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Method for strengthening surface of laser-clad titanium alloy

A laser cladding and surface strengthening technology is applied in the field of laser cladding titanium alloy surface strengthening of Ni-based composite coatings. The effect of small thermal expansion mismatch, reducing thermal stress and eliminating porosity

Inactive Publication Date: 2014-05-07
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the affinity between titanium and oxygen is very high, and it is easy to form pores in the cladding layer; the thermal expansion coefficient of titanium alloy is quite different from that of the alloy and ceramic materials in the cladding material. During the heating and cooling process, the cladding layer and the substrate The thermal expansion and contraction between them are inconsistent, so that a large thermal stress is formed between the cladding layer and the base material, resulting in cracking of the cladding layer
Therefore, it is extremely difficult to obtain a high-quality laser cladding layer on the surface of titanium alloy.

Method used

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  • Method for strengthening surface of laser-clad titanium alloy
  • Method for strengthening surface of laser-clad titanium alloy
  • Method for strengthening surface of laser-clad titanium alloy

Examples

Experimental program
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Embodiment 1

[0051] A preparation method of a laser cladding titanium alloy surface self-lubricating coating, comprising the following steps:

[0052] 1) Pretreatment of the surface of the titanium alloy substrate to be clad: remove the oxide film on the surface of the titanium alloy substrate to be clad;

[0053] In this embodiment, the material of the titanium alloy substrate is TC4. The specific method for removing the oxide film on the surface of the TC4 titanium alloy substrate to be clad: first use 400# metallographic sandpaper to polish the surface to be clad, then immerse in 10% NaOH solution for 3 minutes, take it out and wash it in distilled water, acetone and alcohol in turn Ultrasonic cleaning and final drying;

[0054] In order to prevent the surface to be clad from rapid oxidation again, after removing the oxide film on the surface to be clad, the surface to be clad after removal of the oxide film should be subjected to passivation treatment. In the embodiment of the present...

Embodiment 2

[0067] A method for strengthening the surface of a laser cladding titanium alloy, the difference from Example 1 is:

[0068] 1) The material of the titanium alloy substrate is TC1; when removing the oxide film on the surface of the titanium alloy substrate to be clad, use 1000# metallographic sandpaper to polish the surface to be clad, and then immerse it in 6% NaOH solution for 4 minutes.

[0069] 2) The cladding material is Ni60 alloy powder. The particle size of the Ni60 alloy powder is 50-100 μm.

[0070] 3) The thickness of the coating layer is 1.5mm. The drying temperature is 120° C., and the drying time is 0.9 hours.

[0071] 4) Using ML-108 type CO 2 The laser irradiates the coating on the surface of the titanium alloy, and the laser cladding process parameters are: laser output power P=2kW, beam scanning speed V=1.0mm / s, and spot size D=3mm. During the laser cladding process, argon gas is used to protect the molten pool, and the flow rate of argon gas is 30L / min. ...

Embodiment 3

[0075] A method for strengthening the surface of a laser cladding titanium alloy, the difference from Example 1 is:

[0076] 1) The material of the titanium alloy substrate is TC9; when removing the oxide film on the surface of the titanium alloy substrate to be clad, use 1000# metallographic sandpaper to polish the surface to be clad, and then immerse in 8% NaOH solution for 2 minutes.

[0077] 2) The cladding material is prepared by Ni60 alloy powder and TiC powder at a volume ratio of 50:50. The particle size of the Ni60 alloy powder is 50-100 μm; the particle size of the TiC powder is 50-100 μm.

[0078] 3) Thickness of coating layer: 0.6mm. The drying temperature is 120° C., and the drying time is 0.5 hour.

[0079] 4) Using ML-108 type CO 2 The laser irradiates the coating on the surface of the titanium alloy, and the laser cladding process parameters are: laser output power P=5kW, beam scanning speed V=12mm / s, and spot size D=6mm. During the laser cladding process, ...

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Abstract

The invention discloses a method for strengthening a surface of a laser-clad titanium alloy. The method comprises the following steps: 1), pretreatment of the to-be-clad surface of a titanium alloy substrate, namely removing an oxide film on the to-be-clad surface of the titanium alloy substrate; 2), preparation of a cladding material, namely preparing the cladding material from NiCrBSi alloy powder and TiC according to the condition that the volume ratio of NiCrBSi to TiC is (50-100):(0-50), and mixing evenly; 3) pre-application of the cladding material, namely blending the evenly mixed cladding material with a volatile organic solvent into a paste, coating the to-be-clad surface of the titanium alloy substrate with the plaste so that the coating layer is 0.6-1.5mm thick, and then drying the coating layer; 4) laser cladding, namely irradiating the coating layer by use of a laser so that the coating layer is clad on the titanium alloy substrate. The method is capable of reducing thermal expansion mismatching of the coating layer, reducing residual stress and improving the properties of the coating layer.

Description

technical field [0001] The invention relates to a laser metal surface processing technology, in particular to a laser cladding titanium alloy surface strengthening method using a high-energy-density laser beam ceramic particle TiC reinforced Ni-based composite coating. Background technique [0002] At present, the most extensive research work on laser cladding of titanium alloys is the metal-based composite coating reinforced by ceramic particles. According to the cladding material system, the existing research can be roughly divided into Ti, Co, Ni-based and other types. Such as Zhang Song (see: Zhang Song, Zhang Chunhua, Wang Maocai, etc. Impact abrasive wear performance of laser cladding layer of TiC / Ti composite materials [J]. Acta Metallica Sinica, 2002,38(10):1100-1104.) etc. Ti-Cr 3 C 2 As a cladding material, a TiC particle-reinforced Ti-based composite coating was obtained on the surface of the TC4 alloy, and the impact and abrasive wear resistance of the coating ...

Claims

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Application Information

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IPC IPC(8): C23C24/10B22F1/00
Inventor 孙荣禄牛伟雷贻文唐英
Owner TIANJIN POLYTECHNIC UNIV
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