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TiAl based alloy metallographic specimen corroding method

A technology of metallographic samples and base alloys, which is applied to the corrosion of TiAl-based alloy metallographic samples and the preparation of metallographic samples, can solve the problems that the TiAl-based alloy structure is difficult to display clearly, and achieve rich information inside the grain. Detailed, reproducible results with well-defined grain boundaries

Active Publication Date: 2012-04-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for corroding TiAl-based alloy metallographic samples that can clearly and comprehensively display the TiAl-based alloy metallographic structure, so as to solve the problem that the TiAl-based alloy structure is difficult to clearly display

Method used

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  • TiAl based alloy metallographic specimen corroding method
  • TiAl based alloy metallographic specimen corroding method
  • TiAl based alloy metallographic specimen corroding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Cut the sample from the hot isostatic pressed alloy prepared by powder metallurgy method, prepare a qualified metallographic sample according to the standard method, and then immerse the above sample in the electrolytic solution for electrolysis corrosion. The electrolytic solution contains 30mL of hydrofluoric acid (HF), 10g of boric acid (H 3 BO 3 ), the balance is distilled water. The selected electrolytic voltage was 16V, and the electrolytic corrosion time was 40s. Immediately after electrolytic corrosion, it was washed with clean water and dried; the bright field image was observed on an ordinary optical metallographic microscope, and the attached figure 1 When the magnification is 500×, the clear and beautiful metallographic structure picture is obtained.

Embodiment 2

[0032] Cut the sample from the cast alloy whose composition is Ti-47Al-2Cr-0.2Mo prepared by the vacuum induction arc melting method, prepare a qualified metallographic sample according to the standard method, and then immerse the above sample in the electrolytic solution for electrolytic corrosion . The electrolytic solution contains 40mL of hydrofluoric acid (HF), 11g of boric acid (H 3 BO 3 ), the balance is distilled water. The selected electrolytic voltage was 16V, and the electrolytic corrosion time was 120s. Immediately after electrolytic corrosion, it was washed with water and dried; the bright field image was observed on an ordinary optical metallographic microscope, and the attached figure 2 When the magnification is 500×, the clear and beautiful metallographic structure picture is obtained.

Embodiment 3

[0034] Cut the sample from the forging cake material whose composition is Ti-47Al-2Cr-0.2Mo alloy under the condition of 1200 ℃, and the total deformation deformation is 70%, prepare a qualified metallographic sample according to the standard method, and then The above samples were immersed in electrolytic solution for electrolytic corrosion. The electrolytic solution contains 35mL of hydrofluoric acid (HF), 11g of boric acid (H 3 BO 3 ), the balance is distilled water. The selected electrolytic voltage was 16V, and the electrolytic corrosion time was 120s. Immediately after electrolytic corrosion, it was washed with water and dried; the bright field image was observed on an ordinary optical metallographic microscope, and the attached image 3 When the magnification is 500×, the clear and beautiful metallographic structure picture is obtained.

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Abstract

The invention provides a TiAl based alloy metallographic specimen corroding method. The method comprises the following steps: kibbling and polishing a TiAl based alloy specimen on silicon carbide paper, and then carrying out electrolytic corrosion, wherein the metallographic specimen to be observed is utilized as an anode, a stainless steel sheet is utilized as a cathode, an electrolytic corrosion solution is utilized as a conducting medium, the electrolytic corrosion voltage is 15-18V, and the electrolytic corrosion time is 30-240s; then washing clean and blow-drying; and observing a clear TiAl based alloy microscopic structure under an ordinary light microscope bright field image condition. The method provided by the invention has the advantages of solving the problem of difficulty in display of the TiAl based alloy metallurgical structure, enabling the to-be-observed surface of the specimen to form megascopic color, integrally and clearly displaying TiAl based alloy structures in different states, obtaining clear and beautiful images by virtue of observation under an ordinary optical metalloscope, enabling grain boundaries in the alloy to be clear and visible and integrally displaying the internal structure characteristics of grains. The method is simple and convenient to implement and does not need special equipment. Compared with other chemical metallographical corroding methods, the method provided by the invention has the advantages of easily controlled conditions, simplicity in operation and good experiment repeatability.

Description

technical field [0001] The invention relates to a method for preparing a metallographic sample for observing the metallographic microstructure of a TiAl-based alloy, in particular to a method for corroding a TiAl-based alloy metallographic sample. It belongs to the technical field of metallographic sample preparation. Background technique [0002] TiAl-based alloy is an intermetallic compound. Because of its high specific strength, specific stiffness, good creep resistance and corrosion resistance, it is recognized as the most promising new lightweight high-temperature material. It has broad application prospects in the fields of automobiles, national defense and military industry. [0003] As we all know, the organization of materials has a great influence on its performance, so research related to materials science must carry out corresponding detection and analysis on the organization of materials. TiAl-based alloys usually contain three phases, namely: α / α 2 phase, β / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
Inventor 李慧中曾敏刘咏梁霄鹏宋阳黄伯云
Owner CENT SOUTH UNIV
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