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Titanium alloy surface treatment method

A surface treatment, titanium alloy technology, applied in the field of material science, can solve problems such as difficult to accurately control the thickness of the deformed layer, inability to process, multi-work hardening and residual stress, so as to avoid unreasonable treatment process and improve surface wear resistance , cost reduction effect

Active Publication Date: 2022-05-10
HUNAN JINTIAN ALUMINUM HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional process for nano-izing the surface of titanium alloy is shot peening or ball milling, but these two surface processing processes belong to large-scale surface processing, and it is impossible to process selected areas, and it is difficult to accurately control the thickness of the deformed layer.
Moreover, after a single surface plastic deformation treatment is performed on the titanium alloy, more work hardening and residual stress are likely to exist on the surface.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0043] This embodiment provides a method for surface treatment of titanium alloys. Take a TC4 titanium alloy workpiece, and use a WC / Co hemispherical tool to carry out surface mechanical grinding treatment (SMGT treatment) on the workpiece. The grinding speed is 0.2m / s, and each pass presses The reduction is 30 μm, the grinding passes are 8 times, the total reduction is 240 μm, and the total depth of the deformed layer is about 60 μm. The metallographic structure after treatment is shown in Figure 1(a) and Figure 1(b). Among them, Figure 1(a) is the matrix structure of TC4 titanium alloy, and Figure 1(b) is the structure treated with SMGT.

[0044]It can be seen from Fig. 1(a) and Fig. 1(b) that the area of ​​the above TC4 titanium alloy after SMGT treatment presents nanometer-sized grain layer, submicron-sized grain layer, deformed grain layer and initial grain layer in sequence along the pressing direction. The gradient structure of the granular tissue layer. The thickness...

Embodiment 2

[0046] The difference between this embodiment and Embodiment 1 is that the grinding passes are 10 times, the total reduction is 300 μm, and the total depth of the deformed layer is about 90 μm. according to figure 2 As shown, the area of ​​the above TC4 titanium alloy after SMGT treatment presents a gradient structure of nanometer-sized grain layer, submicron-sized grain layer, deformed grain layer and initial grain structure layer along the pressing direction. The thickness of the nano-sized grain layer is about 20 μm, the thickness of the sub-micron-sized grain layer is about 30 μm, and the thickness of the deformed grain layer is about 40 μm. The thickness of the grinding layer in this embodiment is large and uniform.

Embodiment 3

[0048] The difference between this embodiment and Embodiment 1 is that the grinding passes are 12 times, and the total reduction is 360 μm. according to image 3 As shown, when the total reduction is too large, the surface of TC4 titanium alloy is damaged and peeled off, and the deformation layer and grain refinement layer cannot be observed, and the titanium alloy matrix is ​​underneath the peeled off layer.

[0049] It can be seen from the above examples 1 to 3 that when the grinding speed and the reduction of each pass are constant, the thickness of the total deformed layer increases continuously with the increase of the total reduction. However, when the total reduction is too large, the surface of TC4 titanium alloy may be damaged during the grinding process ( image 3 ).

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Abstract

The invention discloses a titanium alloy surface treatment method, which uses a hemispherical cutter to carry out surface mechanical grinding treatment on a selected area of ​​titanium alloy, and then infiltrates the titanium alloy which has undergone surface mechanical grinding treatment in the selected area at 800°C to 1000°C. Carbon 4 to 10 hours. The present invention adopts the SMGT+low-temperature carburizing process to first form a thicker and more uniform grain deformation layer on the surface of the titanium alloy, which provides a channel for the diffusion of carbon atoms in the carburizing step, and improves the thickness and uniformity of the carburizing layer, thereby Improve its surface wear resistance; secondly, the titanium alloy treated with SMGT can reduce the carburizing temperature and shorten the carburizing time, the carburizing depth is deeper, and the wear resistance is better, which improves the product preparation efficiency and reduces the cost.

Description

technical field [0001] The invention relates to the technical field of material science, and more specifically relates to a method for treating the surface of a titanium alloy. Background technique [0002] Due to its high specific strength, corrosion resistance and biocompatibility, titanium alloys have been widely used in the fields of aerospace, chemical petroleum, biomedical materials and sporting goods. However, there are also some disadvantages, such as poor wear resistance and high preparation costs. [0003] In recent years, titanium alloys have been used more and more widely in non-aviation fields. In order to improve the wear resistance of titanium alloys, researchers have conducted a lot of research on the surface treatment of titanium alloys. Surface coating and modification methods are usually used to improve the wear resistance of titanium alloys. Increase the high hardness and wear resistance of the titanium alloy surface. The traditional surface treatment t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/02C23C8/44C23C8/80C22F1/18
CPCC23C8/02C23C8/44C23C8/80C22F1/183
Inventor 邱敬文刘春轩谢屹蒋兆汝罗任张杰伍智敏吴云张扬邱振宇
Owner HUNAN JINTIAN ALUMINUM HI TECH CO LTD
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