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Method for displaying boride in gamma-TiAl-based alloy

A display method and alloy-based technology, which is applied in the preparation, sampling, and measuring devices of test samples, can solve the problems of low color contrast and difficulty in distinguishing between borides and γ-phase substrates, and achieve easy control of experimental conditions and low cost. Inexpensive, easy to operate effect

Inactive Publication Date: 2021-04-13
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the shortcomings of the existing metallographic corrosion technology of borides in γ-TiAl-based alloys, the purpose of the present invention is to provide a method for displaying borides in metallographic samples of γ-TiAl-based alloys, which can quickly, clearly and completely display γ -The metallographic structure of boride morphology and distribution in TiAl-based alloys to solve the problem of small color contrast between borides and γ-phase matrix in γ-TiAl-based alloys Provide a technical basis for the regulation of appearance and distribution

Method used

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  • Method for displaying boride in gamma-TiAl-based alloy
  • Method for displaying boride in gamma-TiAl-based alloy

Examples

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Embodiment 1

[0041] In this example, the Ti-45Al-2Nb-2Mn-1B alloy was centrifugally cast by vacuum induction shell melting, the casting was cut after hot isostatic pressing, ground and polished according to the conventional metallographic sample preparation process, and the sample was washed and dried , Connect the DC power supply and immerse the anode in the electrolytic corrosion agent for electrolytic corrosion. Each 1L of electrolytic etchant contains 20g of NaOH, and the balance is deionized water. The selected electrolytic voltage is 30V, and the electrolytic corrosion time is 10s. Immediately after electrolytic corrosion, wash and dry with water and alcohol; image 3 As shown, when the bright field image is observed on an ordinary optical metallographic microscope with a magnification of 500×, the color of the boride obtained at the thin-walled position of the casting is obviously different from the metallographic structure image of the matrix; as shown Figure 5 As shown, when the...

Embodiment 2

[0048] In this example, the Ti-43.5Al-4Nb-1Mo-0.5B alloy was centrifugally casted by vacuum induction shell melting. After hot isostatic pressing, the samples were cut and polished according to the conventional metallographic sample preparation process, and the samples were washed. After cleaning and drying, connect the DC power supply and immerse the anode in the electrolytic corrosion agent for electrolytic corrosion. Each 1L of electrolytic etchant contains 30g of NaOH, and the balance is deionized water. The selected electrolytic voltage is 25V, and the electrolytic corrosion time is 20s, after which it is immediately washed with clean water and dried; Image 6 As shown, bright-field image observation was carried out on an ordinary optical metallographic microscope. When the magnification is 500×, the color of the boride obtained at the thin-walled position of the casting is obviously different from the metallographic structure of the matrix; Figure 7 As shown, when the...

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Abstract

The invention relates to a method for displaying boride in gamma-TiAl-based alloy, and belongs to the technical field of observation of internal organizational structures of materials. A TiAl alloy sample containing an element B is sequentially subjected to rough grinding and fine grinding by using different numbers of waterproof abrasive paper, and is cleaned and blow-dried after being polished to a mirror surface. A metallographic sample to be observed is connected with an anode, a pure titanium sheet is connected with a cathode, the product is immersed into a metallographic electrolytic corrosive agent for electrolytic corrosion, wherein the temperature of the electrolytic corrosive agent is room temperature, the electrolytic corrosion voltage is 15-35 V, and the electrolytic corrosion time is 10-20 s; and then cleaning and blow-drying are conducted. A red boride metallographic microstructure obviously different from a light red gamma-phase matrix can be observed by adopting a bright field image of a conventional optical metallographic microscope. According to the method, the problems that fine boride in the metallographic structure of the gamma-TiAl-based alloy cannot be distinguished and the shape and size are difficult to count are solved, scientific researchers can easily regulate and control the shape and size of the boride, and research and production of the gamma TiAl-based alloy and components of the gamma TiAl-based alloy are promoted.

Description

technical field [0001] The invention relates to a method for displaying borides in γ-TiAl-based alloys, and belongs to the technical field of observation of internal structure of materials. Background technique [0002] γ-TiAl-based alloy is a light-weight intermetallic compound with high specific strength, high specific modulus, good high-temperature creep resistance and oxidation resistance, and is recognized as a light-weight high-temperature structural material with the best application prospects. It has been applied to the last two-stage low-pressure turbine blades of General Electric's new aero-engine GEnx, and it has broader application prospects in high-temperature structural components in aerospace, high-end automobiles, national defense and military industries. [0003] The applied second-generation γ-TiAl alloy Ti-48Al-2Nb-2Cr lamellar grain size is coarse, and it is necessary to refine the lamellar grain size through complex and long-term heat treatment to improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32G01N21/84
CPCG01N1/28G01N1/286G01N1/32G01N21/84G01N2001/2866
Inventor 刘仁慈曹如心王鹏崔玉友杨锐杨超李继保单志强倪明杰刘冬
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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