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 super

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

Examples

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Example Embodiment

[0053] Example 1

[0054] According to the present invention, the following steps are performed.

[0055] (1) Crystal direction: Repair the retaining blade part of the tissue, sample and determine crystal orientation with EBSD.

[0056] (2) Acid washing: Clean the turbine blade to be repaired, open the V-tank, the opening angle θ is 120 °, the axial hot flow direction and the maximum angle β of the chime crystal direction is 30 °, the laser heat flow direction is perpendicular, away from the shaft The direction of heat flow is vertical with the V-trough outline.

[0057] (3) Laser processing: The laser power is 1800W, the scanning speed is 30mm / s, the amount of powder powder is 12g / min, the spot diameter is 1 mm, and the gas argon gas is 15ml / min, multi-channel molten coating lap rate 50 %.

[0058] (4) Temperature adjustment: By adjusting the sensing heating coil power, the two-color high temperature meter is maintained at 900 ° C, and the cooling system holds the temperatu...

Example Embodiment

[0061] Example 2

[0062] The step is the same as that of Example 1, and the difference is that the maximum angle β of the off-axial heat flow direction and the preferred crystalline direction is 15 °, the molten tank temperature is from 700 ° C, the matrix temperature is -50 ° C, the laser power is 1200W, the scanning speed It is 40mm / s, the amount of powder is 20 g / min, the spot diameter is 2mm, and the gas-free argon gas is 15 ml / min, and the multi-bearing coating is 20%. Micro tissue after the V-groove opening angle θ is 125 ° laser molten repair, the single crystal epitaxial growth is relatively complete, and the repair effect is better.

Example Embodiment

[0063] Example 3

[0064] The step is the same as that of Example 1, at which the maximum angle β of the off-axial heat flow direction and the preferred crystal direction is 10 °, the temperature of the molten tank is 800 ° C, the matrix temperature is -40 ° C, the laser power is 600W, the scanning speed It is 20mm / s, the amount of powder powder is 6 g / min, the spot diameter is 1 mm, and the gas is 15 ml / min, and the multi-bearing coating is 10%. The microstructure after the V-tank opening angle θ is 130 ° laser-clad repair, and 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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