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Laser cladding repairing method and repairing system for high-temperature alloy single crystal defects

A technology of laser cladding and superalloy, which is applied in the directions of single crystal growth, single crystal growth, self-regional melting method, etc., can solve the problems such as miscellaneous crystals and cracks in superalloy single crystals, and achieve the elimination of miscellaneous crystals and small solidification speed , a wide range of effects

Pending Publication Date: 2022-03-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a laser cladding repair method and repair system for superalloy single crystal defects, which solves the problem of easy generation of miscellaneous crystals and cracks in the process of repairing superalloy single crystals

Method used

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  • Laser cladding repairing method and repairing system for high-temperature alloy single crystal defects
  • Laser cladding repairing method and repairing system for high-temperature alloy single crystal defects
  • Laser cladding repairing method and repairing system for high-temperature alloy single crystal defects

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Embodiment 1

[0054] Proposed case according to the present invention, divide the following steps to carry out.

[0055] (1) Determination of crystal orientation: Take part of the tissue of the blade to be repaired, prepare samples and determine the crystal orientation by EBSD.

[0056] (2) Pickling: Clean the area of ​​the turbine blade to be repaired, open a V-shaped groove, the opening angle θ is 120°, the maximum angle β between the off-axis heat flow direction and the preferred crystal direction is 30°, the laser heat flow direction is kept vertical, off-axis The direction of heat flow is perpendicular to the outline of the V-groove.

[0057] (3) Laser processing: the laser power is 1800W, the scanning speed is 30mm / s, the powder feeding amount is 12g / min, the spot diameter is 1mm, the protective gas argon gas output is 15mL / min, and the overlapping rate of multi-layer cladding layer is 50 %.

[0058] (4) Temperature adjustment: By adjusting the power of the induction heating coil, t...

Embodiment 2

[0062] The steps are the same as in Example 1, except that the maximum angle β between the off-axis heat flow direction and the preferred crystal orientation is 15°, the molten pool temperature is 700°C, the substrate temperature is -50°C, the laser power is 1200W, and the scanning speed is It is 40mm / s, the powder feeding rate is 20g / min, the spot diameter is 2mm, the output of protective gas argon is 15mL / min, and the overlapping rate of multiple cladding layers is 20%. The V-groove opening angle θ is 125° for the microstructure after laser cladding repair, the single crystal epitaxial growth is relatively complete, and the repair effect is better.

Embodiment 3

[0064] The steps are the same as in Example 1, except that the maximum angle β between the off-axis heat flow direction and the preferred crystal orientation is 10°, the molten pool temperature is 800°C, the substrate temperature is -40°C, the laser power is 600W, and the scanning speed is It is 20mm / s, the powder feeding rate is 6g / min, the spot diameter is 1mm, the output of protective gas argon is 15mL / min, and the overlapping rate of multiple cladding layers is 10%. The V-groove opening angle θ is 130° for the microstructure after laser cladding repair, the single crystal epitaxial growth is relatively complete, and the repair effect is better.

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Abstract

The invention belongs to the related technical field of high-temperature alloy, and discloses a laser cladding repairing method and system for high-temperature alloy single crystal defects. The method comprises the following steps: S1, for a to-be-repaired object made of a high-temperature alloy single crystal, determining the lt of the to-be-repaired object; 001gt, 001gt; crystal orientation; s2, a groove is formed in the to-be-repaired position of the to-be-repaired object, laser cladding is conducted through metal powder to fill the groove layer by layer, so that repairing of the to-be-repaired object is achieved, in the laser cladding process, the off-axis heat flow direction is perpendicular to the inner surface of the slope in the groove, and the off-axis heat flow direction is as long as 1t; 001gt, 001gt; and the included angle of the nearest crystal orientation of the middle angle is not more than 30 degrees, so that the growth of mixed crystals in the repairing process is inhibited. The invention further discloses a repairing system adopted by the repairing method. According to the method, the problem that mixed crystals and cracks are easily generated in the high-temperature alloy single crystal repairing process is solved.

Description

technical field [0001] The invention belongs to the technical field related to high-temperature alloys, and more specifically relates to a laser cladding repair method and a repair system for superalloy single crystal defects. Background technique [0002] The aerospace industry has extremely high performance standards for turbine engine blade materials, especially in harsh operating environments, and has certain requirements for material ductility, high temperature strength, fatigue resistance, creep performance and oxidation resistance. Nickel-based single crystal superalloys exhibit stable mechanical properties and oxidation resistance in high-temperature working environments exceeding 1700 °C due to the elimination of all grain boundaries and grain boundary strengthening elements that cause segregation. The current single crystal blade adopts the complex manufacturing process of "precision casting + directional solidification", which has low yield and high manufacturing ...

Claims

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Application Information

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IPC IPC(8): C30B13/00C30B13/28C30B19/00C30B19/06C30B19/10C30B29/52C30B33/00C30B30/00
CPCC30B13/00C30B13/28C30B19/00C30B19/06C30B19/10C30B29/52C30B33/00C30B30/00Y02P10/25
Inventor 陈浩刘德健陈家辉
Owner HUAZHONG UNIV OF SCI & TECH
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