Method for displaying high-strength vessel slab original austenite crystal grain

A technology for austenite grains and ship plate steel, which is applied in the field of metallographic sample preparation, can solve the problems of difficult display of austenite grains of high-strength ship plates, and achieves simple and convenient implementation, clear display, and inhibition of matrix structure. and grain boundaries show good results

Active Publication Date: 2009-02-18
NANTONG WANBAO IND
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for clearly displaying austenite grains of high-st

Method used

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  • Method for displaying high-strength vessel slab original austenite crystal grain
  • Method for displaying high-strength vessel slab original austenite crystal grain

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Embodiment 1

[0025] The technological process and steps of the present embodiment are as follows:

[0026] a Heat treatment: heat the sample at 1000°C, keep it warm for 30 minutes, and perform water quenching.

[0027] b Coarse grinding: Grind the sample after quenching on the grinding wheel to remove the surface oxide layer. Grind the polished sample on 0#, 01# coarse sandpaper. Rotate the sample 90° for grinding, and rotate the sample 90° in the same direction when changing the sandpaper, and observe the surface of the sample frequently to ensure that there are no large scratches perpendicular to the grinding direction on the surface.

[0028] c Fine Grinding-Polishing: Grind the coarsely ground sample on fine sandpaper, from 1# sandpaper to 4# sandpaper, the grinding method is the same as that of rough grinding, and make sure that the surface scratches are in the same direction; Wash the sample, and polish it on a polishing cloth. The polishing agent is 1.5 μm diamond polishing paste, ...

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Abstract

The invention relates to a display method used for preparing high-intensity ship plate metallographic samples and the original austenite grains, belonging to the technical field of metallographic sample preparation. The invention has the following technological steps: coarse grinding, fine grinding, polishing and corrosion; the polished specimen is put in the etching solution at 70-80 DEG C; the formula of the etching solution comprises 100ml of distilled water, 5-7g of picric acid, 0.5-1.5ml of hydrochloric acid, 3-5g of SDBS, 5-15g of Seagull paste shampoo and 0.3-1ml of hydrogen peroxide; after being etched for 1-2 minutes, the surface of the specimen is dimmed, and the specimen is taken out, cleaned with alcohol and then dried; and the relatively clear original austenite structure can be observed under a microscope. The invention has the advantages of solving the problem of different display of the high-intensity ship plate austenite grains and clearly displaying the austenite structure; besides, the invention is easy and simple to implement.

Description

technical field [0001] The invention relates to a method for displaying original austenite grains of high-strength ship plate steel, belonging to the technical field of metallographic sample preparation. Background technique [0002] The size of the original austenite grains of steel will directly affect the change of the microstructure during the controlled rolling and cooling process, thus having a great influence on the mechanical properties of the material, so it is very important to accurately display the original austenite grains of steel significance. There are many ways to display austenite. After repeated experiments, Lan Yingbin and others determined that the reagent formula is: 50 ml of distilled water, 2-3 grams of picric acid, and 1-2 grams of sea-gull shampoo to show the original state of steel. Austenitic structure (Lan Yingbin, Dou Lianfu, Liu Jianhua Steel's physical test showing the grain boundaries of prior austenite). Dong Yuhua introduced an etchant fo...

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Application Information

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IPC IPC(8): G01N1/32G01N13/10C23F1/28G01N1/28
Inventor 张恒华彭晟朱松鹤戴兵邵光杰许珞萍
Owner NANTONG WANBAO IND
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