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Corrosion method for clearly displaying metallographic structure of cold-rolled alpha+beta type titanium alloy pipe

A technology for clearly displaying the metallographic structure, which is applied in the corrosion field of clearly displaying the metallographic structure of the cold-rolled α+β-type titanium alloy pipe, which can solve the problems of unfavorable accurate characterization and inconspicuous metallographic structure, and improve the corrosion effect , improve efficiency, broad application value and prospect

Active Publication Date: 2021-04-20
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Under the action of the existing Kroll corrosive solution, the metallographic structure is not obvious, and there is a certain degree of deformation and chromatic aberration in various phases and boundaries (caused by reflection, refraction, diffuse reflection, etc. of light on surfaces with different flatness) , which is not conducive to accurate characterization

Method used

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  • Corrosion method for clearly displaying metallographic structure of cold-rolled alpha+beta type titanium alloy pipe
  • Corrosion method for clearly displaying metallographic structure of cold-rolled alpha+beta type titanium alloy pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Take a polytetrafluoroethylene beaker with a capacity of 300mL, add 100mL of deionized water, measure 1mL of hydrofluoric acid and add it, weigh 2g of ammonium bifluoride powder and add it into the solution, stir until it is completely dissolved, and let it stand for 2 minutes to obtain solution A; add 8mL of concentrated nitric acid and 2mL of concentrated sulfuric acid. During this process, it is necessary to pay attention to the continuous stirring when adding concentrated sulfuric acid to avoid safety accidents. Weigh 3g of oxalic acid powder and add it to the solution, and then add 10mL of methanol to obtain solution B; Place in the ice-water mixture, control the temperature of solution B at 0-4°C, soak the ground and polished metallographic sample in the solution, wipe the surface of the sample to be inspected at a frequency of 3 times / min, and the corrosion time for 2 minutes, then take it out, rinse with water, and blow dry.

Embodiment 2

[0034] Take a polytetrafluoroethylene beaker with a capacity of 300mL, add 100mL of deionized water, measure 0.5mL of hydrofluoric acid into it, weigh 2g of ammonium bifluoride powder into the solution, stir until completely dissolved, and let it stand for 2 minutes to obtain solution A; Add 5mL of concentrated nitric acid and 1mL of concentrated sulfuric acid. During this process, it is necessary to keep stirring when adding concentrated sulfuric acid to avoid safety accidents. Weigh 3g of oxalic acid powder and add it to the solution, and then add 10mL of methanol to obtain solution B; Place B in a mixture of ice and water, control the temperature of solution B at 0-4°C, soak the ground and polished metallographic sample in the solution, wipe the surface of the sample to be inspected at a frequency of 4 times / min, and corrode The time is 3 minutes, then take it out, rinse with clean water, and blow dry.

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Abstract

The invention belongs to the technical field of titanium alloy metallographic structure observation, and particularly relates to a corrosion method for clearly displaying a metallographic structure of a cold-rolled alpha+beta type titanium alloy pipe. The technical problem to be solved by the invention is to provide the corrosion method for clearly displaying the metallographic structure of the cold-rolled alpha+beta type titanium alloy pipe. The method comprises the following steps of: a, adding hydrofluoric acid and water into a beaker, adding ammonium bifluoride, performing stirring until the ammonium bifluoride is completely dissolved, and conducting standing to obtain a solution A; b, adding concentrated nitric acid and concentrated sulfuric acid into the solution A, and sequentially adding oxalic acid and methanol to obtain a solution B; and c, soaking a ground and polished metallographic specimen into the solution B, conducting corroding, taking out the specimen, performing washing with clear water, and conducting blow-drying. By the adoption of the method, the corrosion effect of the metallographic structure of the cold-rolled titanium alloy pipe can be improved, the alpha+beta phase structure of the cold-rolled TC titanium alloy can be displayed more clearly, structure observation and subsequent phase identification are facilitated, and a positive effect is brought to detection work.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy metallographic structure observation, and in particular relates to a corrosion method for clearly displaying the metallographic structure of a cold-rolled α+β type titanium alloy pipe material. Background technique [0002] With the development of science and technology, titanium alloys are used more and more, and the required supply status is also varied. The cold-rolled titanium alloy pipes (only for stress relief annealing) are due to their high dimension accuracy, good surface quality, The mechanical properties are qualified, and there are more demands. For cold deformed metals, the mechanical properties and metallographic structure in the direction of extension are the most basic inspection indicators. [0003] The common cold-rolling process of TC titanium alloys is direct multi-pass cold rolling after the cast or forged bars are hot-rolled and pierced or bored and cut out. , elonga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N1/34
Inventor 杨旭邢远蔡晓文杨小琴
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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