CN106370499A - Austenite crystal boundary corrosion method after carburizing and quenching - Google Patents
Austenite crystal boundary corrosion method after carburizing and quenching Download PDFInfo
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- CN106370499A CN106370499A CN201610721579.XA CN201610721579A CN106370499A CN 106370499 A CN106370499 A CN 106370499A CN 201610721579 A CN201610721579 A CN 201610721579A CN 106370499 A CN106370499 A CN 106370499A
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- 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
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Abstract
The invention relates to the technical field of corrosion of austenite crystal boundary of carbon steel after carburizing and quenching and particularly provides an austenite crystal boundary corrosion method after carburizing and quenching. The method can basically achieve that the austenite crystal boundary of a sample can be observed under a microscope just through one corrosion step. The method includes the steps of: 1) mixing and stirring sodium dodecyl benzene sulfonate, picric acid, a 35% hydrochloric acid solution, and water to obtain a corrosive agent solution, wherein the weight ratio of the sodium dodecyl benzene sulfonate to the picric acid is 1:2, the volume ratio of the hydrochloric acid solution to the water is 1:20, and 1 g of the sodium dodecyl benzene sulfonate is corresponding to 100 ml of water; 2) heating the corrosive agent solution to 45-65 DEG C; 3) soaking the sample into the heated corrosive agent solution for 10-60 s and taking the sample out until the color turns into grey; and 4) washing the sample to remove residual corrosive agent solution by anhydrous ethanol; and 5) drying the sample with hot air so as to observe the austenite crystal boundary under the microscope.
Description
Technical field
The present invention relates to the corrosion technology field of carbon steel austenite grain boundary after carburizing and quenching, specially a kind of carburizing and quenching
Austenite grain boundary caustic solution afterwards.
Background technology
Autstenitic grain size inspection after Carburization Treatment has very important meaning to the process control of Carburization Treatment, passes
The caustic solution of system mainly mixes the sample with picrate acid solution and is corroded, and because after single corrosion, success rate is low, needs
The austenite grain boundary carburized parts just can be corroded, efficiency is too low after test is repeated several times.
Content of the invention
In order to solve the above problems, the invention provides austenite grain boundary caustic solution after a kind of carburizing and quenching, it can
Substantially realize sample and just can examine under a microscope austenite grain boundary through once corrosion.
Its technical scheme be such that a kind of carburizing and quenching after austenite grain boundary caustic solution it is characterised in that include with
Lower step:
(1) dodecylbenzene sodium sulfonate, picric acid, 35% hydrochloric acid solution, water mix and blend are formed caustic solution, wherein
For 1:2, hydrochloric acid and the volume ratio of water are 1:20 to dodecylbenzene sodium sulfonate and picric weight ratio, 1g DBSA
Sodium corresponds to 100ml water；
(2) caustic solution in step (1) is heated to 45 ~ 65 DEG C；
(3) by sample immerse in step (2) heated after caustic in 10 ~ 60s, until sample become grey after take out sample
Product；
(4) wash away remaining caustic solution on sample by sample and with dehydrated alcohol；
(5) sample preparation after sample hot-air seasoning is completed, you can examine under a microscope austenite grain boundary.
It is further characterized by, and also includes polishing step, concretely comprises the following steps: by sample between step (4) and step (5)
It is positioned over polishing 3 ~ 5s on non-rotary polishing cloth and remove caustic solution further；
Water in step (1) is distilled water；
In step (2), caustic solution passes through heating in water bath；
In step (3), sample takes out sample after becoming middle Lycoperdon polymorphum Vitt；
The time that in step (4), dehydrated alcohol washes away sample is 3 ~ 5s；
In step (5), sample is dried and is realized by heat gun, and drying time is 10 ~ 12s；
Observe after the completion of sample preparation in step (5) austenite grain boundary effect undesirable when (5) can be arrived until permissible with repeat step (3)
Examine under a microscope austenite grain boundary；
Microscopical amplification is to amplify 500 times.
After the method for the present invention, add the picrate acid solution corrosive nature of dodecylbenzene sodium sulfonate significantly
Lifting, removes after sample variable color and washes away caustic solution using dehydrated alcohol, using hot blast drying so that except water speed soon, no
Water stain impact sample preparation effect can be left, sample just can examine under a microscope austenite grain boundary through so once corroding, and becomes
Power reaches 90%.
Brief description
Fig. 1 is schematic flow sheet of the present invention；
Fig. 2 is corrosive effect figure.
Specific embodiment
As shown in Figure 1,1g dodecylbenzene sodium sulfonate, 2g picric acid, 5 hydrochloric acid (about 5ml), 100ml are distilled by (1)
Water mix and blend forms caustic solution；
(2) by the caustic solution heating in water bath in step (1) to 45 ~ 65 DEG C；
(3) by sample be completely immersed in step (2) heated after caustic in 10 ~ 60s, take after sample becomes middle Lycoperdon polymorphum Vitt
Go out sample；
(4) wash away remaining caustic solution on sample by sample and with dehydrated alcohol；
In order to reach preferable corrosive effect, the sample obtaining can be positioned over non-rotary polishing cloth upthrow in step (4)
Light 3 ~ 5s removes caustic solution further；
(5) sample preparation after the drying of sample heat gun is completed, you can examine under a microscope austenite grain boundary.
If observe austenite grain boundary effect undesirable when (5) can be arrived several times until can be micro- with repeat step (3)
Microscopic observation is to austenite grain boundary.
In Fig. 2 material be 20crnimo through carburizing and quenching and after the caustic solution of the present invention through 500 times of amplifications
The design sketch that the microscope of multiple is observed, can be clearly seen austenite grain boundary from figure.
Claims (9)
1. after a kind of carburizing and quenching austenite grain boundary caustic solution it is characterised in that comprising the following steps:
(1) dodecylbenzene sodium sulfonate, picric acid, 35% hydrochloric acid solution, water mix and blend are formed caustic solution, wherein
For 1:2, hydrochloric acid and the volume ratio of water are 1:20 to dodecylbenzene sodium sulfonate and picric weight ratio, 1g DBSA
Sodium corresponds to 100ml water；
(2) caustic solution in step (1) is heated to 45 ~ 65 DEG C；
(3) by sample immerse in step (2) heated after caustic in 10 ~ 60s, until sample become grey after take out sample
Product；
(4) wash away remaining caustic solution on sample by sample and with dehydrated alcohol；
(5) sample preparation after sample hot-air seasoning is completed, you can examine under a microscope austenite grain boundary.
2. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that step (4)
And step also includes polishing step between (5), concretely comprises the following steps: sample is positioned over polishing 3 ~ 5s on non-rotary polishing cloth and enters
One step removes caustic solution.
3. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that step (1)
In water be distilled water.
4. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that step (2)
Middle caustic solution passes through heating in water bath.
5. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that step (3)
Middle sample takes out sample after becoming middle Lycoperdon polymorphum Vitt.
6. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that step (4)
The time that middle dehydrated alcohol washes away sample is 3 ~ 5s.
7. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that step (5)
Middle sample is dried and is realized by heat gun, and drying time is 10 ~ 12s.
8. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that step (5)
Observe after the completion of middle sample preparation austenite grain boundary effect undesirable when (5) can be arrived until can be under the microscope with repeat step (3)
Observe austenite grain boundary.
9. after a kind of carburizing and quenching according to claim 1 austenite grain boundary caustic solution it is characterised in that microscopical
Amplification is to amplify 500 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610721579.XA CN106370499A (en) | 2016-08-25 | 2016-08-25 | Austenite crystal boundary corrosion method after carburizing and quenching |
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| CN201610721579.XA CN106370499A (en) | 2016-08-25 | 2016-08-25 | Austenite crystal boundary corrosion method after carburizing and quenching |
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| CN105300774A (en) * | 2014-07-18 | 2016-02-03 | 中国科学院金属研究所 | Display method of F/M heat resistant steel welded joint heat affected zone original austenite grain boundary |
| CN105420731A (en) * | 2015-12-29 | 2016-03-23 | 南京科润工业介质股份有限公司 | Metallographic corrosion liquid suitable for displaying quenching state grain boundaries of multiple types of steel workpieces and preparation method thereof |
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| CN101025391A (en) * | 2007-03-13 | 2007-08-29 | 北京科技大学 | Method for making super-low carbon steel gold-phase sample and displaying its tissue |
| CN101187606A (en) * | 2007-11-30 | 2008-05-28 | 洛阳轴研科技股份有限公司 | Metallographic etched process for displaying G Cr15 original austenite grain border |
| CN101368889A (en) * | 2008-09-24 | 2009-02-18 | 上海大学 | Method for displaying high-strength vessel slab original austenite crystal grain |
| CN102517586A (en) * | 2011-12-26 | 2012-06-27 | 上海锅炉厂有限公司 | Corrosive agent for displaying 9% Cr steel original austenite grain boundary and application thereof |
| CN103175726A (en) * | 2013-03-12 | 2013-06-26 | 上海大学 | Metallographic corrosion method for clearly displaying original austenite grain boundary of NiCrMoV type rotor steel |
| CN103344532A (en) * | 2013-06-19 | 2013-10-09 | 武汉理工大学 | Rapid metallographic determination method for grain size of GCr15 steel bearing assembly |
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