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Etching agent showing solidified dendritic structure of fe‑36ni Invar alloy and its etching method

A technology of Invar alloy and dendrite structure, which is applied in the field of metallographic inspection and analysis, can solve the problems of poor display effect, achieve the effects of moderate erosion time, optimized solidification conditions of cast slab, and simple operation procedures

Active Publication Date: 2018-01-09
山西高义钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using the above five dendrite corrosive agents and corresponding methods to etch the Fe-36Ni Invar dendrite structure, either the primary or secondary dendrite structure cannot be eroded, or the display effect is very poor.
From the query in the patent literature, there is no corrosion method specially suitable for the dendrite structure of the Fe-36Ni Invar alloy cast slab

Method used

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  • Etching agent showing solidified dendritic structure of fe‑36ni Invar alloy and its etching method
  • Etching agent showing solidified dendritic structure of fe‑36ni Invar alloy and its etching method
  • Etching agent showing solidified dendritic structure of fe‑36ni Invar alloy and its etching method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take the sample at the solid-liquid interface in the directional solidification structure of Fe-36Ni Invar alloy, grind the sample on 150#, 400#, 600#, 1000#, 1500#, 2000# water sandpaper in turn, and then grind it on the polishing machine Polish with 2.5 μm diamond paste until the surface of the sample is as smooth as a mirror. Rinse the surface with alcohol after polishing, and then dry it with a polisher to prepare for corrosion. Add 1.5g of analytically pure picric acid into a beaker filled with 55ml of absolute ethanol, then add 0.5g of anhydrous copper chloride and 1.5g of sodium dodecylbenzenesulfonate in turn, and finally add 1ml of hydrochloric acid dropwise. Heat the prepared etching solution to 60°C on a water bath heating pan, then clamp the processed sample with tweezers so that the polished side faces down, and suspend it in the etching solution in a beaker for 25 seconds. After the erosion is over, wipe the eroded surface with a cotton ball dipped in alc...

Embodiment 2

[0027] Take the sample of Fe-36Ni Invar alloy billet columnar crystal, grind the sample on 150#, 400#, 600#, 1000#, 1500#, 2000# water sandpaper in turn, and then use 2.5μm diamond on the polishing machine Polish with abrasive paste until the surface of the specimen is as smooth as a mirror. Rinse the surface with alcohol after polishing, and then dry it with a polisher to prepare for corrosion. Add 1.5g of analytically pure picric acid into a beaker filled with 55ml of absolute ethanol, then add 0.5g of anhydrous copper chloride and 1.5g of sodium dodecylbenzenesulfonate in turn, and finally add 1ml of hydrochloric acid dropwise. Heat the prepared etching solution to 60°C on a water bath heating pan, then clamp the processed sample with tweezers so that the polished side faces down, and suspend it in the etching solution in a beaker for 25 seconds. After the erosion is over, wipe the eroded surface with a cotton ball dipped in alcohol, then polish it at a radius of 1 / 4 of th...

Embodiment 3

[0029] Take samples from the equiaxed grains of the Fe-36Ni Invar alloy billet, grind the samples on 150#, 400#, 600#, 1000#, 1500#, 2000# water sandpaper in turn, and then use a 2.5μm Polish with diamond paste until the surface of the specimen is as smooth as a mirror. Rinse the surface with alcohol after polishing, and then dry it with a polisher to prepare for erosion. Add 1.5g of analytically pure picric acid into a beaker filled with 55ml of absolute ethanol, then add 0.5g of anhydrous copper chloride and 1.5g of sodium dodecylbenzenesulfonate in turn, and finally add 1ml of hydrochloric acid dropwise. Heat the prepared etching solution to 60°C on a water bath heating pan, then clamp the processed sample with tweezers so that the polished side faces down, and suspend it in the etching solution in a beaker for 25 seconds. After the erosion is over, wipe the eroded surface with a cotton ball dipped in alcohol, then polish it at a radius of 1 / 4 of the polishing machine for ...

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Abstract

Disclosed are an erosion agent capable of displaying the solidified dendritic structure of a Fe-36 Ni invar alloy and an erosion method of the erosion agent. The erosion agent includes 1 g-2 g of picric acid, 0.5 g-1 g of anhydrous cupric chloride, 50 ml-60 ml of absolute ethyl alcohol, 0.5 ml-1 ml of hydrochloric acid and 1 g-2 g of sodium dodecylbenzene sulfonate. The erosion method of the erosion agent includes the steps that the prepared erosion agent is heated to the temperature of 50 DEG C-60 DEG C, a processed sample with the downward polishing face is suspended in the heated erosion agent to be eroded for 20 s-30 s, the eroded surface is wiped with ethyl alcohol firstly after erosion is completed, and then the sample is slightly polished at the one fourth radius position of a polishing machine for 4 s-6 s so that a copper film generated on the eroded surface can be removed. According to the method, the operating procedure is simple, the erosion effect is good, and the solidified dendritic structure of an invar alloy can be observed quickly and clearly, so that the solidification condition corresponding to continuous casting is obtained, and technical bases are provided for optimizing the continuous casting process technologies.

Description

technical field [0001] The invention belongs to the technical field of metallographic inspection and analysis, and in particular relates to an etchant for displaying solidified dendrite structure of Fe-36Ni Invar alloy and a display method thereof. Background technique [0002] Due to the low ductile-brittle transition temperature, Fe-36Ni Invar alloy is very sensitive to hot cracks, and hot cracks are easily generated inside the slab during continuous casting. Hot crack is a kind of defect that occurs during the solidification process of the alloy, which will lead to internal cracks in the slab during solidification, and in severe cases, it will cause the slab to crack during rolling. The cooling rate of the continuous casting process has a great influence on the thermal cracks. Controlling the appropriate continuous casting process parameters, that is, the continuous casting cooling rate, has a significant effect on reducing the thermal cracks of the slab. According to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/32C23F1/28
CPCC23F1/28G01N1/32
Inventor 于彦冲张金玲王社斌
Owner 山西高义钢铁有限公司
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