Dual-phase stainless steel crystalline grain structure display method

A technique for duplex stainless steel, display method, application in the direction of material analysis, measuring devices, instruments, etc. using wave/particle radiation

Inactive Publication Date: 2012-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two-phase structure of ferrite and austenite is often observed by the electrolytic staining metallographic method of 10% sodium hydroxide solution, which is only suitable for the calculation of the two-phase ratio

Method used

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  • Dual-phase stainless steel crystalline grain structure display method
  • Dual-phase stainless steel crystalline grain structure display method
  • Dual-phase stainless steel crystalline grain structure display method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0022] Embodiment: adopt experimental technology of the present invention, the organization after solid solution treatment of S32750 super duplex stainless steel has been observed and analyzed, and concrete implementation process and result are as follows:

[0023] The samples after solid solution at different temperatures are processed into a plate-shaped test block with a length of 15mm * 10mm width * 4mm thickness. The surface to be tested is a long and wide surface. First, the surface of the plate is mechanically polished, and the surface roughness is GB / T1031—95 Ra : 0.020—0.050;

[0024] Select perchloric acid as the electrolytic polishing solution of the oxidizing agent, and the composition of the polishing solution is based on 1000 milliliters of ethanol, as shown in the following table:

[0025]

[0026] Then electropolishing was performed on a Struers Lectropol-5 electropolishing instrument, the voltage of the electropolishing was 32V, the polishing time was 12 se...

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PUM

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Abstract

The invention discloses a dual-phase stainless steel crystalline grain structure display method which comprises four working procedures of mechanical polishing, electrolytic polishing, scanning crystal orientation measurement with an electron back-scattering diffraction (EBSD) instrument and crystalline grain structure display. The method comprises the following steps of: processing a test piece; performing mechanical polishing and electrolytic polishing on the test piece; then performing surface scanning crystal orientation measurement on a selected region on the test sample; performing phase discrimination on ferrite phase and austenite phase; and finally performing computer data analysis on crystal orientation data acquired by EBSD, and displaying different orientations with different colors. According to the method, ferrite and austenite dual-phase crystalline grains can be clearly displayed.

Description

technical field [0001] The invention belongs to the field of stainless steel microstructure observation and analysis. Background technique [0002] The so-called duplex stainless steel means that there are both austenite and ferrite in the solid solution structure of stainless steel, and the two phases exist independently, and the content is about half. It is generally believed that the content of the lesser phase should be at least greater than 30%. Duplex stainless steel combines the excellent toughness and weldability of austenitic stainless steel with the high strength and chloride stress corrosion resistance of ferritic stainless steel. Duplex stainless steel has been in practical use for many years, especially the contemporary ultra-low carbon nitrogen-containing duplex stainless steel has overcome some problems in welding, and with the introduction of super duplex stainless steel into the market, the application in some harsh media has been expanded, making The appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/203G01N1/32
Inventor 张寿禄赵泳仙李国平李建春彭忠义
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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