance type melting mode; and 2, laser metal deposition treatment is performed on the transition layer to form a deposition layer, wherein the laser peak power ofthe laser metal deposition is 600 W-1200 W, the laser peak valley power is 50 W-150 W, the ratio of the laser peak power duration to the laser peak valley power duration is 1:4 to 3:2, and the laser frequency is 50 Hz-250 Hz. According to the repair method and the application, the method is simple to operate and remarkable in effect, compared with a traditional repair method, the method is beneficial to simultaneously guarantee the inhibition of thermal cracks and the continuous growth of columnar crystals, so that the production period is reduced.

Description

technical field [0001] The invention relates to the field of metal processing. Specifically, it relates to a single crystal / directionally solidified nickel-based superalloy repair method and its application. Background technique [0002] Superalloys are high-alloyed austenitic metal materials that can withstand high temperatures above 600°C, withstand relatively large and complex stresses, and have surface stability. Single crystal nickel-based superalloys are nickel-based superalloys that eliminate all grain boundaries, and directionally solidified nickel-based superalloys are columnar grain nickel-based superalloys prepared by directional solidification with grain boundaries parallel to the principal stress axis. [0003] Due to the elimination of transverse grain boundaries, parts made of single crystal or directionally solidified nickel-based superalloys have excellent high-temperature resistance, and are often used as advanced aero-engines because of their good oxidati...

Claims

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Application Information

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IPC IPC(8): C23C24/10B22F3/105C22C19/05C22F1/10B33Y10/00
CPCC23C24/103C22C19/057C22F1/10B33Y10/00B22F10/00B22F10/25B22F10/366B22F12/41B22F10/364B22F10/36B22F10/64B22F10/322Y02P10/25
Inventor 常保华刘冠都东王开明侯向春
Owner TSINGHUA UNIV
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