Metallographic display method of nickel-saving austenitic stainless steel

A technology for displaying austenitic stainless steel, applied in the preparation of test samples, etc., can solve the problems of poor corrosion effect and unclear grain boundary, and achieve good corrosion effect, easy to learn corrosion operation, and clear grain boundary Effect

Active Publication Date: 2022-02-01
LIUZHOU IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a metallographic display method of nickel-saving austenitic stainless steel, which has good structure display effect, is suitable for the metallographic corrosion agent of nickel-saving austenitic stainless steel and its preparation and corrosion method, and is convenient, safe and stable in operation. It has good reproducibility, can quickly, uniformly and clearly display the metallographic structure, can solve the problems of poor corrosion effect and unclear grain boundary in the existing technology, and is beneficial to structure analysis and grain size evaluation

Method used

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  • Metallographic display method of nickel-saving austenitic stainless steel
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  • Metallographic display method of nickel-saving austenitic stainless steel

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preparation example Construction

[0066] (1) Preparation of etchant

[0067] The corrosive agent is prepared from 8-12 parts by weight of oxalic acid, 2-4 parts by volume of hydrochloric acid, and 80-120 parts by volume of distilled water, wherein, when the unit of the parts by weight is gram, the unit of the parts by volume is milliliters ; When the unit of the parts by weight is kilogram, the unit of the parts by volume is liter; the consumption of each component can be enlarged or reduced in equal proportion.

[0068] a) Add 8-12 g of oxalic acid into 80-120 ml of distilled water, and keep stirring to mix evenly.

[0069] b) Pour 2-4ml hydrochloric acid into the prepared oxalic acid solution, stir and mix evenly.

[0070] (2) Metallographic corrosion method

[0071] a) The nickel-free austenitic stainless steel sample is made into a metallographic sample by rough grinding, fine grinding, polishing, cleaning and drying.

[0072] b) Take the prepared sample as the anode, fix it with galvanized tweezers and...

Embodiment 1

[0081] (1) Preparation of corrosive agent

[0082] First add 10g of oxalic acid into a beaker filled with 100ml of distilled water, stir evenly, then add 2ml of hydrochloric acid into the prepared oxalic acid solution, stir evenly to prepare a corrosion solution.

[0083] (2) Sample preparation

[0084] Grind and polish the test surface of the J3-section nickel-type austenitic stainless steel cold-rolled sample with 240#, 360#, 600#, 800#, 1000#, and 1200# water-grinding paper in turn after bright annealing to form a sample to be corroded, and then Rinse with distilled water, spray with alcohol and blow dry.

[0085] (3) Corrosion display

[0086] Fix the sample with tweezers and connect it to a DC power supply. The sample is connected to the positive pole, the aluminum plate is connected to the negative pole, the voltage is 20V, and the time is 50s. After the corrosion is over, cut off the power supply, remove the sample, rinse it with distilled water, then spray it with al...

Embodiment 2

[0088] (1) Preparation of corrosive agent

[0089] First add 8g of oxalic acid into a beaker filled with 90ml of distilled water, stir evenly, then add 3ml of hydrochloric acid into the prepared oxalic acid solution, stir evenly to prepare a corrosion solution.

[0090] (2) Sample preparation

[0091] The test surface of the J3 section nickel-type austenitic stainless steel hot-rolled sample that has undergone solution treatment is ground and polished with 240#, 360#, 600#, 800#, 1000#, and 1200# water-grinding sandpaper in turn to form a sample to be corroded. Then rinse with distilled water, spray with alcohol and blow dry.

[0092] (3) Corrosion display

[0093] Fix the sample with tweezers and connect it to a DC power supply. The sample is connected to the positive pole, the aluminum plate is connected to the negative pole, the voltage is 25V, and the time is 45s. After the corrosion is over, cut off the power supply, remove the sample, rinse it with distilled water, t...

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Abstract

The embodiment of the present invention provides a method for metallographic display of nickel-saving austenitic stainless steel. The nickel-saving austenitic stainless steel sample is made into a metallographic sample by rough grinding, fine grinding, polishing, cleaning and drying; The prepared metallographic sample is the anode, which is fixed with galvanized tweezers and connected to the positive pole of the DC power supply; the aluminum plate is used as the cathode, and the metallographic sample is connected to the negative pole of the DC power supply. The aluminum plates are kept parallel, the polished surface of the metallographic sample faces the aluminum plate, the etchant is used as the conductive solution, the anode and the cathode are immersed in the etchant, and the wires immersed in the etchant are made of metal materials; the power is turned on and the voltage is controlled at 20-30V. The time is controlled at 40-60s, and the corrosion surface of the metallographic sample is silver gray, and the corrosion is over; cut off the power, remove the metallographic sample, rinse it with distilled water, then spray it with alcohol and dry it, and finally use a metallographic microscope Observation of the obtained nickel-saving austenitic stainless steel structure.

Description

technical field [0001] The invention belongs to the technical field of metallographic display, and in particular relates to a metallographic display method of nickel-saving austenitic stainless steel. Background technique [0002] Nickel-saving austenitic stainless steel is a metastable austenitic stainless steel obtained by substituting manganese and nitrogen for nickel in chromium-nickel stainless steel. This series of steel has good strength, plasticity and considerable corrosion resistance, and its corrosion resistance can be compared with stainless steel 304 in general use environments; therefore, it is widely used, mainly used in civil fields such as kitchen, bathroom equipment and appliances and Building decoration and other industries. In the research and application of nickel-saving austenitic stainless steel, in order to ensure a stable austenite structure, it is necessary to analyze its structure, and adjust its composition, rolling and solution treatment process...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/06C22C38/02C22C38/42C22C38/58G01N1/32
CPCC25F3/06C22C38/02C22C38/58C22C38/42C22C38/002C22C38/001G01N1/32
Inventor 吴海林蒙曰睿廖耀俊庞锐曾垚陈盛淋
Owner LIUZHOU IRON & STEEL
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