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A Repair Method and Application of Single Crystal/Directionally Solidified Nickel-Based Superalloy

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

Active Publication Date: 2020-06-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 can solve the problem of easy cracking and cracking during the repair process of current single crystal / directionally solidified nickel-based superalloy parts. Unable to obtain continuous directional growth tissue

Method used

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  • A Repair Method and Application of Single Crystal/Directionally Solidified Nickel-Based Superalloy
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  • A Repair Method and Application of Single Crystal/Directionally Solidified Nickel-Based Superalloy

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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 present invention involves the field of metal processing, and it has disclosed the repair method and application of single crystal / directional coagulation nickel -based high -temperature alloy.This method includes the following steps: Step 1: Form a layer of transition layer on the surface of the single crystal / directional coagulation nickel -based high -temperature alloy to be repaired through the thermal melting method;Formation of the sedimentation layer, the peak power of the laser metal deposition is 600‑1200W, the power of the laser peak valley is 50‑150W, the time ratio of the laser peak power time to the laser peak power time is 1: 4‑3: 2; the laser frequency is to the frequency of the laser;50z250Hz.The method provided by the present invention is simple and effective. Compared with the traditional repair method, it is conducive to ensuring the suppression of thermal cracks and the continuous growth of columnar crystals, shortening the production cycle.

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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Patent Type & Authority Patents(China)
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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