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Chemical polishing agent and metallographic structure display method of titanium alloy

A metallographic structure display and chemical polishing technology, which is applied to the polishing composition containing abrasives, testing metals, scientific instruments, etc., can solve the problems of easy white film, blackening, and affecting the quality of observation, so as to optimize the grinding process , solve the effects of deformation twins and clear metallographic structure

Inactive Publication Date: 2020-11-20
沈阳中钛装备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the observation of the metallographic structure of titanium alloy is a difficult problem. The main reason is that the preparation of metallographic samples of titanium alloy is very difficult, the efficiency of grinding and polishing is very low, the corrosion is not easy to control, and white film or blackening is easy to appear. Affects the quality of observation or cannot be observed at all

Method used

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  • Chemical polishing agent and metallographic structure display method of titanium alloy
  • Chemical polishing agent and metallographic structure display method of titanium alloy
  • Chemical polishing agent and metallographic structure display method of titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1. Configure chemical polishing agent

[0058] by H 2 o 2 and SiO 2 Suspension composition, where, H 2 o 2 and SiO 2 The volume ratio of the suspension is 1:4.

[0059] 2. Metallographic structure display method of titanium alloy

[0060] Titanium alloy material: Ti-6.5Al-3.5Mo-1.5Zr-0.3Si

[0061] Brand: TC11

[0062] Heat treatment process: heating to 1015°C, holding for 35 minutes, water quenching.

[0063] Metallographic etchant: 4mL HF, 15mL HNO 3 , 81mL distilled water

[0064] β phase between acicular martensite and needles

[0065] The result is as Figure 2-3 As shown, the microstructure is maintained at a temperature above the β transformation point and rapidly cooled, that is, acicular martensite + β phase. The length and broadband of martensite are very clear, which is very conducive to the analysis of the structure and properties of materials. .

Embodiment 2

[0067] 1. Configure chemical polishing agent

[0068] by H 2 o 2 and SiO 2 Suspension composition, where, H 2 o 2 and SiO 2 The volume ratio of the suspension is 1:4.

[0069] 2. Metallographic structure display method of titanium alloy

[0070] Titanium alloy material: Ti-6.5Al-1Mo-1V-2Zr

[0071] Grade: TA15

[0072] Heat treatment process: hot rolled state

[0073] Metallographic etchant: 4mL HF, 15mL HNO 3 , 81mL distilled water

[0074] nascent α+β transition tissue

[0075] The result is as Figure 4-5 As shown, the microstructure is composed of equiaxed α phase + β transformation structure, and the content of equiaxed α phase is about 35%, which is a typical two-state structure.

Embodiment 3

[0077] 1. Configure chemical polishing agent

[0078] by H 2 o 2 and SiO 2 Suspension composition, where, H 2 o 2 and SiO 2 The volume ratio of the suspension is 1:4.

[0079] 2. Metallographic structure display method of titanium alloy

[0080] Titanium alloy material: Ti-4Al-22V

[0081] Grade: TB13

[0082] Heat treatment process: solid solution (ST)

[0083] Metallographic etchant: 20mL HF, 15mL HNO 3 , 65mL distilled water

[0084] single equiaxed beta tissue

[0085] The result is as Figure 6-7 As shown, the microstructure is equiaxed metastable β grains, and the grain boundaries appear clearly, which makes the grain size evaluation more accurate. According to the GBT 6394-2017 metal average grain size determination method, the grain size is rated as 9.3.

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Abstract

The invention discloses a chemical polishing agent and a metallographic structure display method of a titanium alloy. The chemical polishing agent is composed of H<2>O<2> and SiO<2> suspension in a volume ratio of (20-30): (70-80), the particle size and content of SiO<2> in the SiO<2> suspension are respectively 40-80 nm and lager than or equal to 30 wt%; and the metallographic structure display method of the titanium alloy comprises the following steps of preparing a titanium alloy sample, mechanically grinding the titanium alloy sample, mechanically polishing the titanium alloy sample by using the chemical polishing agent, and finally corroding the titanium alloy sample by using a metallographic corrosive. According to the chemical polishing agent and the metallographic structure displaymethod of the titanium alloy, the chemical polishing agent is used in cooperation with high polymer material synthetic leather polishing cloth, the mixing effect of mechanical polishing and chemicalpolishing can be achieved, an ideal titanium alloy metallographic specimen can be prepared, after corrosion, the metallographic structure is quite clear and free of interference phase, and observationof the titanium alloy metallographic structure is quite facilitated; and the problems that deformation twin crystals can be generated in an alpha phase and false phases are likely to occur through pure mechanical polishing are solved.

Description

technical field [0001] The invention belongs to the technical field of metallographic structure display of metal materials, and in particular relates to a chemical polishing agent and a method for displaying the metallographic structure of a titanium alloy. Background technique [0002] The internal structure of metal materials is directly and closely related to its material properties such as hardness, strength and ductility, and metallographic observation is the most direct and effective method to study the internal structure of metal materials. Metallography refers to the chemical composition of metals or alloys and the physical and chemical states of various components inside the metal or alloy. [0003] Metallographic observation is mainly to immerse the metal sample in a metallographic etchant to display the grain boundaries of the metal, and then use a metallographic microscope to observe the metallographic structure of the metal. The grain boundary is the interface ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F3/04C09G1/02G01N1/28G01N1/32G01N33/204
CPCC23F3/04C09G1/02G01N1/286G01N1/32G01N33/204G01N2001/2866G01N2001/2873
Inventor 王营闫振华
Owner 沈阳中钛装备制造有限公司
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