Metallographic corrosion method for high-carbon martensitic stainless steel grain boundary

A carbon martensitic and metallographic corrosion technology, applied in the field of stainless steel metallographic analysis and detection, can solve the problems of complicated operation, no high-carbon martensitic stainless steel grain boundary metallographic corrosion method, high cost, short corrosion time, high cost and high cost. Effective grain boundary corrosion method, good effect

Pending Publication Date: 2020-10-23
什邡新工金属材料有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] It can be seen that the existing research can only corrode medium and low carbon martensitic stainless steel, or use oxidation method or multiple corrosion + polishing special process, which is complex in operation and high in cost, and there is no special treatment for high carbon martensitic stainless steel. The metallographic corrosion method in the world needs to be developed urgently

Method used

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  • Metallographic corrosion method for high-carbon martensitic stainless steel grain boundary
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  • Metallographic corrosion method for high-carbon martensitic stainless steel grain boundary

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Embodiment 1

[0044] Embodiment 1 adopts the inventive method to corrode 9Cr18Mo high-carbon martensitic stainless steel

[0045] (1) Sample treatment: 9Cr18Mo high-carbon martensitic stainless steel metallography is coarsely ground with water sandpaper (400 mesh), finely ground with 600 / 800 / 1000 mesh metallographic sandpaper, polished with diamond abrasive paste, and cleaned with ultrasonic cleaning agent + alcohol After rinsing, dry with a hair dryer to obtain a bright polished surface without scratches.

[0046] (2) Use a 200ml beaker to weigh 4g of picric acid on an electronic balance, use a measuring cylinder to take 100ml of analytically pure grade alcohol and pour it into the beaker, and then remove the measuring cylinder to take 5ml of concentrated hydrochloric acid with a mass fraction of 30% and drop it into the beaker. After the rod is stirred, add 5ml of detergent to the solution after the dissolution, and continue to stir evenly. Pour the prepared reagent into the volumetric fl...

Embodiment 2

[0050] Embodiment 2 adopts the inventive method to corrode 6Cr18Mo high-carbon martensitic stainless steel

[0051] (1) Sample treatment: 6Cr18Mo high-carbon martensitic stainless steel metallography is rough ground with water sandpaper (400 mesh), finely ground with 600 / 800 / 1000 mesh metallographic sandpaper, polished with diamond abrasive paste, cleaned with ultrasonic cleaning agent + alcohol After rinsing, dry with a hair dryer to obtain a bright polished surface without scratches.

[0052] (2) Use a 200ml beaker to weigh 1g of picric acid on an electronic balance, use a measuring cylinder to take 100ml of analytically pure grade alcohol and pour it into the beaker, and then remove the measuring cylinder to take 5ml of concentrated hydrochloric acid with a mass fraction of 30% and drop it into the beaker. After the rod is stirred, add 2ml of detergent to the solution after the dissolution, and continue to stir evenly. Pour the prepared reagent into the volumetric flask and...

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Abstract

The invention belongs to the field of metallographic analysis and detection of stainless steel, and particularly relates to a metallographic corrosion method for high-carbon martensitic stainless steel grain boundary. The problem that a metallographic corrosion method which aims at high-carbon martensitic stainless steel, is easy and convenient to operate and low in cost is lacked is solved. The invention provides the metallographic corrosion method of a high-carbon martensitic stainless steel grain boundary, wherein the method comprises the following steps: carrying out coarse grinding, finegrinding, polishing, cleaning and drying on a high-carbon martensitic stainless steel metallographic sample to obtain a bright scratch-free polished surface; and corroding the polished surface for 5-30 s at room temperature by adopting a metallographic corrosive agent, cleaning and drying. The metallographic corrosive agent is composed of 1 g to 4 g of picric acid, 5 ml of concentrated hydrochloric acid, 100 ml of ethyl alcohol and 2 ml to 5 ml of dishwashing liquid. The method aims at the high-carbon martensitic stainless steel, the grain boundary display effect is good, normal-temperature corrosion is adopted without pre-heating the sample, the corrosion time is short, operation is easy, and application and popularization are easy.

Description

technical field [0001] The invention belongs to the field of metallographic analysis and detection of stainless steel, in particular to a method for metallographic corrosion of grain boundaries of high-carbon martensitic stainless steel. Background technique [0002] High-carbon martensitic stainless steel belongs to hypereutectoid steel. It is a kind of stainless steel that improves the wear resistance of the material mainly by increasing the carbon content of the steel. This type of stainless steel is widely used due to its strong corrosion resistance and wear resistance. Used in bearing rings, bearing rolling elements, precision shafts, measuring tools, surgical instruments and other fields. The matrix of this type of stainless steel material contains high carbon content. The metallographic structure after quenching is generally martensite matrix + eutectic carbide + retained austenite + secondary carbide + metal compound. Due to the high carbon content, After quenching,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32G01N33/204
CPCG01N1/32G01N33/204
Inventor 庞源周诚岩王新程向花红
Owner 什邡新工金属材料有限公司
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