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Method for rapidly determining phase content of double-phase stainless steel by using metallographic dyeing and software

A dual-phase stainless steel, rapid determination technology, applied in the direction of measuring devices, preparation of test samples, material analysis through optical means, etc., can solve problems such as poor tissue contrast, increase tissue contrast, and difficult quantitative analysis, and achieve accuracy High, easily identifiable, well-defined effects

Inactive Publication Date: 2016-04-20
SHANDONG TAISHAN STEEL GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to provide a method for the disadvantages of poor tissue contrast and difficult quantitative analysis after being corroded by traditional etchant. By using the color metallographic erosion technology of preparing special etchant, the ferrite in duplex stainless steel after dyeing is yellow or yellow. Reddish-brown, austenite is white, thereby increasing the contrast of the structure, using metallographic staining and software to quickly determine the phase content of duplex stainless steel

Method used

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  • Method for rapidly determining phase content of double-phase stainless steel by using metallographic dyeing and software
  • Method for rapidly determining phase content of double-phase stainless steel by using metallographic dyeing and software
  • Method for rapidly determining phase content of double-phase stainless steel by using metallographic dyeing and software

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Embodiment

[0026] figure 2 A picture of the metallographic structure under a metallographic microscope after etching of the present invention is given; image 3 Given an inventive pair figure 2 The ferrite phase content color recognition map in the quantitative analysis shows that the ferrite phase area percentage is 67%.

[0027] The method for quickly measuring the phase content of duplex stainless steel by using metallographic dyeing and software includes in turn: rough grinding, fine grinding, polishing, etching, and observation under a metallographic microscope; the rough grinding is: the sample is passed through 280 # →400 # →600 # Alumina water sandpaper is polished, and water is used as lubricant, and the speed of the grinding disc is 150 rpm; the fine grinding is as follows: the sample that has been roughly ground is rinsed, and the glass plate is subjected to 600 °C. # →800 #For fine grinding with silicon carbide sandpaper, the sample should be rotated 90 degrees in the ...

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Abstract

The invention discloses a method for rapidly determining phase content of a double-phase stainless steel by using metallographic dyeing and software. The method comprises the following steps: rough grinding, fine grinding, polishing, etching, and observation under a metallographic microscope. The method is characterized in that an etching agent comprises 10-30g of potassium ferricyanide, 10-30g of sodium hydroxide and 40-100 ml of water in proportion; etching temperature of a sample is controlled at 40-90 DEG C, an etching step is carried out for 2-10 minutes, the sample can be taken out when the sample presents orange color; structure observation can be carried out by the metallographic microscope configured with a camera, an image is collected by an acquisition system; a color identification graph for a quantitative analysis of ferrite can be obtained by using metallographic examination analysis software, and finally, ferrite phase area percentage can be measured. According to the method, phase structures in the double-phase stainless steel present different colors, edge is clear and is easily identified; qualitative and quantitative analysis can be carried out on each phase structure, accuracy of quantification result is high; etching time is short, contrast ratio is large, and operation is simple.

Description

technical field [0001] The invention relates to a method for quickly determining the phase content of duplex stainless steel by using metallographic dyeing and software, belonging to the field of metal material analysis, and specifically applied to the quantitative determination of ferrite phase in duplex stainless steel. Background technique [0002] In the solid solution structure of duplex stainless steel, the ferrite phase and the austenite phase each account for about half, and the content of the general minor phase also needs to reach 30%. This type of steel has the characteristics of both austenitic and ferritic stainless steel. Compared with ferrite, it has higher plasticity and toughness, no room temperature brittleness, significantly improved intergranular corrosion resistance and welding performance, and has superplasticity and other characteristics. . The content, morphology, size, and state of ferrite in duplex stainless steel play a key role in its mechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/30G01N1/32G01N21/84
Inventor 王永胜王宏霞王俊海张爽吴月龙宋文红
Owner SHANDONG TAISHAN STEEL GROUP
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