Metallographic etchant capable of clearly displaying delta phase in GH4169 alloy and application method

A GH4169, clear display technology, applied in the preparation of test samples, instruments, analytical materials, etc., can solve the problems of no patents or documents found, and achieve the effect that the δ phase has a clear appearance and is suitable for analysis and research

Inactive Publication Date: 2019-11-15
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on the novelty search results of patent databases and domestic and foreign literatures, no patents

Method used

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Examples

Experimental program
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Example Embodiment

[0032] Example one

[0033] A metallographic corrosive that clearly shows the delta phase in GH4169 alloy and its use method, the steps are as follows: sample cutting preparation. A wire cutting machine is used to cut the GH4169 alloy sample into a size range (length×width×height) of (12mm×12mm×8mm). The edges of the sample are chamfered by a grinding wheel; the sample is ground and polished. The metallographic sandpaper with a particle size of 400 mesh is used for rough grinding in running water through a grinder; then it is finely ground with 600 mesh and 800 mesh sandpaper, and finally finer with 1000 mesh sandpaper. After grinding in one direction, change to a finer grade of sandpaper for grinding and rotate the sample angle by 90° to eliminate the grinding scratches of the previous coarse sandpaper. After grinding with sandpaper, polish the observation surface of the metallographic sample with a polishing machine and a grinding paste with a particle size of 3 microns until ...

Example Embodiment

[0034] Example two

[0035] A metallographic corrosive that clearly shows the delta phase in GH4169 alloy and its use method, its characteristic steps are as follows: sample cutting preparation. The GH4169 alloy sample was cut into a size range (length×width×height) (10mm×10mm×15mm) with a wire cutting machine, and the edge of the sample was chamfered by a grinding wheel; the metallographic sandpaper with a particle size of 400 mesh was used by the grinding machine. Coarse grinding is carried out in flowing water; then fine grinding is performed with 500 mesh and 800 mesh sandpaper, and finally fine grinding with 1000 mesh sandpaper. After grinding in one direction, change to a finer grade of sandpaper for grinding and rotate the sample angle by 90 degrees to eliminate the grinding scratches of the previous grade of coarse sandpaper. After grinding with sandpaper, polish the observation surface of the metallographic sample with a polishing machine and a grinding paste with a par...

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Abstract

The invention belongs to the technical field of advanced deformed superalloy materials and metallographic analysis and relates to a metallographic etchant capable of clearly displaying a delta phase in a GH4169 alloy and an application method. The etchant is prepared from the following main components of 50-55g of copper chloride, 100-120ml of concentrated hydrochloric acid, 1-3ml of concentratedsulfuric acid and 90-110ml of methanol. The method is characterized by comprising the following steps of grinding and polishing a deformed superalloy sample; preparing an etchant; mixing the etchant;adjusting and controlling the temperature; carrying out etching; cleaning the sample by using flowing clear water; drying the etched surface of the sample with hot air; and observing a delta phase through a metallographic microscope. The etchant provided by the invention is simple and convenient to prepare, the delta phase in the GH4169 alloy can be quickly displayed, the etching effect is good, display of the delta phase is clear, the phenomenon of overetching or uneven etching is avoided, and the metallographic etchant is very suitable for evaluation of the metallurgical quality of GH4169 alloy bars and forging and analysis of the metallurgical defects.

Description

Technical field: [0001] The patent of the invention belongs to the technical field of advanced deformed superalloy materials and metallographic analysis, and relates to a metallographic etchant that clearly shows the delta phase in GH4169 alloy and its use method. Background technique: [0002] Metallographic examination is an important means to analyze the internal relationship between material microstructure, structure and performance, optimize the process and improve product quality in the process of deformed superalloy research and product development. Metallographic corrosion is an important task in metallographic inspection. Appropriate etchant and its preparation and application methods play an important role in clearly displaying alloy phase and its structure and morphology, eliminating false images and avoiding misjudgment. [0003] GH4169 is a Ni-Cr-Fe-based deformed superalloy which is precipitated and strengthened by the body-centered square γ” phase and the face...

Claims

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Application Information

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IPC IPC(8): G01N1/32G01N21/84C23F1/30
CPCC23F1/30G01N1/32G01N21/84
Inventor 张勇韦康贾崇林王涛李钊
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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