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A preparation method of carburizing strengthened biomimetic structure based on pulsed arc

A pulsed arc and carburizing technology, which is applied in the field of carburizing and strengthening the bionic structure, can solve the problems of uncontrollable scale shape, unsuitable for promotion and use, expensive equipment, etc., to achieve improved viscosity reduction, improved wear resistance, and low cost Effect

Active Publication Date: 2019-09-10
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is expensive in equipment, high in cost, and cannot control the shape of the scales, so it is not suitable for popularization

Method used

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  • A preparation method of carburizing strengthened biomimetic structure based on pulsed arc
  • A preparation method of carburizing strengthened biomimetic structure based on pulsed arc
  • A preparation method of carburizing strengthened biomimetic structure based on pulsed arc

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: Taking pulse arc carburizing as an example to strengthen the scaly bionic structure, the process includes the following steps:

[0030] The welding machine model used in this example is YJHB-2 precision welding machine, purchased from Yijing Electronics Co., Ltd., and the purchased graphite electrode specification is R 0 (1mm)×L 0 (300mm), purchased from Shenzhen Baide Hardware Machinery Co., Ltd.

[0031] (1) Grinding, polishing and cleaning the surface of the alloy sample (45# steel sample) with a surface size of 40*40mm to remove impurities such as oil stains and oxide layers on the surface of the alloy sample. The specific steps are: first use a grinding machine Remove the oxide layer and sand grains on the surface of the alloy sample (45# steel sample), and then use a non-woven cloth dipped in thinner to clean the oil and other impurities on the surface of the sample (45# steel sample); , sandpaper and polishing cloth etc. are all prior art, can direct...

Embodiment 2

[0047] According to the steps described in Example 1, an overlapping scale-like bionic structure is prepared on the surface of the titanium metal sample, wherein the pulse current is 70A, the pulse time is 40ms, the diameter of the graphite electrode is 1.2mm, and the distance between the graphite electrode and the surface of the titanium metal sample Controlled at 0.5mm, the overlapping part of the scale-like bionic structures does not exceed half the diameter of the molten pool. Scanning electron microscopy was used to observe the surface morphology of titanium metal samples, such as figure 1 As shown, the surface composition of the titanium metal sample obtained by X-ray energy spectroscopy is as follows: image 3 as shown, image 3 The surface composition data of titanium metal samples in Table 4. Depend on figure 1 It can be seen that the structure generated by the pulse is circular, and the scale-like biomimetic structure is obtained by stacking the circular spots. Th...

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Abstract

The invention discloses a preparation method of a carburization-reinforced bionic structure based on pulsed arcs. According to the preparation method, a graphite electrode is adopted as the anode, a pulsed power supply is utilized to generate the pulsed arcs, arc reinforcing is conducted on the surface of an alloy substrate, and an anode carbon source leaves from the surface of the electrode at ahigh speed and at the high temperature along the arcs and meanwhile impacts the surface of the substrate in an orientated mode along a flow field formed by the arcs; and the substrate forms small molten baths under the effect of the arcs, thus carbon enters the substrate to complete carburization, the circular pit-shaped pulsed molten baths are left, and the multiple molten baths are overlaid to form a scale-like bionic structure. According to the preparation method, the microstructure and residual stress of a reinforced bionic area are comprehensively adjusted and controlled, surface carburization is conducted to improve hardness, through the scale-like bionic structure, the contact face is reduced, friction resistance is lowered, the anti-abrasion property of a material can be improved remarkably through combination of surface carburization and the scale-like bionic structure, and particularly, as for application to the abrasive particle abrasion environment, the service life can beprolonged well.

Description

technical field [0001] The invention relates to the technical field of surface modification of agricultural metal materials, in particular to a method for preparing a carburized and strengthened bionic structure based on a pulsed arc. Background technique [0002] Medium and low carbon steel generally refers to non-alloy steel with a carbon content of less than 0.6%. Medium and low carbon steel and titanium alloy parts are widely used in industrial and agricultural engineering, and there are often strong shocks and vibrations during use. It will be affected by various friction factors, such as mining gears, bearings, agricultural machinery hammers, plowshares, etc. During the use of components, they are subjected to friction under load between parts or high-speed impact and wear of hard particles (sand, materials) in the environment, which causes severe wear on the surface of the components and changes the original design size. This will not only reduce the use effect of co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/66C23C8/64
Inventor 万强周航宇倪路昀李官正刘念
Owner HUAZHONG AGRI UNIV
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