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Device for strengthening laser cladding layer by ultrasonic impact and method thereof

A technology of laser cladding and ultrasonic impact, which is applied in laser welding equipment, coating, pressure inorganic powder coating, etc., can solve problems such as uneven structure of laser cladding layer, pore cracks, large residual stress, etc., and achieve strengthening effect Outstanding, low cost, effect of eliminating residual stress

Active Publication Date: 2013-09-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The invention provides a device and method for ultrasonic impact strengthening laser cladding layer, which uses ultrasonic impact to refine the solidification structure of laser cladding layer, reduce the residual stress of laser cladding layer, and solve the problem of uneven structure in laser cladding layer. Pore ​​crack defects, large residual stress and other problems

Method used

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  • Device for strengthening laser cladding layer by ultrasonic impact and method thereof
  • Device for strengthening laser cladding layer by ultrasonic impact and method thereof
  • Device for strengthening laser cladding layer by ultrasonic impact and method thereof

Examples

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Effect test

Embodiment 1

[0031]The laser cladding substrate is nickel-based superalloy GH4169, its chemical composition is shown in Table 1, and its size is 600mm×20mm×5mm. The surface of the substrate is sanded and cleaned with acetone to remove oil and impurities on the surface of the substrate and fixed on the workbench; the laser cladding powder material is nickel-based superalloy powder FGH95 with a particle size of 100-150 μm and its chemical composition is shown in the table 1. Dry the powder in a drying oven at 100-200°C for 6 hours, and add it to the powder feeder after cooling. The laser cladding process is carried out by means of coaxial powder feeding, and argon gas protection is introduced at the same time to obtain a single laser cladding layer. For laser single-pass cladding, the process parameters used are: laser power 1.5kw, scanning speed 400mm / min, powder feeding speed 24g / min, defocusing amount 15mm, spot diameter 3mm.

[0032] The sample was intercepted by wire cutting along the...

Embodiment 2

[0036] The laser single-pass cladding process is the same as that in Example 1. After the laser single-pass cladding, use an ultrasonic impact gun to impact the surface of the laser cladding layer. The ultrasonic impact process parameters are: impact frequency 20Hz, current 0.5A, impact needle diameter 1mm , the number of impact needles is 1, and the coverage rate of the laser cladding layer is guaranteed to reach 100% during impact. The metallographic structure of the obtained laser cladding layer section is as follows: Figure 4 shown.

Embodiment 3

[0038] The laser single-pass cladding process is the same as that of Example 1. After the laser single-pass cladding, use an ultrasonic impact gun to impact the surface of the cladding layer. The ultrasonic impact process parameters are: impact frequency 20Hz, current 2A, impact needle diameter 3mm, impact The number of needles is 1, and the coverage rate of the laser cladding layer is guaranteed to reach 100% during impact. The metallographic structure of the obtained laser cladding layer section is as follows: Figure 5 shown.

[0039] from image 3 It can be seen that the laser cladding layer is mainly composed of columnar dendrites and equiaxed crystals, and the distribution of grains is uneven, and the grain size in local areas is relatively large. from Figure 4 , 5 It can be clearly seen that the structure of the laser cladding layer changes from dendrite to equiaxed grain, and the grain distribution tends to be uniform and the grain size is small.

[0040] From th...

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Abstract

The invention relates to a device for strengthening a laser cladding layer by ultrasonic impact and a method thereof. A conventional powder feeding type laser cladding method is used for preparing the laser cladding layer on the surface of a cladding base material; after one path of laser cladding is finished, the ultrasonic impact is used for playing effects on the laser cladding layer; when a plurality of paths and layers of laser cladding are carried out, the laser cladding and the ultrasonic impact are alternatively carried out. According to the device and the method disclosed by the invention, the laser cladding layer is obviously strengthened to refine tissues of the laser cladding layer and eliminate residual stress in the laser cladding layer; when the ultrasonic impact is used for playing the effect on the laser cladding layer, a plastic deformation layer with a certain depth is formed in the laser cladding layer; grains and crystal lattices in the plastic deformation layer are distorted to form high-density dislocation so that dendritic crystals in condensation tissues of the laser cladding layer are crushed and are dispersed into the laser cladding layer to form small crystal nucleuses which are uniformly distributed and refine the grains; meanwhile, the ultrasonic impact is used for planting pressing stress into the laser cladding layer to counteract pulling stress in the laser cladding layer and eliminate the residual stress in the laser cladding layer.

Description

technical field [0001] The invention relates to an ultrasonic impact strengthening laser cladding layer device and method thereof, which belong to the technical field of laser processing application and the technical field of metal impact strengthening. Background technique [0002] Laser cladding technology uses high-energy laser beams to rapidly melt and solidify materials to form a good metallurgical bond with the substrate, which can be used in the fields of material surface modification and rapid prototyping of parts. This technology has the characteristics of dense cladding layer structure, material gradient function, fast forming, short production cycle, high degree of flexibility and good controllability, etc. It is widely used in aerospace, automobile, mold, ship and other industries. Relevant studies have shown that factors such as uneven distribution of laser energy, large temperature gradient during the cladding process, and fast solidification rate lead to uneve...

Claims

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Application Information

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IPC IPC(8): C23C24/10C23C24/04B23K26/14B23K26/34C21D7/04
CPCB23P6/007
Inventor 赵剑峰戚永爱田宗军肖猛谢德巧沈理达
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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