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Electrolytic etching method for displaying two-phase structure and grain boundary of duplex stainless steel

A duplex stainless steel, grain boundary technology, applied in the field of metallographic erosion, can solve the problem that the two-phase grain boundary of duplex stainless steel cannot be displayed, and achieve the effect of accurate and reliable data parameters

Pending Publication Date: 2022-07-29
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current etching method usually obtains the metallographic distribution of one or more phases in the alloy, and can only observe the phase boundary between ferrite and austenite with simple structure distribution, especially the duplex stainless steel. Two-phase grain boundary, observation of grain size and shape

Method used

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  • Electrolytic etching method for displaying two-phase structure and grain boundary of duplex stainless steel
  • Electrolytic etching method for displaying two-phase structure and grain boundary of duplex stainless steel
  • Electrolytic etching method for displaying two-phase structure and grain boundary of duplex stainless steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The selected material is 20Cr3Mn1Ni resource-saving duplex stainless steel hot-rolled sheet, and its composition by mass percentage is: C: 0.02%, Cr: 20%, Mn: 3%, Ni: 1%, Si: 0.35, N: 0.2% , the remainder is Fe; the metallographic microscope model is Leica DM13000H.

[0039] The specific operation steps of this embodiment are as follows:

[0040] Step 1: Prepare metallographic samples.

[0041] (1) Use a molybdenum wire cutter to cut metallographic samples from the hot-rolled sheet;

[0042] (2) Use 80#, 180#, 240#, 400#, 800#, 1000# sandpaper from coarse to fine to grind the observation surface of the metallographic sample;

[0043](3) Use a metallographic polishing machine equipped with a velvet polishing cloth to mechanically polish the observation surface of the metallographic sample until the polished surface is bright and free of scratches. The polishing agent used for mechanical polishing is 1.5 μm diamond spray polishing agent.

[0044] The second step: formu...

Embodiment 2

[0058] The selected material is 20Cr3Mn1Ni resource-saving duplex stainless steel plate after solution treatment, and its components are: C: 0.02%, Cr: 20%, Mn: 3%, Ni: 1%, Si: 0.35, N: 0.2%, the balance is Fe; the metallographic microscope model is Leica DM13000H.

[0059] The specific operation steps of this embodiment are as follows:

[0060] Step 1: Prepare metallographic samples.

[0061] (1) Use a molybdenum wire cutting machine to cut metallographic samples from the plate;

[0062] (2) Use 80#, 180#, 240#, 400#, 800#, 1000# sandpaper from coarse to fine to grind the observation surface of the metallographic sample;

[0063] (3) Use a metallographic polishing machine equipped with a velvet polishing cloth to mechanically polish the observation surface of the metallographic sample until the polished surface is bright and free of scratches. The polishing agent used in mechanical polishing is 1.5 μm diamond spray polishing agent.

[0064] Step 2: Configure Electrolytic ...

Embodiment 3

[0078] The selected material is 20Cr3Mn1Ni2Cu resource-saving duplex stainless steel plate after solution treatment, and its composition by mass percentage is: C: 0.02%, Cr: 20%, Mn: 3%, Ni: 1%, Cu: 2%, Si : 0.35, N: 0.2%, the balance is Fe; the metallographic microscope model is Leica DM13000H.

[0079] The specific operation steps of this embodiment are as follows:

[0080] Step 1: Prepare metallographic samples.

[0081] (1) Use a molybdenum wire cutting machine to cut metallographic samples from the plate;

[0082] (2) Use 80#, 180#, 240#, 400#, 800#, 1000# sandpaper from coarse to fine to grind the observation surface of the metallographic sample;

[0083] (3) Use a metallographic polishing machine equipped with a velvet polishing cloth to mechanically polish the observation surface of the metallographic sample until the polished surface is bright and free of scratches. The polishing agent used in mechanical polishing is 1.5 μm diamond spray polishing agent.

[0084] ...

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Abstract

The invention discloses an electrolytic etching method for displaying a two-phase structure and a grain boundary of duplex stainless steel. The electrolytic etching method comprises the following steps: S1, preparing an electrolytic etching agent I and an electrolytic etching agent II; s2, the duplex stainless steel sample is soaked in an electrolytic etching agent I for electrolytic etching; s3, taking out the duplex stainless steel sample treated in the step S2 from the electrolytic etching agent I, cleaning, drying, soaking in an electrolytic etching agent II, and carrying out electrolytic etching; s4, taking out the duplex stainless steel sample treated in the step S3 from the electrolytic etching agent II, cleaning and drying to obtain an etched duplex stainless steel sample; wherein the electrolytic etching agent I is a potassium hydroxide aqueous solution with the concentration of 10%-30%; the electrolytic etching agent II is concentrated nitric acid with the volume concentration of 60-70%. According to the electrolytic etching method, the grain boundary can be quickly and effectively shown, and relevant information such as the shape and the size of ferrite-austenite two-phase grains in the alloy can be obtained.

Description

technical field [0001] The invention relates to the technical field of metallographic etching methods, in particular to an electrolytic etching method for displaying two-phase structure and grain boundaries of duplex stainless steel. Background technique [0002] For resource-saving duplex stainless steels, the strategy adopted is to partially replace the Ni and Mo contents with low-cost austenitizing elements N and Mn. Although resource-efficient duplex stainless steels are cost-effective due to their low concentrations of Ni and Mo, their strength and ductility are superior to those of ferritic SUS 430, austenitic SUS 304 and other high Ni content duplex stainless steels At the same time, the quality requirements are greatly reduced and good corrosion resistance is guaranteed. Especially in the contemporary society, the cost and resources are further strictly controlled, which makes the economical duplex stainless steel gradually emerge. At the same time, due to the TRIP...

Claims

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Application Information

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IPC IPC(8): C25F3/06G01N1/32C22C38/58C22C38/42C22C38/44
CPCC25F3/06G01N1/32C22C38/001C22C38/58C22C38/42C22C38/44
Inventor 韩英刘政泓邹豪豪武春博祖国庆朱巍巍冉旭
Owner CHANGCHUN UNIV OF TECH
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