Method for refining solidified structure of laser cladding layer by using alternating magnetic field and device thereof
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An alternating magnetic field and laser cladding technology, applied in the field of laser processing, can solve the problems of uneven structure, laser cladding coating cracks, large temperature gradient of the cladding layer, etc. Install simple effects
Inactive Publication Date: 2012-10-03
KUNMING UNIV OF SCI & TECH
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[0005] The purpose of the present invention is to provide a method for refining the solidification structure of the laser cladding layer with an alternating magnetic field and its special device, so as to solve the problems of cracks, pores, uneven structure, and large temperature gradient of the cladding layer in the laser cladding coating.
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Embodiment 1
[0023] Such as figure 1 , a device for refining the solidified structure of the laser cladding layer with an alternating magnetic field, including a cooler 1, CO 2 Laser 2, argon protection device 3, synchronous powder feeder 4, fixture device 5, alternating magnetic field 6, cladding substrate 7, numerical control console 8, among which, cooler 1 and CO 2 Laser 2 connected, CO 2 The laser gun head 9 is set on the laser 2, the synchronous powder feeder 4 is connected to the argon gas protection device 3, the argon gas protection device 3 is connected to the laser gun head 9, and the synchronous powder feeder 4 passes through the protective gas nozzle 1 to the fixture device 5 The cladding matrix 7 sprays composite layer powder, the alternating magnetic field 6 is set under the cladding matrix 7, the numerical control console 8 and the cooler 1, CO 2 The laser 2, the synchronous powder feeder 4 and the fixture device 5 are connected together.
[0024] Firstly, the surface of...
Embodiment 2
[0027] The method and device are the same as in Example 1, only the magnetic field current of the alternating magnetic field is 5A, and the magnetic field strength is 32.0mT. The longitudinal cross-sectional morphology of the obtained coating is shown in Figure 4 shown.
Embodiment 3
[0029] The method and device are the same as in Example 1, only the magnetic field current of the alternating magnetic field is 9A, and the magnetic field strength is 47.7mT. The longitudinal cross-sectional morphology of the obtained coating is shown in Figure 5 shown.
[0030] From image 3 It can be seen that the cladding layer is mainly composed of elongated columnar dendrites with different growth directions, and the top dendrites are small and developed, showing typical epitaxial columnar growth characteristics. From Figure 4 , 5 It can be clearly seen that the structure of the cladding layer changes from columnar dendrite to equiaxed grain, and the grain size is fine and evenly distributed.
[0031] Through the above comparative analysis, it can be concluded that compared with the coating without the action of alternating magnetic field, applying a certain intensity of alternating external magnetic field during the laser cladding process can make the dendrites dif...
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Abstract
The invention relates to a method for refining a solidified structure of a laser cladding layer by using an alternating magnetic field and a device thereof, belongs to the technical field of laser processing. A compound coating is prepared on the surface of a substrate in a manner of conventional powder-feed laser cladding; the alternating magnetic field is applied to acting on a laser molten pool during the laser cladding; the powder-feed laser cladding process is carried out under the alternating magnetic field; and the direction of magnetic lines of force generated by the alternating magnetic field is perpendicular to the scanning speed direction of the laser cladding. The device for refining the solidified structure of the laser cladding layer by using the alternating magnetic field comprises a cooler, a CO2 laser, an argon protector, a synchronous powder feeder, a clamping device, an alternating magnetic field, a cladding substrate body and a numerical control operation floor. The method and the device provided by the invention are capable of obviously refining the solidified structure of the cladding layer; when alternating current with certain frequency is introduced into a coil, an alternating magnetic field can be generated between a metal melt and the magnetic field coil; and the intensity of the alternating magnetic field is controlled so as to change a form of the solidified structure of the cladding layer and refine crystalline grains through changing the intensity of an alternating magnetic field. The device provided by the invention is simple, low in investment cost, high in benefit, etc.
Description
technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to a method for refining the solidified structure of a laser cladding layer by an alternating magnetic field and a special device thereof. Background technique [0002] Laser cladding technology is an advanced surface modification technology that uses a high-energy-density laser beam to melt the cladding material and the surface of the substrate to form a cladding layer with metallurgical bonding characteristics. Its purpose is to improve the wear resistance, corrosion resistance, and Heat resistance and anti-oxidation properties enable the surface of cheap engineering materials to obtain good comprehensive properties. It is an economical and practical means of surface strengthening. It is widely used in industries such as automobiles, aerospace, molds, rolls, petroleum, and thermal power. As we all know, laser rapid melting has the characteristics of high tempe...
Claims
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