A kind of electrochemical etchant showing the metallographic structure of SLM formed in 718 nickel-based superalloy and its application method

A nickel-based superalloy, IN718 technology, applied in the field of electrochemical etchants, can solve the problems of difficult to grasp heating temperature and heating time, excessive metallographic corrosion, high risk of acidic corrosive liquid, etc., to facilitate accurate quantitative and process optimization analysis , obvious grain boundaries, simple formula effect

Active Publication Date: 2022-04-19
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the IN 718 nickel-based superalloy has a large amount of Ni and Cr elements, the surface of the material will be covered with a dense oxide film after forming and has strong corrosion resistance. The corrosion method cannot break the oxide film on the surface and corrode the metal phase (for example: aqua regia corrosion method (concentrated HCl and concentrated HNO 3 The mixed solution whose volume ratio is 3:1), three-acid solution corrosion method (the volume fraction ratio is 80% HCl, 13% HF, 7% HNO 3 mixed solution)), while the thermal chemical etching method formed by heating the etching solution on the basis of the cold chemical etching method can obtain the metallographic structure of the material (for example: 80mlHCl+4mlHNO 3 +1gCuCl+20ml glycerol, or 15mlHCl+15mlH 2 o 2 +1.5gCuSO 4 Heating in a water bath to 80°C to 90°C for 0.5 to 1 hour before corrosion), but because the heating temperature and heating time are difficult to grasp during the heating process, excessive metallographic corrosion is prone to occur, and at the same time, the volatility is unstable Acidic corrosive liquid has a high risk during heating, so an electrochemical etchant and its application method for displaying the metallographic structure of SLM-formed IN 718 nickel-based superalloy are now proposed

Method used

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  • A kind of electrochemical etchant showing the metallographic structure of SLM formed in 718 nickel-based superalloy and its application method
  • A kind of electrochemical etchant showing the metallographic structure of SLM formed in 718 nickel-based superalloy and its application method
  • A kind of electrochemical etchant showing the metallographic structure of SLM formed in 718 nickel-based superalloy and its application method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1) Preparation of electrolytic corrosion agent: pipette 10ml of perchloric acid solution and 90ml of absolute ethanol solution, and pour the perchloric acid solution into absolute ethanol solution at room temperature to prepare 100ml of mixed solution;

[0052] 2) Preparation of cold chemical etchant: pipette 8ml of concentrated nitric acid solution, 24ml of concentrated hydrochloric acid solution, slowly pour the concentrated nitric acid solution into the concentrated hydrochloric acid solution at room temperature and keep stirring to prepare 32ml of mixed solution;

[0053] 3) Select the top surface, bottom surface, and side surface of the SLM-molded IN 718 sample, and polish them with 100#, 320#, 600#, 800#, 1000#, 2000# and 3000# specifications of water-grinding sandpaper;

[0054] 4) Use a mechanical polishing machine to perform rough polishing and fine polishing on the top surface, bottom surface, and side surface of the shaped sample polished in step 3). The polis...

Embodiment 2

[0062] 1) Preparation of electrolytic corrosion agent: pipette 20ml of perchloric acid solution and 80ml of absolute ethanol solution, and pour the perchloric acid solution into the absolute ethanol solution at room temperature to prepare 100ml of mixed solution;

[0063] 2) Preparation of cold chemical etchant: pipette 10ml of concentrated nitric acid solution, 30ml of concentrated hydrochloric acid solution, slowly pour the concentrated nitric acid solution into the concentrated hydrochloric acid solution at room temperature and keep stirring to prepare 40ml of mixed solution;

[0064] 3) Select the top surface, bottom surface, and side surface of the SLM-molded IN 718 sample, and polish them with 100#, 320#, 600#, 800#, 1000#, 2000# and 3000# specifications of water-grinding sandpaper;

[0065]4) Use a mechanical polishing machine to perform rough polishing and fine polishing on the top surface, bottom surface, and side surface of the shaped sample polished in step 3). The p...

Embodiment 3

[0073] 1) Preparation of electrolytic corrosion agent: pipette 15ml of perchloric acid solution and 85ml of absolute ethanol solution, and pour the perchloric acid solution into absolute ethanol solution at room temperature to prepare 100ml of mixed solution;

[0074] 2) Preparation of cold chemical etchant: pipette 9ml of concentrated nitric acid solution, 27ml of concentrated hydrochloric acid solution, slowly pour the concentrated nitric acid solution into the concentrated hydrochloric acid solution at room temperature and keep stirring to prepare 36ml of mixed solution;

[0075] 3) Select the top surface, bottom surface, and side surface of the SLM-molded IN 718 sample, and polish them with 100#, 320#, 600#, 800#, 1000#, 2000# and 3000# specifications of water-grinding sandpaper;

[0076] 4) Use a mechanical polishing machine to perform rough polishing and fine polishing on the top surface, bottom surface, and side surface of the shaped sample polished in step 3). The polis...

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Abstract

The invention relates to the technical field of metallographic detection and analysis of high-temperature alloys. The invention discloses an electrochemical etchant for displaying the metallographic structure of SLM formed IN 718 nickel-based superalloy. The electrochemical etchant is composed of an electrolytic etchant and a cold chemical etchant, including the following Volume fraction of raw materials: electrolytic corrosion agent is perchloric acid 10 ~ 20ml, absolute ethanol 80 ~ 90ml; cold chemical corrosion agent is absolute alcohol 30 ~ 40ml, deionized water 30 ~ 40ml, concentrated nitric acid 8 ~ 10ml, concentrated hydrochloric acid 24 ~ 30ml. The electrochemical etchant of the invention is convenient to configure, and the corrosion steps are easy to operate, which not only reduces the risk of thermochemical corrosion, but also greatly improves the corrosion effect under the premise of ensuring the corrosion quality.

Description

technical field [0001] The invention relates to the technical field of metallographic detection and analysis of superalloys, in particular to an electrochemical etchant for displaying the metallographic structure of SLM formed IN 718 nickel-based superalloys and a method for using the same. Background technique [0002] IN 718 alloy (international designation: NiCr19Fe19Nb5Mo3), as a precipitation-strengthened nickel-based deformed alloy, uses "solid solution strengthening" to precipitate the γ' phase (Ni 3 (Al,Ti,Nb)) and the body-centered tetragonal γ″ phase (Ni 3 Nb) as the main strengthening phase, on the one hand, by combining the characteristics of dispersed and uniform nucleation, coherent, fine particles and small spacing, and low phase interface energy due to the small mismatch between the γ' phase and the matrix lattice, the IN The 718 alloy has high yield, high toughness, high fatigue resistance, and high creep resistance. On the other hand, it has a non-coherent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/02C23F1/28G01N1/32
CPCC25F3/02C23F1/28G01N1/32
Inventor 黄亮曹岩贾峰穆瑞元高续森党云鹏
Owner XIAN TECH UNIV
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