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Technology for strengthening high surface hardness of TC4 titanium alloy by electrical spark

A technology of titanium alloy and electric spark, applied in the field of strengthening process of TC4 titanium alloy, can solve the problem of low hardness value, achieve the effect of easy operation, avoid fire hazard and green processing

Inactive Publication Date: 2012-10-03
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the hardness value of the TC4 titanium alloy surface is still low after surface strengthening in the prior art, and to provide an electric spark strengthening process that can effectively improve the high hardness of the TC4 titanium alloy surface

Method used

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specific Embodiment approach 2

[0009] Embodiment 2: The difference between this embodiment and embodiment 1 is that the powder material mixed in step 1 is B with a particle size of 7 μm 4 C powder. Other steps and parameters are the same as in the first embodiment.

[0010] A uniform and dense chrysanthemum petal-like strengthening layer is formed on the surface of the TC4 titanium alloy prepared in this embodiment, and the surface hardness test value is as high as 1174HV. Compared with the original TC4 titanium alloy without surface strengthening of 300HV, the surface hardness is increased by 874HV by 290%.

specific Embodiment approach 3

[0011] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 is that the powder material mixed in step 1 is B with a particle size of 7 μm. 4 The mixed powder of C and C powder with a particle size of 2.6 μm, the ratio is 1:1. Other steps and parameters are the same as in the first embodiment.

[0012] A layer of uniform and dense chrysanthemum petal-like strengthening layer is formed on the surface of the TC4 titanium alloy prepared in this embodiment, and the surface hardness test value is as high as 1382HV. The surface hardness of the original TC4 titanium alloy without surface strengthening is increased by 874HV, which is 360%.

specific Embodiment approach 4

[0013] Embodiment 4: The difference between this embodiment and Embodiment 1 is that the processing depth h=0.2 mm in step 4, and other steps and parameters are the same as Embodiment 1.

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Abstract

The invention discloses a method for improving surface hardness of a TC4 titanium alloy and relates to a method for strengthening the surface of the TC4 titanium alloy by electrical spark, belonging to the technical field of nontraditional machining. Different solid powder materials are added in a near-dry working medium to implement the technology for strengthening the high surface hardness of the TC4 titanium alloy. The method for improving the surface hardness of the TC4 titanium alloy is implemented by the following steps: the TC4 titanium alloy is strengthened by a powder-mixture near-dry electrical spark surface-strengthening method; and the solid powder materials mixed in the working medium respectively are C powder, B4C powder, and a mixture of the C powder and the B4C powder. Experiment parameters in the process of strengthening the surface by powder-mixture near-dry electrical spark are that the pulse interval toff is equal to 150Mus, the pulse width ton is equal to 150Mus, the pulse current ie is equal to 14A, the interelectrode discharge voltage is 120V, the machining depth h is equal to 0.1mm and a tool electrode used is graphite. The technology has the advantages that a strengthened layer and a matrix are combined well, the surface mechanical property is improved remarkably, and the like. The TC4 titanium alloy with the surface being strengthened by the method is up to 1382HV in microhardness, which is increased by 300% compared with that of the original alloy.

Description

Technical field [0001] The invention relates to a quasi-dry electric spark surface strengthening process by adding different solid powder materials to obtain a TC4 titanium alloy with high surface hardness. Background technique [0002] As a new type of structural material, titanium alloy has the advantages of light weight, high specific strength, and corrosion resistance. It has been widely used in the fields of metallurgy, machinery, chemical industry and aerospace. However, the shortcomings of titanium alloys such as low hardness and poor wear resistance have largely limited the further expansion of its application range. Researchers at home and abroad have carried out extensive application research on various surface strengthening technologies that give titanium alloys new properties to make up for their deficiencies. EDM surface strengthening is an important extension and expansion in the field of EDM micromachining. Through the transient discharge between the electrode and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22F3/00
Inventor 李敏蔡兰蓉杨慧马春雷
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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