CN110592579A - TC4 titanium alloy surface electric spark composite strengthening process - Google Patents

TC4 titanium alloy surface electric spark composite strengthening process Download PDF

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Publication number
CN110592579A
CN110592579A CN201910902451.7A CN201910902451A CN110592579A CN 110592579 A CN110592579 A CN 110592579A CN 201910902451 A CN201910902451 A CN 201910902451A CN 110592579 A CN110592579 A CN 110592579A
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CN
China
Prior art keywords
strengthening
discharge
powder
titanium alloy
electric spark
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910902451.7A
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Chinese (zh)
Inventor
蔡兰蓉
赵俊领
刘士杰
李敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin University of Technology and Education China Vocational Training Instructor Training Center
Original Assignee
Tianjin University of Technology and Education China Vocational Training Instructor Training Center
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Publication date
Application filed by Tianjin University of Technology and Education China Vocational Training Instructor Training Center filed Critical Tianjin University of Technology and Education China Vocational Training Instructor Training Center
Priority to CN201910902451.7A priority Critical patent/CN110592579A/en
Publication of CN110592579A publication Critical patent/CN110592579A/en
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
    • C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
    • C23C24/106—Coating with metal alloys or metal elements only

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The invention relates to a TC4 titanium alloy surface electric spark composite strengthening process, which solves the problems that after the first discharge strengthening is finished, the surface of a strengthening layer has a large and deep discharge corrosion pit, and obvious splash particles, cavities, cracks and other defects exist around the corrosion pit, fills the defects of microcracks and pores generated by the first discharge, reduces the surface roughness of the strengthening layer, increases the types of strengthening phases, greatly improves the hardness, wear resistance, thermal stability and chemical stability of the strengthening layer, effectively inhibits the further extension and expansion of the cracks, and achieves the purpose of strengthening the surface of a material. The method is characterized in that: and changing one or more of the reinforced powder material, the electrode polarity, the pulse width and the peak current, and performing secondary discharge reaction or multiple discharge reactions on the surface of the workpiece after the discharge reaction is reinforced. A strengthening medium phase with high hardness and high wear resistance is generated on the surface of the alloy.

Description

TC4 titanium alloy surface electric spark composite strengthening process
Technical Field
The invention relates to a TC4 titanium alloy surface electric spark composite strengthening process, and belongs to the technical field of special machining.
Background
The TC4 titanium alloy has the characteristics of high specific strength, small density, high melting point and the like, is widely applied to the manufacturing process of aerospace engines and airframes, but has the defects of low hardness, poor wear resistance and the like due to the material, so that the application range of the TC4 titanium alloy is further expanded. In contrast, a great deal of research is carried out by domestic and foreign scholars, and the electric spark surface strengthening technology can effectively improve the surface hardness and the wear resistance of the TC4 titanium alloy, wherein the mixed powder quasi-dry type electric spark surface strengthening technology has the best effect. However, the surface strengthening technology still has many disadvantages, such as the surface of the strengthened layer has high roughness due to the large and deep electrical discharge pits, raised molten cooling substances, splashed molten drops and residual powder particles generated by the electrical discharge action, which affects the surface smoothness of the strengthened layer. Meanwhile, the surface of the strengthening layer has more defects such as air holes, cracks and the like, and the service life of the strengthening layer is reduced to a certain extent. Although the strengthening effect of the surface strengthening technology is obviously improved compared with other strengthening means, the defects still need to find a better processing technology to perfect.
Disclosure of Invention
The invention aims to solve various defects existing in the surface of a strengthening layer in the process of strengthening TC4 on the surface of an electric spark in the prior art, and provides a TC4 titanium alloy surface electric spark composite strengthening process.
The invention relates to a TC4 titanium alloy surface electric spark composite strengthening process, which comprises the following steps:
(1) spraying the deionized water solution mixed with the strengthening medium powder material between a tool electrode and a workpiece electrode of the electric spark forming machine tool in a mist form, and melting the workpiece material, the electrode material and the strengthening powder medium material and carrying out a series of physical and chemical reactions with each other by high temperature generated by discharge between the two electrodes to generate a layer of new strengthening phase structure to cover the surface of the workpiece material.
(2) And (3) changing one or more of the strengthening powder material, the electrode polarity, the pulse width and the peak current, and carrying out secondary discharge reaction on the surface of the workpiece strengthened by the discharge reaction in the step (1).
The process has the advantages of flexible selectivity and the like, and because the secondary discharge strengthening is adopted, after the primary discharge strengthening is finished, the surface of the strengthening layer has large and deep discharge corrosion pits, and the periphery of the corrosion pits has obvious defects of splashing particles, cavities, cracks and the like. The second discharge hot melting strengthening process further refines the structure of the strengthening layer, fills up the defects of microcracks and pores generated by the first discharge, reduces the surface roughness of the strengthening layer, increases the types of strengthening phases, greatly improves the hardness, wear resistance, thermal stability and chemical stability of the strengthening layer, and effectively inhibits the further extension and expansion of cracks.
Detailed Description
The first embodiment is as follows: al powder is taken as a strengthening medium material to be fully mixed with deionized water, the mixture is sprayed between a graphite electrode of an electric spark forming machine tool and TC4 titanium alloy in a mist form, the electric discharge machining is carried out under the conditions of peak current of 6.6A, pulse width of 80 mu s and negative polarity, and the machining depth is 0.2 mu m. After the discharge machining is finished, keeping other parameters unchanged, and adopting B4C or B4The C + Al powder is subjected to secondary or multiple discharge machining, the machining depth is 0.1 mu m, so that a layer of strengthening medium phase with high hardness and high wear resistance is formed on the surface of the TC4 titanium alloy, and the purpose of surface strengthening is achieved.
The second embodiment is as follows: the present embodiment is different from the present embodiment in that the order of combining the two types of discharge enhancing media may be B4C powder → Al powder, Al powder → B powder4C powder, B4C powder → Al + B4C mixing the powder, and other steps and parameters are the same as those of the first embodiment.
The third concrete implementation mode: the difference between this embodiment and the specific embodiment is that the two discharge intensification peak current combination orders may beI p=6.6 A→I p=8.2 A、I p=8.2 A→I p= 6.6A, and other steps and parameters are the same as in the first embodiment.
The fourth concrete implementation mode: the difference between this embodiment and the embodiment is that the two-time discharge enhancing electrode type combination sequence may be red copper positive polarity → graphite negative polarity, graphite positive polarity → graphite positive polarity, tungsten electrode negative polarity → graphite negative polarity, and other steps and parameters are the same as those in the first embodiment.
The fifth concrete implementation mode: the difference between this embodiment and the specific embodiment is that the two discharge enhancement pulse width combination orders may bet on=80μs→t on=100μs、t on=60μs→t on=100 μ s, and the other steps and parameters are the same as those in the first embodiment.

Claims (6)

1. The TC4 titanium alloy surface electric spark composite strengthening process is characterized by comprising the following steps:
(1) spraying a deionized water solution mixed with a strengthening medium powder material between a tool electrode and a workpiece electrode of an electric spark forming machine tool in a mist form, wherein the workpiece material, the electrode material and the strengthening powder medium material are melted and mutually subjected to a series of physical and chemical reactions by high temperature generated by discharge between the two electrodes to generate a layer of new strengthening phase structure to cover the surface of the workpiece material;
(2) and (2) changing one or more of the strengthening powder material, the electrode polarity, the pulse width and the peak current, and carrying out secondary discharge reaction or multiple discharge reactions on the surface of the workpiece strengthened by the discharge reaction in the step (1).
2. The TC4 titanium alloy surface electric spark composite strengthening process as claimed in claim 1, wherein the first electric discharge machining depth is 0.2mm, and the second electric discharge machining depth is 0.1 mm.
3. The TC4 titanium alloy surface spark-erosion composite strengthening process of claim 1, wherein the two discharge strengthening electrode types are selected from the group consisting of positive polarity of red copper → negative polarity of graphite, positive polarity of graphite → positive polarity of graphite, and negative polarity of tungsten electrode → negative polarity of graphite.
4. The TC4 titanium alloy surface electric spark composite strengthening process as claimed in claim 1, wherein the two-time discharge strengthening peak current combination sequence isI p=6.6 A→I p=8.2 A、I p=8.2 A→I p=6.6 A。
5. The TC4 titanium alloy surface electric spark composite strengthening process as claimed in claim 1, wherein the two discharge strengthening pulse width combination sequence ist on=80μs→t on=100μs、t on=60μs→t on=100μs。
6. The TC4 titanium alloy surface electric spark composite strengthening process as claimed in claim 1, wherein the two discharge strengthening medium species combination order is B4C powder → Al powder, Al powder → B powder4C powder, B4C powder → Al + B4And C, mixing the powder.
CN201910902451.7A 2019-09-24 2019-09-24 TC4 titanium alloy surface electric spark composite strengthening process Pending CN110592579A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910902451.7A CN110592579A (en) 2019-09-24 2019-09-24 TC4 titanium alloy surface electric spark composite strengthening process

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113528994A (en) * 2021-07-14 2021-10-22 燕山大学 Titanium alloy surface antifriction and wear-resistant modification process

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102560327A (en) * 2011-10-13 2012-07-11 天津职业技术师范大学 Method for enhancing surface of powder-mixed near dry electrical discharge
CN102644075A (en) * 2012-05-17 2012-08-22 天津职业技术师范大学 Preparation process for electrospark surface strengthening on excellent surface quality of titanium alloy TC4
CN102703845A (en) * 2012-05-17 2012-10-03 天津职业技术师范大学 Technology for strengthening high surface hardness of TC4 titanium alloy by electrical spark

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102560327A (en) * 2011-10-13 2012-07-11 天津职业技术师范大学 Method for enhancing surface of powder-mixed near dry electrical discharge
CN102644075A (en) * 2012-05-17 2012-08-22 天津职业技术师范大学 Preparation process for electrospark surface strengthening on excellent surface quality of titanium alloy TC4
CN102703845A (en) * 2012-05-17 2012-10-03 天津职业技术师范大学 Technology for strengthening high surface hardness of TC4 titanium alloy by electrical spark

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘士杰: "影响准干式电火花强化层裂纹的关键性因素研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113528994A (en) * 2021-07-14 2021-10-22 燕山大学 Titanium alloy surface antifriction and wear-resistant modification process

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