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High-alloy low-carbon martensitic steel primary grain display agent and display method

A martensitic steel and display agent technology, which is applied in particle size analysis, particle and sedimentation analysis, measuring devices, etc. Simple, novel idea, complete effect of grain boundary display

Active Publication Date: 2015-11-18
安徽华驰动能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion of the original austenite grain boundary is difficult to be corroded by the usual picric acid solution, and there are few literatures on this aspect.
Patent [201110009408.1] provides a grain size corrosion method for medium and high carbon steel, but it is not suitable for high alloy low carbon martensitic steel

Method used

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  • High-alloy low-carbon martensitic steel primary grain display agent and display method
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  • High-alloy low-carbon martensitic steel primary grain display agent and display method

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Experimental program
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Effect test

preparation example Construction

[0013] I. Sample preparation:

[0014] a. Sampling

[0015] The sample is taken directly from the steel in the delivery state, and the structural change caused by the temperature rise must be prevented when sampling. The principle of sample size selection is to facilitate the operation of grinding, polishing and tissue observation. For example, cylindrical samples of φ10×15mm or φ15×18mm can also be used for 10×10×15mm or 12×15×18mm. Cuboid sample.

[0016] b. Grinding sample

[0017] Use metallographic sandpaper or water sandpaper of different meshes to grind the surface of the sample for multiple passes. The meshes of the sandpaper are in order from small to large, and the mesh of the last grinding sample is generally 1000 or 1200.

[0018] c. Polishing

[0019] Mechanical polishing, using polishing agent and woolen cloth to polish on the polishing machine, using water to lubricate and wet the woolen cloth during polishing, and polish until the surface of the sample is s...

Embodiment 1

[0033] At room temperature of 25°C, first measure 5ml concentrated nitric acid (concentration 65mass%), pour into 50ml (purity 95mass%) industrial alcohol and shake well, add 15ml concentrated hydrochloric acid (36mass%), shake well, pour into airtight glassware placed in. Before the sample is corroded, take out the prepared above-mentioned solution, add 1 gram of picric acid, stir and shake well, then add 1.5 grams of sodium dodecylbenzene sulfonate, stir and shake well. Pour an appropriate amount of the prepared etchant solution into the evaporating dish, place a thin layer of absorbent cotton (immersed in the solution) in the evaporating dish, and place the 1Cr12Ni1Mo steel surface of the sample to be corroded on the absorbent cotton to avoid contact between the sample and the glassware wall. , the erosion time was controlled at 8 minutes, and then the sample was taken out to wipe the surface with alcohol, dried with hot air, and then microstructure observation and electron...

Embodiment 2

[0034] Embodiment 2 is implemented with the method of Embodiment 1, and its composition ratio and corrosion conditions are listed in Table 1.

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Abstract

The invention relates to an original crystalline grain displaying agent of high-alloy and low-carbon martensite steel and a displaying method. The displaying agent is formed by the following components according to solvent volume (ml) and mass (g): 5-10 ml of concentrated nitric acid, 10-30 ml of concentrated hydrochloric acid, 50-100 ml of alcohol, 0.5-4 g of picric acid and 1.0-6.0 g of sodium dodecyl benzene sulfonate. The displaying method is carried out by the steps of preparing a test sample, configuring the displaying agent, corroding the test sample, organizing and observing, and collecting an image. The original crystalline grain displaying agent of high-alloy and low-carbon martensite steel and the displaying method have the advantages of novel concept, simplicity in operation, complete crystal boundary display effect, capability of clearly recognizing a grain size, and convenience for accurately measuring the original grain size and grain fineness number, and provide good conditions for formulating and optimizing a steel product production process.

Description

technical field [0001] The invention belongs to the technical field of reagents for metallographic structure inspection of iron and steel materials, and in particular relates to a reagent and method for microstructure detection of high-alloy low-carbon steel martensitic steel. Background technique [0002] High-alloy low-carbon martensitic steel is widely used in industry, especially large-scale castings and forgings in the heavy machinery industry, such as rotors of steam turbines, runners and blades of water turbines, etc. The original grain of martensitic steel is one of the important indicators to evaluate and test the performance of martensitic steel. For high-alloy martensitic steel, it contains a large amount of alloying elements, such as chromium, nickel, manganese, etc., which make it relatively corrosion-resistant. Generally, strong acid solutions are commonly used for the corrosion of its structure. However, it is difficult to corrode the grain boundaries of prio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G01N1/32G01N1/28
Inventor 吕知清傅万堂吕栋王博王振华厉勇赵德利
Owner 安徽华驰动能科技有限公司
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