CN110068492A - A kind of metallographic etching agent and its application method for the dyeing of advanced high-strength steel retained austenite - Google Patents
A kind of metallographic etching agent and its application method for the dyeing of advanced high-strength steel retained austenite Download PDFInfo
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- CN110068492A CN110068492A CN201810068253.0A CN201810068253A CN110068492A CN 110068492 A CN110068492 A CN 110068492A CN 201810068253 A CN201810068253 A CN 201810068253A CN 110068492 A CN110068492 A CN 110068492A
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- etching agent
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- 238000005530 etching Methods 0.000 title claims abstract description 111
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 50
- 239000010959 steel Substances 0.000 title claims abstract description 50
- 229910001566 austenite Inorganic materials 0.000 title claims abstract description 39
- 230000000717 retained effect Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004043 dyeing Methods 0.000 title claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 74
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000001476 alcoholic effect Effects 0.000 claims abstract description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000004094 surface-active agent Substances 0.000 claims abstract description 13
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910021592 Copper(II) chloride Inorganic materials 0.000 claims description 2
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 claims description 2
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 2
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims 1
- 229910000734 martensite Inorganic materials 0.000 abstract description 25
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 21
- 229910001563 bainite Inorganic materials 0.000 abstract description 16
- 239000003086 colorant Substances 0.000 abstract description 7
- 239000003518 caustics Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 17
- 238000005260 corrosion Methods 0.000 description 10
- 230000007797 corrosion Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 229910000975 Carbon steel Inorganic materials 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 5
- 239000010931 gold Substances 0.000 description 5
- 229910052737 gold Inorganic materials 0.000 description 5
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 4
- 239000010962 carbon steel Substances 0.000 description 4
- 235000019441 ethanol Nutrition 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000011017 operating method Methods 0.000 description 3
- -1 Ethyl alcohol Chemical compound 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000004069 differentiation Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000010938 white gold Substances 0.000 description 2
- 229910000832 white gold Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013256 coordination polymer Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- VDQVEACBQKUUSU-UHFFFAOYSA-M disodium;sulfanide Chemical compound [Na+].[Na+].[SH-] VDQVEACBQKUUSU-UHFFFAOYSA-M 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- OXNIZHLAWKMVMX-UHFFFAOYSA-N picric acid Chemical compound OC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 description 1
- 229940001584 sodium metabisulfite Drugs 0.000 description 1
- 235000010262 sodium metabisulphite Nutrition 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/30—Staining; Impregnating ; Fixation; Dehydration; Multistep processes for preparing samples of tissue, cell or nucleic acid material and the like for analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Investigating And Analyzing Materials By Characteristic Methods (AREA)
Abstract
The invention discloses a kind of metallographic etching agents for the dyeing of advanced high-strength steel retained austenite, are configured by alcoholic solution and surfactant；Wherein each composition quality per distribution ratio of alcoholic solution are as follows: sulfuric acid 3.5-15%；Hydrochloric acid 12-15%；FeCl37-10%；Surplus is absolute alcohol.In addition, the invention also discloses the application methods of above-mentioned metallographic etching agent, comprising steps of polished metallographic specimen is immersed a period of time in the metallographic etching agent, then cleans, dries up metallographic specimen surface, observed on colored microscope.The metallographic etching agent stability is good, formula is simple, and in practical application, the various tissues of steel are corroded enough contrasts out and effectively distinguished to it by the metallographic etching agent, especially when advanced high-strength steel carries out etching pit using the metallographic etching agent, bainite, martensite, ferrite and the tissue of retained austenite, which are all shown, in metallographic structure comes, and shows different colors.
Description
Technical field
The present invention relates to a kind of corrosive agent and its application method more particularly to a kind of corrosive agent suitable for steel grade and its make
Use method.
Background technique
Advanced high-strength steel mainly passes through phase transformation and is strengthened, therefore its tissue is relative complex.Contain in advanced high-strength steel structure
Martensite, ferrite, bainite and/or retained austenite, main Grades Series include dual phase steel (DP), twinning induced plasticity
(TRIP) steel, Multiphase Steel (CP), quenching partition steel (QP steel) and martensite grade steel (Mart) etc..The advanced high-strength steel of automobile
(AHSS) it is divided into hot rolling, cold rolling and hot dip zinc product, process characteristic is all to realize to strengthen by phase transformation.Advanced high-strength steel resists
Tensile strength can be up to 1000MPa or more, high-intensitive in order to reach, and need to be added more alloying element, and in strict control
Reach reasonable service performance after hot rolling, annealing and cold-rolling process.
The microstructure composition of advanced high-strength steel is complex, and according to the difference of service performance, to its ingredient score
Control has more strict requirements, and wherein the content, volume, morphology and size of retained austenite play important work to the performance of steel
With, therefore, research and application tool important function of the quantitative analysis retained austenite for advanced high-strength steel.
Metallographic method is a kind of common tissue characterization method, but for advanced high-strength steel, the difficult point of etching pit is in corruption
Make there are enough contrast differences between different tissues after erosion, i.e., simultaneously various tissues is accurately distinguished out, especially therein
Retained austenite and other tissue divisions come.
In general, mainly including black and white metallographic method and color metellography to the caustic solution of steel.
Black and white metallographic method is suitable for most carbon steels, and common corrosive agent is the nital of 2-5%, black and white gold
Phase method is easier to distinguish ferrite and carbide, because the ferrite after corrosion is white, carbide is black, and according to carbon
The distributional pattern of compound can further discriminate between the tissue morphologies such as bainite, martensite, pearlite.But black and white metallographic method is difficult area
Point retained austenite, this is because retained austenite use after conventional nital corrosion as light gray, this and iron are plain
Body is without enough contrast differences, and the ferrite grain size after retained austenite and cold working is also not much different, with black and white gold
In addition phase method identifies retained austenite using other supplementary means such as X-ray diffraction methods to generally require when identifying tissue,
It is relatively complicated, therefore color metellography is more common when identifying heterogeneous structure.
Color metellography is to make each phase under the metallographic microscope configured with colour imagery shot using certain corrosive agent
Different colours are showed, enough contrasts is formed to be distinguish to the organizational composition of steel, can also further utilize microscope
Matched Metallographic Analysis software quantitative determines the volume fraction of each phase.Therefore, the key of color metellography is corrosive agent
Formula and its application method.
At present in color metellography, dyeing for retained austenite in advanced high-strength steel, currently used corrosive agent is
Lepera reagent uses 1-4% (NO2)3C6H2OH (picric acid) plus supersaturation Na2S2O3(Sodium Metabisulfite) aqueous solution,
Using 1:1 after evenly mixing as corrosive agent, then sample is immersed in corrosive liquid and is corroded, sample is made to glow gloss as Blue Curacao.It is rotten
After erosion, ferrite is blue, bainite brown, martensite at white, retained austenite are grey.However, using this kind of colour
Metallographic method has two, and one is that corrosive agent stability is inadequate, even if the accurate control corrosion rate time, many times
Effectively tissue cannot be corroded out；Secondly for the contrast difference of retained austenite and martensite or smaller, in many cases
It can't effectively distinguish.
Based on this, it is expected that obtaining a kind of metallographic etching agent, which is identifying microcosmic group of steel grade for metallographic method
It knits, when in particular for advanced high-strength steel, the various tissues of steel grade can be corroded enough contrasts out and it is effectively distinguished,
And the etching pit agent prescription is simple, configuration is convenient, stability is good.
Summary of the invention
One of the objects of the present invention is to provide it is a kind of for advanced high-strength steel retained austenite dyeing metallographic etching agent,
The metallographic etching agent stability is good, and formula is simple, and configuration is convenient, and in practical application, the metallographic etching agent the various of steel
Tissue corrodes enough contrasts out and effectively distinguishes to it, especially when advanced high-strength steel carries out metallographic using the metallographic etching agent
Bainite, martensite, ferrite and the tissue of retained austenite, which are all shown, when corrosion, in metallographic structure comes, and shows not
Same color, the color distinction of especially retained austenite and martensite is significant, and effect is better than corrosive agent in the prior art.
To achieve the goals above, the invention proposes a kind of metallographic for the dyeing of advanced high-strength steel retained austenite is rotten
Agent is lost, is configured by alcoholic solution and surfactant；Wherein each composition quality per distribution ratio of alcoholic solution are as follows:
Sulfuric acid 3.5-15%；
Hydrochloric acid 12-15%；
FeCl37-10%；
Surplus is absolute alcohol.
Inventor is had found by lot of experiments, passes through metallographic made of alcoholic solution and surfactant configuration
Compared to existing technologies, stability is good for corrosive agent, and formula is simple, and configuration is convenient, and in practical application, institute of the present invention
The various tissues of steel are corroded enough contrasts out and effectively distinguished to it by the metallographic etching agent stated, especially when advanced high-strength steel
When carrying out etching pit using metallographic etching agent of the present invention, bainite, martensite, ferrite and remnants in metallographic structure
The tissue of austenite, which is all shown, to be come, and shows different colors, especially the color distinction of retained austenite and martensite
Significantly, effect is better than corrosive agent in the prior art.
And the design principle of each ingredient of alcoholic solution in the metallographic etching agent of this case is as described below:
Sulfuric acid, hydrochloric acid and FeCl3It is carbon steel metallographic etching agent, for carbon steel, the ethyl alcohol using sulfuric acid or hydrochloric acid is molten
Liquid can effectively distinguish ferrite and carbide, and ferrite is white after corroding, and carbide is black.And FeCl3Ethyl alcohol
Solution corrosion effect is more stronger than both above-mentioned, is suitable for corroding stainless steel or other high-alloy steel, and the diluter sulphur of etching time
Acid or dilute hydrochloric acid corrosion straight carbon steel are long.
For super-high strength steel, because it is summed up, gold content is higher, and especially manganese content is higher, and corrosion resistance is much stronger than general carbon
Steel.Effect is undesirable when above-mentioned three kinds of corrosive agent single uses, one is the corrosion of some tissues, especially retained austenite is not
Out；The second is need to carry out time long corrosion, it is inconvenient for operation.And metallographic etching agent of the present invention is used, it can be very
It solves the above problems well.
When configuring alcoholic solution of the present invention, can using concentrated hydrochloric acid, (such as mass percent is 36.5%, should
Mass percent refers to that hydrochloric acid accounts for the mass percent of its aqueous solution), the concentrated sulfuric acid (such as 98% or more mass percent, the matter
Amount percentage refers to that sulfuric acid accounts for the mass percent of its aqueous solution), surplus uses absolute alcohol, it is therefore an objective to reduction alcohol as far as possible
Moisture in solution, this is because applicant in this case is had found by lot of experiments, when the moisture content in alcoholic solution is got over
Height, when carrying out etching pit for example, by using diluter hydrochloric acid (such as mass percent is 20%), retained austenite (is observed
Complexion color is grey) and the contrast difference of ferrite (the complexion color observed be white) become smaller, or even cannot distinguish between.
Based on the above principles, in order to which the various tissues of steel are corroded enough contrasts out and are effectively distinguished to it, especially
It is when carrying out etching pit for advanced high-strength steel, wherein bainite, martensite, ferrite and the tissue of retained austenite is aobvious
It shows and, and show different colors, inventor passes through metallographic made of being configured as alcoholic solution and surfactant
Corrosive agent dyes advanced high-strength steel retained austenite, wherein each composition quality per distribution ratio of alcoholic solution is controlled are as follows: sulphur
Sour 3.5-15%；Hydrochloric acid 12-15%；FeCl37-10%；Surplus is absolute alcohol, so that respectively organizing in metallographic structure bright
It is aobvious to distinguish.
It should be noted that the mass percent of each ingredient of alcoholic solution refers to sulfuric acid, hydrochloric acid and FeCl3Account for alcohol
The mass percent of overall solution volume.
Further, in metallographic etching agent of the present invention, the proportion of surfactant and alcoholic solution are as follows: every
0.5-1.0 grams of surfactant is added in 100 milliliters of solution.
In the above scheme, etching pit is a chemical reaction process, and the effect of surfactant is to make stable reaction
Occur and surface through corroding allowed to be maintained at same state for a long time, that is, be corrosion reproducibility it is strong.It analyzes by contrast, it is right
In the same position of same sample, it is added after surfactant, the effect after corroding repeatedly is stable, and without surface active
This reinforcing effect is then not achieved in the corrosive agent of agent.
Further, in metallographic etching agent of the present invention, surfactant CuCl2、SnCl3And Na2S's
At least one.
Correspondingly, another object of the present invention is to provide a kind of application methods of above-mentioned metallographic etching agent, in use,
Without heating to metallographic etching agent, used metallographic etching agent can carry out etching pit, operating procedure letter in room temperature
It is single.
In order to achieve the above-mentioned object of the invention, the invention also provides a kind of application method of above-mentioned metallographic etching agent, packets
It includes step: polished metallographic specimen being immersed into a period of time in the metallographic etching agent, then cleans, dry up metallographic specimen table
Face is observed on colored microscope.
In scheme of the present invention, since used metallographic etching agent can carry out etching pit at normal temperature,
Thus, when in use, polished metallographic specimen is immersed to a period of time in above-mentioned metallographic etching agent, it will be able to try metallographic
Various tissues in sample corrode enough contrasts out, and observe on colored microscope and to show each group of different colours
It knits, bainite, martensite, ferrite and retained austenite, retained austenite therein and geneva especially in metallographic structure
Body color distinction is significant, excellent effect.
Further, since the stability of metallographic etching agent of the present invention is good, thus, etching time is easy to accurately control,
Quickly and effectively tissue can be corroded out within a short period of time.
Further, in application method of the present invention, polished metallographic specimen is immersed into the etching pit
Agent 5-20 seconds.
Further, in application method of the present invention, when cleaning metallographic specimen surface, first wash with distilled water,
Then it is cleaned with absolute alcohol.
Metallographic etching agent stability of the present invention for the dyeing of advanced high-strength steel retained austenite is good, formula letter
Single, configuration is convenient, and in practical application, the various tissues of steel are corroded enough contrasts out and right by the metallographic etching agent
It is effectively distinguished, especially when advanced high-strength steel carries out etching pit using the metallographic etching agent, shellfish in metallographic structure
Family name's body, martensite, ferrite and the tissue of retained austenite, which are all shown, to be come, and shows different colors, especially remaining
The color distinction of austenite and martensite is significant, and effect is better than corrosive agent in the prior art.
In addition, metallographic etching agent applicability of the present invention is wide, it is suitable for various advanced high-strength steel grades, such as can use
In dual phase steel, twin crystal inducing plasticity steel, Multiphase Steel and martensite grade steel.
In addition, when using metallographic etching agent of the present invention, without being heated to the metallographic etching agent,
That is used metallographic etching agent can carry out etching pit in room temperature, operating procedure is simple.
Furthermore when carrying out etching pit using metallographic etching agent of the present invention, an etching pit can be only carried out
With regard to realizing effective differentiation ferrite, bainite, martensite and retained austenite.
Detailed description of the invention
Fig. 1 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 1.
Fig. 2 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 2.
Fig. 3 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 3.
Fig. 4 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 4.
Fig. 5 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 5.
Fig. 6 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 6.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment to of the present invention remaining difficult to understand for advanced high-strength steel
The metallographic etching agent and its application method of family name's body dyeing make further explanation, however the explanation and illustration is not to this
The technical solution of invention constitutes improper restriction.
Embodiment 1-6
Table 1 lists the proportion of each ingredient of the metallographic etching agent of embodiment 1-6.
Table 1.
The percent mass proportioning for the metallographic specimen that the metallographic etching agent that table 2 lists embodiment 1-6 is corroded.
Table 2.
The application method of the metallographic etching agent of embodiment 1-6 uses following step:
Metallographic specimen in table 2 is polished, the metallographic specimen obtained after polishing immerses etching pit as listed in table 1
5-20 seconds in agent, then cleaning, drying metallographic specimen surface, are observed on colored microscope.
It should be noted that in some other embodiments, it is first clear with distilled water when cleaning metallographic specimen surface
It washes, is then cleaned with absolute alcohol.
The result observed in colored microscope is referring to Fig. 1 to Fig. 6.Fig. 1 to Fig. 6 respectively illustrates the gold of embodiment 1-6
Phase corrosive agent carries out the tissue of the metallographic specimen after etching pit.
Fig. 1 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 1.
As shown in Figure 1, in carrying out the metallographic specimen after etching pit using the metallographic etching agent of embodiment of this case 1, at A
Show that metallographic structure is retained austenite, it is that brown rolls into a ball cotton-shaped tissue that A, which is in the complexion observed in colored microscope,；At B
Show that metallographic structure is martensite, it is light blue acicular structure that B, which is in the complexion observed in colored microscope,；And it is shown at C
Show that metallographic structure is bainite, it is white lath-like microstructure that C, which is in the complexion observed in colored microscope,.
Fig. 2 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 2.
As shown in Fig. 2, in carrying out the metallographic specimen after etching pit using the metallographic etching agent of embodiment of this case 2, at D
Show that metallographic structure is retained austenite, it is that brown rolls into a ball cotton-shaped tissue that D, which is in the complexion observed in colored microscope,；At E
Show that metallographic structure is martensite, it is light blue acicular structure that E, which is in the complexion observed in colored microscope,；And it is shown at F
Show that metallographic structure is bainite, it is white lath-like microstructure that F, which is in the complexion observed in colored microscope,.
Fig. 3 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 3.
As shown in figure 3, in carrying out the metallographic specimen after etching pit using the metallographic etching agent of embodiment of this case 3, at G
Show that metallographic structure is ferrite, it is white lumps tissue that G, which is in the complexion observed in colored microscope,；It is shown at H
Metallographic structure is martensite, and it is light blue acicular structure that H, which is in the complexion observed in colored microscope,；And it is shown at I
Metallographic structure is bainite, and it is white lath-like microstructure that I, which is in the complexion observed in colored microscope,.
Fig. 4 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 4.
As shown in figure 4, in carrying out the metallographic specimen after etching pit using the metallographic etching agent of embodiment of this case 4, at J
Show that metallographic structure is martensite, it is blue acicular structure that J, which is in the complexion observed in colored microscope,；It is shown at K
Metallographic structure is ferrite, and it is the dotted tissue of white that K, which is in the complexion observed in colored microscope,；And metallographic is shown at M
Tissue is retained austenite, and it is the dotted tissue of black that M, which is in the complexion observed in colored microscope,.
Fig. 5 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 5.
As shown in figure 5, in carrying out the metallographic specimen after etching pit using the metallographic etching agent of embodiment of this case 5, at N
Show that metallographic structure is martensite, it is blue acicular structure that N, which is in the complexion observed in colored microscope,；It is shown at P
Metallographic structure is bainite, and it is white lath-like microstructure that P, which is in the complexion observed in colored microscope,；And gold is shown at Q
Phase constitution is ferrite, and it is white chunks tissue that Q, which is in the complexion observed in colored microscope,.
Fig. 6 shows the tissue that the metallographic specimen after etching pit is carried out using the metallographic etching agent of embodiment of this case 6.
As shown in fig. 6, in carrying out the metallographic specimen after etching pit using the metallographic etching agent of embodiment of this case 6, at R
Show that metallographic structure is retained austenite, it is black bulk tissue that R, which is in the complexion observed in colored microscope,；It is shown at S
Show that metallographic structure is martensite, it is blue acicular structure that S, which is in the complexion observed in colored microscope,；Gold is shown at T
Phase constitution is ferrite, and it is white chunks tissue that T, which is in the complexion observed in colored microscope,；And metallographic group is shown at V
It is woven to bainite, it is white lath-like microstructure that V, which is in the complexion observed in colored microscope,
The metallographic etching agent gold stability that can be seen that each embodiment of this case in conjunction with table 1-2 and Fig. 1 to Fig. 6 is good, formula
Simply, configuration is convenient, and after progress etching pit, and the various tissues of steel are corroded enough contrasts out and are effectively distinguished to it,
Especially when advanced high-strength steel carries out etching pit using the metallographic etching agent, bainite in metallographic structure, martensite,
Ferrite and the tissue of retained austenite, which are all shown, to be come, and shows different colors, especially retained austenite and geneva
The color distinction of body is significant, and effect is better than corrosive agent in the prior art.
In addition, the metallographic etching agent applicability of each embodiment of this case is wide, it is suitable for various advanced high-strength steel grades, such as can be with
For dual phase steel, twin crystal inducing plasticity steel, Multiphase Steel and martensite grade steel.
In addition, when using the metallographic etching agent of each embodiment of this case, without being heated to the metallographic etching agent,
That is used metallographic etching agent can carry out etching pit in room temperature, and operating procedure is simple, carry out etching pit
When, it can only carry out an etching pit and just realize effective differentiation ferrite, bainite, martensite and retained austenite.
It should be noted that prior art part is not limited to given by present specification in protection scope of the present invention
Embodiment, all prior arts not contradicted with the solution of the present invention, including but not limited to first patent document, formerly
Public publication, formerly openly use etc., it can all be included in protection scope of the present invention.
In addition, in this case in the combination of each technical characteristic and unlimited this case claim documented combination or
It is combination documented by specific embodiment, all technical characteristics that this case is recorded can be freely combined in any way
Or combine, unless generating contradiction between each other.
It is also to be noted that embodiment enumerated above is only specific embodiments of the present invention.The obvious present invention is not
Above embodiments are confined to, the similar variation or deformation made therewith are that those skilled in the art can be from present disclosure
It immediately arrives at or is easy to just to associate, be within the scope of protection of the invention.
Claims (6)
1. a kind of metallographic etching agent for the dyeing of advanced high-strength steel retained austenite, which is characterized in that its by alcoholic solution and
Surfactant configures；Wherein each composition quality per distribution ratio of alcoholic solution are as follows:
Sulfuric acid 3.5-15%；
Hydrochloric acid 12-15%；
FeCl37-10%；
Surplus is absolute alcohol.
2. metallographic etching agent as described in claim 1, which is characterized in that the proportion of surfactant and alcoholic solution are as follows: every
0.5-1.0 grams of surfactant is added in 100 milliliters of alcoholic solution.
3. metallographic etching agent as claimed in claim 1 or 2, which is characterized in that surfactant CuCl2、SnCl3And Na2S
At least one.
4. the application method of the metallographic etching agent as described in any one of claim 1-3, which is characterized in that comprising steps of
Polished metallographic specimen is immersed into a period of time in the metallographic etching agent, then cleans, dry up metallographic specimen surface, in coloured silk
It is observed on color microscope.
5. application method as claimed in claim 4, which is characterized in that polished metallographic specimen is immersed the etching pit
Agent 5-20 seconds.
6. application method as claimed in claim 4, which is characterized in that when cleaning metallographic specimen surface, first wash with distilled water,
Then it is cleaned with absolute alcohol.
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| CN113403621B (en) * | 2021-06-07 | 2023-03-14 | 武钢集团昆明钢铁股份有限公司 | Metallographic corrosive agent for austenitic Fe-Mn-Al-C series low-density high-strength steel and preparation method and application thereof |
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| CN114481134A (en) * | 2022-02-10 | 2022-05-13 | 马鞍山钢铁股份有限公司 | Corrosive liquid for displaying austenite grain size of T91 steel and method for displaying austenite grain size of T91 steel |
| CN114481134B (en) * | 2022-02-10 | 2024-04-30 | 马鞍山钢铁股份有限公司 | Corrosive liquid for displaying austenitic grain size of T91 steel and method for displaying austenitic grain size of T91 steel |
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