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Etchant for displaying metallographic structure of nickel-based high temperature alloy and method

A technology of nickel-based superalloy and metallographic structure, which is applied in the field of metallographic sample preparation and display, can solve the problems of inability to obtain three-dimensional images of carbides, skin corrosion, complicated storage of reagents, etc., and achieves reliable and three-dimensional composition test results. Strong sense, convenient three-dimensional form effect

Active Publication Date: 2015-03-11
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Reagents ① and ② are chemical etching agents, and these two etching agents are mainly to be analyzed The phase corrodes away, leaving the matrix phase, which cannot reach the real analysis Phase purposes, nor can a 3D image of the carbide
Moreover, hydrofluoric acid is highly volatile and has a strong corrosive effect on the skin, and the storage of reagents is complicated
Reagents ③ and ④ are electrolytic corrosion agents. Reagent ③ needs to be electrolyzed at minus 5 to minus 15 degrees Celsius, which has strict requirements on temperature. Chromium trioxide in reagent ④ is a highly toxic drug, which can cause acute respiratory tract damage through inhalation or contact with the skin. Irritation symptoms, nasal mucosal atrophy, and asthma are all very harmful to human health and the environment; in addition, it should be noted that the introduction of metal ion chromium will affect the composition analysis of the phase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In this specific embodiment, it is shown that the nickel-based superalloy The etchant used in the first phase is a mixed solution of sulfuric acid and methanol, and the mass percentage of each component is: sulfuric acid 30: methanol 70. The preparation method of etching agent 1 is as follows: take a beaker, pour an appropriate amount of methanol, slowly pour sulfuric acid into the methanol, and at the same time stir and mix evenly with a glass rod.

[0050] In this specific embodiment, the second etchant used to display the carbide phase of the nickel-based superalloy is a mixed solution of phosphoric acid, sulfuric acid and hydrogen peroxide, and the mass percentage of each component is: phosphoric acid 75: sulfuric acid 15: hydrogen peroxide 10. The preparation method of etching agent 2 is as follows: take another beaker, pour an appropriate amount of phosphoric acid, slowly pour the sulfuric acid into the phosphoric acid, and stir and mix evenly; finally add an appr...

Embodiment 2

[0060] In this specific embodiment, it is shown that the nickel-based superalloy The etchant used in the first phase is a mixed solution of sulfuric acid and methanol, and the mass percentage of each component is: sulfuric acid 40: methanol 60.

[0061] In this specific embodiment, the second etchant used to display the carbide phase of the nickel-based superalloy is a mixed solution of phosphoric acid, sulfuric acid and hydrogen peroxide, and the mass percentage of each component is: phosphoric acid 65: sulfuric acid 20: hydrogen peroxide 15.

[0062] In this specific embodiment, the specific steps of the method used to display the metallographic structure of the nickel-based superalloy are as follows:

[0063] (1) Polish the nickel-based superalloy sample;

[0064] (2) Place the stainless steel sheet flat on the bottom of the beaker and connect it to the cathode, put the polished surface of the nickel-based superalloy sample down, put the corrosive agent 1, and connect th...

Embodiment 3

[0071] In this specific embodiment, it is shown that the nickel-based superalloy The etchant used in the first phase is a mixed solution of sulfuric acid and methanol, and the mass percentage of each component is: sulfuric acid 45: methanol 55.

[0072] In this specific embodiment, the second etchant used to display the carbide phase of the nickel-based superalloy is a mixed solution of phosphoric acid, sulfuric acid and hydrogen peroxide, and the mass percentage of each component is: phosphoric acid 75: sulfuric acid 10: hydrogen peroxide 15.

[0073] In this specific embodiment, the specific steps of the method used to display the metallographic structure of the nickel-based superalloy are as follows:

[0074] (1) Polish the nickel-based superalloy sample;

[0075] (2) Place the stainless steel sheet flat on the bottom of the beaker and connect it to the cathode, put the polished surface of the nickel-based superalloy sample down, put the corrosive agent 1, and connect the...

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PUM

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Abstract

The invention provides an etchant for displaying the metallographic structure of a nickel-based high temperature alloy. The metallographic structure to be observed of the nickel-based high temperature alloy comprises a gamma' phase and a carbide phase; the etchant I for displaying the gamma' phase of the nickel-based high temperature alloy comprises the following components in percentage by weight: 30 to 45 percent of sulfuric acid, and 55 to 70 percent of methanol; the etchant II for displaying the carbide phase of the nickel-based high temperature alloy comprises the following components in percentage by weight: 10 to 20 percent of sulfuric acid, 5 to 15 percent of hydrogen peroxide, and the balance of phosphoric acid; and the etchant II acts on the nickel-based high temperature alloy using the etchant I. The gamma' phase is clear in grain boundary and high in contrast with the surrounding, and facilitates quantitative analysis of volume fraction; the carbide is clear in boundary and strong in third dimension, facilitates observing three-dimensional form and realizes quantitative metallographic analysis; and metallic chromium ions do not exist in the prepared etchant, so the component test result is reliable, and the etchant can be stored for a long term and reused and is wide in electrolysis parameter range, convenient to operate and easy to control.

Description

technical field [0001] The invention relates to the technical field of metallographic sample preparation and display, in particular to a preparation and electrolytic erosion specification of an etchant used for displaying the metallographic structure of a nickel-based superalloy. Background technique [0002] Due to the complex composition of nickel-based superalloys, various processes, and various types of alloy phases, various phase transitions will inevitably occur, and many different phases and structures will be produced due to phase transitions, so as to understand and master the influence of these phases and structures on the mechanical properties of the alloy. In order to control the phase transformation and phase transformation process, the superalloy can get the best microstructure and the best comprehensive mechanical properties. For nickel-based superalloys, the strengthening phase is mainly Therefore, to understand the relationship between these phases and me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32
Inventor 徐永锋高振桓杨明陈巳漪
Owner DONGFANG TURBINE CO LTD