CN109115576A - A kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample - Google Patents
A kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample Download PDFInfo
- Publication number
- CN109115576A CN109115576A CN201811093752.1A CN201811093752A CN109115576A CN 109115576 A CN109115576 A CN 109115576A CN 201811093752 A CN201811093752 A CN 201811093752A CN 109115576 A CN109115576 A CN 109115576A
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- China
- Prior art keywords
- sample
- 40crnimoa
- preparation
- steel
- polishing
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Classifications
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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
-
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- 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
-
- 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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
Abstract
The present invention relates to a kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample, the pre-treatment including sample, the preparation of metallographic sample grinds and polishes, the burn into drying of sample.The present invention passes through to hydrochloric acid, copper sulphate, additive rational proportion, and the appropriate selection of forms of corrosion, the grain boundary of 40CrNiMoA steel can be clearly indicated out, complete grain size and distributed intelligence are obtained, to its service performance is inferred, optimizes heat treatment process and important evidence is provided.
Description
Technical field
The invention belongs to aeronautical materials to test field, be related to a kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample.
Background technique
It is well known that the grain size size and uniformity of steel all have a great impact to the various performance indicators of steel, in reality
It is of great significance in the production of border.For by the 40CrNiMoA steel of quenching and tempering, crystal grain is too big, not only results in
The poor performance of 40CrNiMoA steel, and can seriously restrict the service life of 40CrNiMoA steel.Therefore, it can clearly show
The grain boundary of 40CrNiMoA steel obtains complete grain size and distributed intelligence, and can become finally obtain accurately,
The key of reliable estimation result.
Summary of the invention
The purpose of invention
When showing the present invention overcomes existing common oxidizing process progress crystal grain, an appropriate inclined small mill can only be ground
Face, in grinding process, the amount of grinding number vary with each individual, sample preparation failure is easily caused, even and if appropriate inclined sample
It is successfully prepared, in subsequent grain size grading, cannot accurately show the defect of grain size.
Technical solution
The present invention can be implemented by the following technical programs.A kind of preparation side of 40CrNiMoA crystalline grain of steel degree sample is provided
Method includes the following steps:
A) steel sample pre-treatment
Grain size sample is cut on 40CrNiMoA steel material, grain size sample is heat-treated, heating temperature 860
DEG C ± 10 DEG C, heating time 1 hour, water cooling later；
B) metallographic specimen grinds polishing:
The sample is roughly ground, corase grinding use 180# silicon carbide paper, later successively with 400#, 600#, 800#,
1000# silicon carbide paper carries out fine grinding, and in corase grinding and fine grinding, sample is ground in the same direction, and every replacement is primary
Sand paper must clean sample, and using the normal direction of abradant surface as rotation center, and the sample is rotated 45 °~90 °, so that
The polishing scratch of previous sand paper is gone to the greatest extent；
After the sample ground is cleaned, bright and clean mirror surface is polished on polishing disk；
C) the burn into drying of sample:
Using salt acid analysis, pure, copper sulphate and distilled water are configured to corrosive liquid, and the sample after polishing is put into corrosive liquid,
And 60 °~70 ° are heated to, and at least 5 minutes are kept the temperature, it is dry after the sample water and alcohol that have corroded successively are cleaned.
Further, in polishing, successively selecting granularity is respectively that the diamond of 2.5um, 1.5um, 0.5um are sprayed conduct
Polishing agent.
Further, using 20ml salt acid analysis, pure, 10g copper sulphate and distilled water are configured to corrosive liquid described in 100ml.
Further, 65 ° are heated in step c).
Beneficial effect
The present invention provides a kind of methods of simple and easy, visual and clear display 40CrNiMoA crystalline grain of steel size.
Detailed description of the invention
Fig. 1 is rear 40CrNiMoA crystalline grain of steel degree display figure handled by the method for the present invention；
Specific embodiment
It elaborates with reference to the accompanying drawing with specific implementation method to the present invention:
A kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample is provided, is included the following steps:
Step 1: steel sample pre-treatment
Grain size sample is cut on 40CrNiMoA steel material, grain size sample is heat-treated, heating temperature 860
DEG C ± 10 DEG C, heating time 1 hour, water cooling later；
Step 2: metallographic specimen grinds polishing:
The sample is roughly ground, corase grinding use 180# silicon carbide paper, later successively with 400#, 600#, 800#,
1000# silicon carbide paper carries out fine grinding, and in corase grinding and fine grinding, sample is ground in the same direction, and every replacement is primary
Sand paper must clean sample, and using the normal direction of abradant surface as rotation center, and the sample is rotated 45 °~90 °, so that
The polishing scratch of previous sand paper is gone to the greatest extent；After the sample ground is cleaned, bright and clean mirror surface is polished on polishing disk；
Step 3: the burn into of sample dries up:
Using salt acid analysis, pure, copper sulphate and distilled water are configured to corrosive liquid, and the sample after polishing is put into corrosive liquid,
And 60 °~70 ° are heated to, and at least 5 minutes are kept the temperature, it is dry after the sample water and alcohol that have corroded successively are cleaned.
Further, in polishing, successively selecting granularity is respectively that the diamond of 2.5um, 1.5um, 0.5um are sprayed conduct
Polishing agent.
Further, using 20ml salt acid analysis, pure, 10g copper sulphate and distilled water are configured to corrosive liquid described in 100ml.
Further, 65 ° are heated in step c).
Sample observation and grain size statistics: the sample corroded is placed directly in metallography microscope under the microscope, and is clapped respectively
100 times of metallograph is taken the photograph, sample metallograph carries out grain size statistics using image analysis software and concentric three circles resection,
Mean intercept 4.0689um is measured, grain size average level is 8.5 grades.
Claims (4)
1. a kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample, includes the following steps:
Step 1: steel sample pre-treatment
Cut grain size sample on 40CrNiMoA steel material, grain size sample be heat-treated, heating temperature be 860 DEG C ±
10 DEG C, heating time 1 hour, water cooling later；
Step 2: metallographic specimen grinds polishing:
The sample is roughly ground, corase grinding uses 180# silicon carbide paper, successively uses 400#, 600#, 800#, 1000# water later
Dry sanding paper carries out fine grinding, and in corase grinding and fine grinding, sample is ground in the same direction, and sand paper of every replacement, palpus
Sample is cleaned, and using the normal direction of abradant surface as rotation center, the sample is rotated 45 °~90 °, so that previous sand paper
Polishing scratch go to the greatest extent；After the sample ground is cleaned, bright and clean mirror surface is polished on polishing disk；
Step 3: the burn into of sample dries up:
Using salt acid analysis, pure, copper sulphate and distilled water are configured to corrosive liquid, and the sample after polishing is put into corrosive liquid, and add
Heat keeps the temperature at least 5 minutes to 60 °~70 °, dry after the sample water and alcohol that have corroded successively are cleaned.
2. a kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample as claimed in claim, it is characterised in that: polishing
When, successively selecting granularity is respectively that the diamond of 2.5um, 1.5um, 0.5um are used as polishing agent by spraying.
3. a kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample as claimed in claim, it is characterised in that: use 20ml
Salt acid analysis is pure, 10g copper sulphate and distilled water are configured to corrosive liquid described in 100ml.
4. a kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample as claimed in claim, it is characterised in that: in step c)
It is heated to 65 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811093752.1A CN109115576A (en) | 2018-09-19 | 2018-09-19 | A kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811093752.1A CN109115576A (en) | 2018-09-19 | 2018-09-19 | A kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample |
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| Publication Number | Publication Date |
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| CN109115576A true CN109115576A (en) | 2019-01-01 |
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| CN201811093752.1A Pending CN109115576A (en) | 2018-09-19 | 2018-09-19 | A kind of preparation method of 40CrNiMoA crystalline grain of steel degree sample |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252410A (en) * | 2021-03-26 | 2021-08-13 | 陕西飞机工业有限责任公司 | Preparation method of 40CrNiMoA steel bolt forging fine macroscopic sample |
| CN114112607A (en) * | 2021-11-08 | 2022-03-01 | 陕西飞机工业有限责任公司 | Preparation method of high-power bolt sample |
| CN114112606A (en) * | 2021-11-08 | 2022-03-01 | 陕西飞机工业有限责任公司 | Preparation method of titanium alloy bolt head crystal grain streamline sample |
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| CN101368889A (en) * | 2008-09-24 | 2009-02-18 | 上海大学 | Method for displaying high-strength vessel slab original austenite crystal grain |
| CN102221495A (en) * | 2011-03-31 | 2011-10-19 | 洛阳Lyc轴承有限公司 | Method for displaying original austenite grain boundary of 40Cr15Mo2VN bearing steel |
| CN102721593A (en) * | 2012-06-27 | 2012-10-10 | 北京科技大学 | Method for displaying original austenitic grain boundary of martensitic heat-resistant steel |
| CN103512792B (en) * | 2013-10-15 | 2015-12-02 | 北京科技大学 | The method of the GCr15SiMn steel original austenite grains of display pearlite state |
| CN109425564A (en) * | 2017-09-02 | 2019-03-05 | 广东韶钢松山股份有限公司 | A kind of SAE6150 spring steel wire rod autstenitic grain size detection method |
-
2018
- 2018-09-19 CN CN201811093752.1A patent/CN109115576A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368889A (en) * | 2008-09-24 | 2009-02-18 | 上海大学 | Method for displaying high-strength vessel slab original austenite crystal grain |
| CN102221495A (en) * | 2011-03-31 | 2011-10-19 | 洛阳Lyc轴承有限公司 | Method for displaying original austenite grain boundary of 40Cr15Mo2VN bearing steel |
| CN102721593A (en) * | 2012-06-27 | 2012-10-10 | 北京科技大学 | Method for displaying original austenitic grain boundary of martensitic heat-resistant steel |
| CN103512792B (en) * | 2013-10-15 | 2015-12-02 | 北京科技大学 | The method of the GCr15SiMn steel original austenite grains of display pearlite state |
| CN109425564A (en) * | 2017-09-02 | 2019-03-05 | 广东韶钢松山股份有限公司 | A kind of SAE6150 spring steel wire rod autstenitic grain size detection method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252410A (en) * | 2021-03-26 | 2021-08-13 | 陕西飞机工业有限责任公司 | Preparation method of 40CrNiMoA steel bolt forging fine macroscopic sample |
| CN114112607A (en) * | 2021-11-08 | 2022-03-01 | 陕西飞机工业有限责任公司 | Preparation method of high-power bolt sample |
| CN114112606A (en) * | 2021-11-08 | 2022-03-01 | 陕西飞机工业有限责任公司 | Preparation method of titanium alloy bolt head crystal grain streamline sample |
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Application publication date: 20190101 |