Gold phase tissue method for displaying martensite-austenite phase of steel

Abstract

The invention discloses a gold phase tissue method for displaying martensite-austenite phases of steel. The method comprises the following steps of: immersing a to-be-tested sample into a mixed corrosive liquid of a certain proportion of Na<2>S<2>O<5>.5H<2>O aqueous solution and a picric acid alcohol solution; washing and blow-drying; and observing the tissue morphology of the sample by a microscope. According to the gold phase tissue method for displaying the martensite-austenite phases of the steel, the multiphase tissue in the steel particularly the M-A (Martensite Austenite island) islandsphases in the tissue can be corroded by using a specific steel sample corrosion liquid; the visualization effect is remarkable, and the analysis of the distribution, the shape, and the size of the M-A islands in the steel are very good; and quantitative analysis can be performed, the correlation between the percentage content of the multiphase tissue and the steel performance can be effectively established, and the control of the actual production is facilitated.

Description

technical field

[0001] The invention relates to the technical field of iron and steel materials, in particular to a metallographic structure method for displaying the martensite-austenite phase of iron and steel. Background technique

[0002] With the development of material science, the requirements for the analysis of material microstructure are getting higher and higher, and people's eyes distort many real tissue states when identifying phases. The internal structure of metal materials is directly and closely related to material properties such as hardness, strength, and ductility, and metallographic observation is the most effective method for studying the internal structure of metal materials. The amount of phase content in the structure will directly affect the final performance of the steel, so it is very necessary to display the amount of hard phase and soft phase in the structure. The quantitative evaluation of the hard phase in multi-phase steel is a deeper researc...

Examples

Embodiment 1

[0023] The weight percentage is 0.8~1.2% Na 2 S 2 o 5 .5H 2 O solution and picric acid alcohol solution with a weight percentage of 2% to 3% are mixed at a volume ratio of 1:1 to obtain a corrosion solution; the steel sample containing the metallographic structure of Q550D is polished, and the sample is flattened with a grinder The surface is finally ground with coarse to fine sandpaper (sandpaper numbers are 240, 320, 500, 600 in turn), and after grinding, use metallographic polishing agent (the main component is diamond) to polish on the polishing machine, and water to moisten The wet agent is sprayed on the flannelette for wetting, and the steel sample is pressed and polished on the flannelette. The mechanical polishing time is 1 to 10 minutes; the polished steel sample is immersed in the corrosive agent in parallel, and the polished surface (for metallographic observation) Surface) facing down, the steel sample is immersed in the corrosive agent to a depth of 2 to 4mm, ...

Embodiment 2

[0025] The weight percentage is 0.8~1.2% Na 2 S 2 o 5 .5H 2 O solution and picric acid alcohol solution with a weight percentage of 2% to 3% are mixed at a volume ratio of 1:1 to obtain a corrosion solution; the steel sample containing the X80 metallographic structure is polished, and the sample is flattened with a grinder The surface is finally ground with coarse to fine sandpaper (sandpaper numbers are 240, 320, 500, 600 in turn), and after grinding, use metallographic polishing agent (the main component is diamond) to polish on the polishing machine, and water to moisten The wet agent is sprayed on the flannelette for wetting, and the steel sample is pressed and polished on the flannelette. The mechanical polishing time is 1 to 10 minutes; the polished steel sample is immersed in the corrosive agent in parallel, and the polished surface (for metallographic observation) Surface) facing down, the steel sample is immersed in the corrosive agent to a depth of 2 to 4mm, dippe...

technical field

[0001] The invention relates to the technical field of iron and steel materials, in particular to a metallographic structure method for displaying the martensite-austenite phase of iron and steel. Background technique

[0002] With the development of material science, the requirements for the analysis of material microstructure are getting higher and higher, and people's eyes distort many real tissue states when identifying phases. The internal structure of metal materials is directly and closely related to material properties such as hardness, strength, and ductility, and metallographic observation is the most effective method for studying the internal structure of metal materials. The amount of phase content in the structure will directly affect the final performance of the steel, so it is very necessary to display the amount of hard phase and soft phase in the structure. The quantitative evaluation of the hard phase in multi-phase steel is a deeper researc...

Examples

Embodiment 1

[0023] The weight percentage is 0.8~1.2% Na 2 S 2 o 5 .5H 2 O solution and picric acid alcohol solution with a weight percentage of 2% to 3% are mixed at a volume ratio of 1:1 to obtain a corrosion solution; the steel sample containing the metallographic structure of Q550D is polished, and the sample is flattened with a grinder The surface is finally ground with coarse to fine sandpaper (sandpaper numbers are 240, 320, 500, 600 in turn), and after grinding, use metallographic polishing agent (the main component is diamond) to polish on the polishing machine, and water to moisten The wet agent is sprayed on the flannelette for wetting, and the steel sample is pressed and polished on the flannelette. The mechanical polishing time is 1 to 10 minutes; the polished steel sample is immersed in the corrosive agent in parallel, and the polished surface (for metallographic observation) Surface) facing down, the steel sample is immersed in the corrosive agent to a depth of 2 to 4mm, ...

Embodiment 2

[0025] The weight percentage is 0.8~1.2% Na 2 S 2 o 5 .5H 2 O solution and picric acid alcohol solution with a weight percentage of 2% to 3% are mixed at a volume ratio of 1:1 to obtain a corrosion solution; the steel sample containing the X80 metallographic structure is polished, and the sample is flattened with a grinder The surface is finally ground with coarse to fine sandpaper (sandpaper numbers are 240, 320, 500, 600 in turn), and after grinding, use metallographic polishing agent (the main component is diamond) to polish on the polishing machine, and water to moisten The wet agent is sprayed on the flannelette for wetting, and the steel sample is pressed and polished on the flannelette. The mechanical polishing time is 1 to 10 minutes; the polished steel sample is immersed in the corrosive agent in parallel, and the polished surface (for metallographic observation) Surface) facing down, the steel sample is immersed in the corrosive agent to a depth of 2 to 4mm, dippe...

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