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Metal surface acute deformation alloying method

A metal surface and alloying technology, applied in the direction of pressure inorganic powder coating, etc., can solve the problems of low efficiency, low metal surface alloying effect, complex process, etc., achieve simple process, prevent cracks, and improve comprehensive mechanical properties Effect

Inactive Publication Date: 2016-07-27
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a method for metal surface alloying with severe deformation, and solve the technical problems of low metal surface alloying effect, complex process and low efficiency in the prior art

Method used

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  • Metal surface acute deformation alloying method

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Effect test

Embodiment 1

[0036] Example 1: Surface deformation alloying of 20 steel

[0037] First, cut the 20-steel plate into 30mm×40mm samples, wash the samples with acetone, remove the oil on the surface of the material, wash it with water, and grind it with W20 and W50 sandpaper until there are basically no obvious scratches on the surface of the material and In the same direction, wash with alcohol and dry for later use. Afterwards, the impact alloying treatment is carried out, and the impact equipment is used for deformation treatment. When using, the sample is clamped, 3mm Cr powder is spread on the surface of the sample, and the impact device is used for impact treatment. As the Cr powder, 3.5N (99.95% purity) pure Cr powder with a particle size of about 75 μm (200 mesh) was used. For impact treatment, an impact drill with a radius of curvature of 2mm is used, the impact energy is 1J, the impact frequency is 80 times per second, and the impact time is about 30 minutes. Finally, spread a lay...

Embodiment 2

[0039] Embodiment 2: Surface deformation alloying of Q235 steel

[0040] First, cut the Q235 steel plate into 30mm×40mm samples, clean the samples with acetone, remove the oil on the surface of the material, wash it with water, and grind it with W20 and W50 sandpaper until there are basically no obvious scratches on the surface of the material and In the same direction, wash with alcohol and dry for later use. Afterwards, the impact alloying treatment is carried out, and the impact equipment is used for deformation treatment. When using, the sample is clamped, 1mm of Cr powder is spread on the surface of the sample, and the impact head is used to impact the surface of the sample. As the Cr powder, 3.5N (99.95% purity) pure Cr powder with a particle size of about 75 μm (200 mesh) was used. During the impact treatment, a 2mm impact drill bit is used, the impact energy is 3J, the impact frequency is 20 times / second, and the impact is about 5min. Finally, spread a layer of Cr po...

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Abstract

The invention discloses a metal surface acute deformation alloying method. The metal surface acute deformation alloying method is characterized by comprising the following steps: (1) the surface of a metal sample is pretreated; (2) alloying metal powder is uniformly applied on the surface of the metal sample; (3) an impact device is adopted to continuously impact the surface of the metal sample; (4) the alloying metal powder is uniformly applied on the impacted surface of the metal sample; and (5) the metal sample is put in a vacuum annealing furnace for return treatment. The metal surface acute deformation alloying method is simple in process, is controllable in impact force in the punching process, can form higher residual compressive stress on the surface, facilitates prevention of cracks, and prolongs the service life.

Description

technical field [0001] The invention relates to a method for severe deformation alloying of metal surfaces, which belongs to the technical field of metal material surface deformation strengthening. Background technique [0002] The failure of metal material components mainly originates from the surface, so the surface of metal materials is required to have excellent properties. Alloying can effectively repair the surface and improve properties such as strength and toughness, corrosion resistance and wear resistance. Severe plastic deformation is an emerging metal surface alloying method. Through refining grains and alloying, and forming compressive stress on the surface, it hinders the generation and expansion of cracks during the use of materials and improves their service life. [0003] The commonly used methods of severe plastic deformation on the surface include rolling, mechanical grinding, shot peening, etc. However, the depth of the alloyed layer obtained by these me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/02
CPCC23C24/02
Inventor 毛向阳姚瑶杨红艳陈浩张文君王章忠张庆磊
Owner NANJING INST OF TECH
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