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Grain boundary corrosion method of high niobium beta titanium alloy

A β-titanium alloy and grain boundary corrosion technology is applied in the field of grain boundary corrosion of high niobium β titanium alloy, which can solve the problems of high niobium β titanium alloy and high niobium β titanium alloy being difficult to polish, and achieves high preparation efficiency and operation. Simple, easy-to-control effects

Inactive Publication Date: 2014-01-15
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a polishing cloth covered with silk cloth, a mixture of alumina powder, chromium oxide powder and water as a polishing agent to mechanically polish the metallographic sample. The surface of the polished metallographic sample is bright without scratches, which solves the problem of high The problem that niobium β-titanium alloy is not easy to polish; use hydrofluoric acid, nitric acid, hydrochloric acid and water to mix and prepare the etchant in an appropriate proportion to soak and corrode the polished metallographic sample, which can quickly, easily and effectively obtain high niobium β-titanium The clear and complete grain boundary structure of the alloy solves the problem that there is no suitable corrosion method for high-niobium β-titanium alloys

Method used

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  • Grain boundary corrosion method of high niobium beta titanium alloy
  • Grain boundary corrosion method of high niobium beta titanium alloy
  • Grain boundary corrosion method of high niobium beta titanium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Step 1, cutting a metallographic sample from the parts after the solid solution treatment whose alloy composition is Ti-25Nb-25Zr, then coarsely grinding the metallographic sample, and then finely grinding;

[0027] Step 2: Cover the polishing cloth with a layer of silk cloth on the side of the polishing cloth, and use the polishing cloth covered with silk cloth to mechanically polish the metallographic sample after fine grinding in step 1 until the surface of the metallographic sample is bright and free of scratches ; The polishing agent for mechanical polishing is a mixture of alumina powder, chromium oxide powder and water mixed uniformly according to the mass ratio of 1:1:100;

[0028] Step 3. Mix concentrated hydrofluoric acid (40wt%), concentrated nitric acid (65wt%~68wt%), concentrated hydrochloric acid (36wt%~38wt%) and water in a volume ratio of 1:2:3:5 to obtain a corrosive agent ;

[0029] Step 4, placing the mechanically polished metallographic sample in st...

Embodiment 2

[0033] Step 1, cutting a metallographic sample from the parts after the solid solution treatment whose alloy composition is Ti-35Nb-7Zr-5Ta, and then coarsely grinding the metallographic sample, and then finely grinding;

[0034] Step 2: Cover the polishing cloth with a layer of silk cloth on the side of the polishing cloth, and use the polishing cloth covered with silk cloth to mechanically polish the metallographic sample after fine grinding in step 1 until the surface of the metallographic sample is bright and free of scratches ; The polishing agent for mechanical polishing is a mixture of alumina powder, chromium oxide powder and water mixed uniformly according to the mass ratio of 2:1:100;

[0035] Step 3. Mix concentrated hydrofluoric acid (40wt%), concentrated nitric acid (65wt%~68wt%), concentrated hydrochloric acid (36wt%~38wt%) and water in a volume ratio of 1:4:3:7 to obtain a corrosive agent ;

[0036] Step 4, placing the mechanically polished metallographic sampl...

Embodiment 3

[0040] Step 1, cutting a metallographic sample from the parts after solid solution treatment whose alloy composition is Ti-47Nb, and then coarsely grinding the metallographic sample, and then finely grinding;

[0041] Step 2: Cover the polishing cloth with a layer of silk cloth on the side of the polishing cloth, and use the polishing cloth covered with silk cloth to mechanically polish the metallographic sample after fine grinding in step 1 until the surface of the metallographic sample is bright and free of scratches The polishing agent for mechanical polishing is a mixture of alumina powder, chromium oxide powder and water mixed uniformly according to the mass ratio of 2:1.5:100;

[0042] Step 3. Mix concentrated hydrofluoric acid (40wt%), concentrated nitric acid (65wt%~68wt%), concentrated hydrochloric acid (36wt%~38wt%) and water according to the volume ratio of 2:4:4:7 to obtain the corrosive agent ;

[0043] Step 4, placing the mechanically polished metallographic sam...

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Abstract

The invention discloses a grain boundary corrosion method of a high niobium beta titanium alloy. The grain boundary corrosion method comprises the steps of cutting a metallographic specimen from the high niobium beta titanium alloy, firstly coarse grinding the metallographic specimen, and then fine grinding. The method further comprises the following steps: 1. covering a layer of real silk cloth on a side of a piece of polishing cloth for polishing, adopting the polishing cloth covered with the real silk cloth to carry out mechanical polishing to the fine ground metallographic specimen until the surface of the metallographic specimen is bright and free from scratch; 2. preparing a corrosive agent; 3. placing the mechanically polished metallographic specimen in the corrosive to soak and corrode until the corroded side of the metallographic specimen becomes silver gray; 4. taking out the soaked and corroded metallographic specimen, using water to wash away the residual corrosive agent, and then using ethyl alcohol to rinse the metallographic specimen and drying. The method is simple to operate, easy to control conditions and high in specimen preparing efficiency, can quickly, easily and effectively obtain the clear and complete crystal boundary structure, and solves the problems that the high niobium beta titanium alloy is not easy to polish and does not have a proper corrosion method.

Description

technical field [0001] The invention belongs to the technical field of metallographic corrosion of titanium alloys, and in particular relates to a method for grain boundary corrosion of high-niobium beta titanium alloys. Background technique [0002] Among the existing various titanium alloys, the metallographic samples of β-titanium alloys with higher Nb content are not easy to polish, shallow scratches are not easy to be removed during polishing, and corrosion pits are easily formed during chemical polishing. Usually, the metallographic etchant of titanium alloy is mainly composed of water, nitric acid, hydrofluoric acid and other components. When the above metallographic etchant is used to corrode the high-niobium titanium alloy after solution treatment, the grain boundary cannot be clearly displayed, and only part of the grain boundary can be displayed. . These problems prevent us from obtaining the ideal phase structure of high niobium β-titanium alloy. [0003] In re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
Inventor 周伟葛鹏李倩辛社伟郑莉
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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