Laser cladding method for inhibiting cracking of FeCoCrNiMnAl high-entropy alloy cladding layer

A high-entropy alloy and laser cladding technology, which is applied in the field of high-entropy alloys, can solve the problems of low production cost, unenvironmental protection of the process, and high production cost, and achieve the effects of low production cost, environmental protection process and high product quality

Pending Publication Date: 2021-12-24
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects that the FeCoCrNiMnAl high-entropy alloy cladding layer described in the above prior art will produce cracks, the process is not environmentally friendly and the production cost is high, and to provide a laser cladding that inhibits the cracking of the FeCoCrNiMnAl high-entropy alloy cladding layer Method, the provided laser cladding method adopts the non-melting electrode gas shielded welding pretreatment method in the pretreatment, and adopts the laser cladding method to prepare the high-entropy alloy coating, which can effectively reduce the residual stress of the cladding layer and inhibit the cladding layer. Cracks in the cladding, improve product quality, environmentally friendly process, and lower production costs

Method used

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  • Laser cladding method for inhibiting cracking of FeCoCrNiMnAl high-entropy alloy cladding layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A laser cladding method for suppressing cladding layer cracking, comprising the steps of:

[0020] The tungsten pole of the argon tungsten arc welding torch protrudes from the front end of the torch, and the horizontal distance between the projection of the tungsten pole of the argon tungsten arc welding torch on the workpiece surface and the projection of the laser spot center of the laser cladding nozzle on the workpiece surface The diameter of the tungsten electrode used in the argon tungsten arc welding torch is 2mm, and the extension end of the tungsten electrode of the argon tungsten arc welding torch is 5mm;

[0021] The diameter of the laser spot of the laser cladding nozzle is 2mm;

[0022] The shielding gas of argon tungsten arc welding torch and laser cladding adopts one of nitrogen and argon, and the air flow of the shielding gas is selected as 20L / min.

[0023] The current of the argon tungsten arc welding torch is 50A, the AC frequency of the argon tungst...

Embodiment 2

[0029] This embodiment is the second embodiment of the laser cladding method of the present invention. The difference from Embodiment 1 is that the current of the argon tungsten arc welding torch is 80A, the AC frequency of the argon tungsten arc welding torch is 70Hz, and the laser cladding The power is 1800w, and the powder spraying volume is 15L / min.

[0030] Other steps are identical with embodiment 1. The thickness of the cladding layer in this embodiment is 3mm.

[0031] Experimental results: After the X-ray flaw detection experiment, it was found that the cladding layer obtained in Example 2 had no cracks on the surface. The average hardness of the obtained cladding layer is 562HV. The indentation strain method is used to measure the residual compressive stress on the surface. According to the national standard GB / T24179-2009, the pressure ball is a cloth-type hard alloy indenter with a diameter of 2.5mm. The model is XL2101B5 static strain measuring instrument, and t...

Embodiment 3

[0033] The difference from Example 1 is that the current of the argon tungsten arc welding torch is 30A, the AC frequency of the argon tungsten arc welding torch is 50Hz, the laser cladding power is 1200w, and the powder injection rate is 10L / min.

[0034] Other steps are identical with embodiment 1. The cladding layer thickness of the present embodiment is 1mm;

[0035] Experimental results: After the X-ray flaw detection experiment, it was found that the cladding layer obtained in Example 3 had no cracks on the surface. The average hardness of the obtained cladding layer is 571HV. The indentation strain method is used to measure the residual compressive stress on the surface. According to the national standard GB / T24179-2009, the pressure ball is a cloth-type hard alloy indenter with a diameter of 2.5mm. The model is XL2101B5 static strain measuring instrument, and the model is BFI20- 1.5CF strain gauge, resistance value 120±0.2Ω, gage factor 2.08±1%. Under the load force...

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Abstract

The invention discloses a laser cladding method for inhibiting cracking of a FeCoCrNiMnAl high-entropy alloy cladding layer. According to the method, a TIG welding gun and a laser cladding nozzle are fixed in the same horizontal plane, TIG welding is arranged before laser cladding in the walking direction, the TIG welding gun and the laser cladding nozzle are both perpendicular to the surface of a workpiece, and one of nitrogen and argon is adopted as the protective gas for the TIG welding gun and laser cladding. According to the method, the problem that the FeCoCrNiMnAl high-entropy alloy cladding layer cracks is solved, the residual stress of the cladding layer is effectively reduced, cracks of the cladding layer are inhibited, the product quality is improved, the technology is environmentally friendly, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, and more specifically relates to a laser cladding method for suppressing cracking of FeCoCrNiMnAl high-entropy alloy cladding layers. Background technique [0002] At present, high-entropy alloy bulks are mainly prepared by arc melting method. However, the added elements (such as Cr, Ni, Co, W, Mo, Ti, etc.) are expensive, and the cost is higher than most traditional alloys, and the size of the prepared sample is limited. Laser cladding technology is a surface preparation technology with the characteristics of high efficiency and strong flexibility. It can prepare a material layer that meets special performance requirements on the surface of traditional materials, which can not only effectively reduce production costs, but also overcome size limitations. Therefore, laser cladding technology is increasingly used to manufacture high-entropy alloys. [0003] Since laser cladding is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10C22C30/00B23K26/342B23K26/348
CPCC23C24/106C22C30/00B23K26/342B23K26/348
Inventor 胡绳荪崔妍申俊琦耿可屏
Owner TIANJIN UNIV
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