CN109295456A - A kind of the dendrite corrosive liquid and its application method of precipitation strength martensitic stain less steel - Google Patents
A kind of the dendrite corrosive liquid and its application method of precipitation strength martensitic stain less steel Download PDFInfo
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Abstract
The present invention relates to a kind of dendrite corrosive liquid of precipitation strength martensitic stain less steel and its application methods, belong to continuous casting steel Metallographic Analysis technical field.Dendrite corrosive liquid proportion of the invention are as follows: 2~4g of Sodium Metabisulfite, 5~8ml of hydrochloric acid, 2~4ml of nitric acid, distilled water 75ml sequentially add Sodium Metabisulfite, distilled water, hydrochloric acid, nitric acid into container, and stir evenly.Will test when use sample polishing up immerse corrosive liquid in, stand, it is to be shown go out arborescent structure after, to after corrosion precipitation strength martensitic stain less steel detection faces optical microscopy or scanning electron microscope carry out detection observation.The present invention simply and quickly corrodes out the clearly arborescent structure of precipitation strength martensitic stain less steel, arborescent structure can directly be observed, interdendritic is measured away from as-cast structure quality and the heat treatment of auxiliary evaluation homogenization for evaluating precipitation strength martensitic stain less steel act on the elimination of dendritic segregation.
Description
Technical field
The invention belongs to continuous casting steel Metallographic Analysis technical field more particularly to a kind of branches of precipitation strength martensitic stain less steel
Brilliant corrosive liquid and its application method.
Background technique
Dendrite corrosion macroscopic examination method is the development with continuous casting technology and improved day by day continuous casting billet macroscopic examination side
Method.By observing the solidification arborescent structure of continuous casting billet, equiaxial crystal ratio, measurement column crystal angle excursion and dendrite two can be calculated
The data such as secondary dendritic arm spacing, and then speculate its curing condition.Further to analyze between slab defects and solidified structure
Relevant information, the approach for seeking improvement continuous casting billet quality and measure create advantage.
Precipitation strength martensitic stain less steel may be utilized in fabricating because it is with the characteristics such as good corrosion resisting property and high intensity
Large ship cardan shaft, anti-corrosion ultrahigh pressure vessel valve body, nuclear waste storing bucket, nuclear steam turbine final blades, maritime platform/
The equipment such as helicopter deck or component.
Currently, reported corrosive liquid for precipitation strength martensitic stain less steel kind (C≤0.07, Mn≤1.00, Si≤
1.00, Cr:14~17.5, Ni:3~5.5, Cu:2.5~5) dendrite corrosive effect it is bad.Such as: publication number
CN107014813A discloses " a kind of steel continuous casting billet solidification arborescent structure detection method ", and the corrosive agent which uses is 2%-
6% picric acid, the neopelex of 3%-8%, 86%-95% water, in 60-70 DEG C of corrosion 30-40min.So
And the caustic solution preparation time is long, needs heating and thermal insulation, and not to precipitation strength martensitic stain less steel kind dendrite corrosive effect
It is good.Caustic solution of the another kind about electrolysis of hydrochloric acid, can not also corrode the arborescent structure of precipitation strength martensitic stain less steel kind out.
Summary of the invention
It is analyzed in view of above, the present invention is intended to provide a kind of simplicity, quickly and effectively precipitation strength martensitic stain less steel
Dendrite corrosive liquid and its preparation and application, by directly observing arborescent structure, measurement interdendritic is away from and passing through power spectrum survey
The dry degree of segregation of interdendritic and dendrite is determined, for evaluating the as-cast structure quality of precipitation strength martensitic stain less steel and auxiliary
The heat treatment of evaluation homogenization is helped to act on the elimination of dendritic segregation.
The purpose of the present invention is mainly achieved through the following technical solutions:
A kind of dendrite corrosive liquid of precipitation strength martensitic stain less steel, including Sodium Metabisulfite, hydrochloric acid, nitric acid and distillation
Water.
Further, specific proportion are as follows: 2~4g of Sodium Metabisulfite, 5~8ml of hydrochloric acid, 2~4ml of nitric acid, distilled water
75ml。
Further, the mass fraction of hydrochloric acid is 36~38%, and the mass fraction of the nitric acid is 65~68%.
Further, the ingredient percent range of precipitation strength martensitic stain less steel are as follows: C≤0.07, Mn≤1.00,
Si≤1.00, Cr:14~17.5, Ni:3~5.5, Cu:2.5~5, Nb+Ta:0~0.45 and Nb+Ta>=5C, S<0.03, P<
0.04, Fe is surplus.
A kind of preparation method of the dendrite corrosive liquid of precipitation strength martensitic stain less steel, takes 2~4g of Sodium Metabisulfite, salt
5~8ml of acid, 2~4ml of nitric acid, distilled water 75ml, Sodium Metabisulfite, distilled water, hydrochloric acid, nitric acid are sequentially added into container,
And it stirs evenly.
The corrosive liquid of the proportion, the effect newly configured are best.Therefore the inspection of preferential preparation precipitation strength martensitic stain less steel
Test specimens, rear preparation is used for the dendrite corrosive agent of precipitation strength martensitic stain less steel, ready-to-use.
A kind of application method of the dendrite corrosive liquid of precipitation strength martensitic stain less steel, comprising the following steps:
(1) it prepares the detection sample of precipitation strength martensitic stain less steel: the detection sample being roughly ground, fine grinding, throwing
Light, cleaning and drying；
(2) preparation is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel；
(3) dendrite Corrosion monitoring: the polishing of the detection sample is face-up, it immerses in the dendrite corrosive liquid, stands,
After arborescent structure out to be shown, detection observation is carried out to the burnishing surface.
Further, in step (3), the time of the standing is that 5~30s is first rushed in flowing water after detection sample takes out
Wash clean, then uses alcohol rinse, and drying carries out detection observation.
Further, in step (3), the time of the standing is 30~180s, takes out detection sample, first rushes in flowing water
Wash clean, after on polishing disk gently polish after use water and alcohol rinse, drying, carry out detection observation.
Further, detection observation described in step (3) is direct under 50 times of amplification factor using metallographic microscope
Observation.
Further, detection observation described in step (3) is straight under 25~50 times of amplification factor using scanning electron microscope
Connect observation.
Compared with prior art, the present invention has the beneficial effect that:
Dendrite corrosive liquid and its application method for precipitation strength martensitic stain less steel of the invention can be easy, fast
Speed clearly corrodes precipitation strength martensitic stain less steel as cast condition out and homogenizes the arborescent structure of heat treatment state.
It is easy to operate without processes such as heating；Longest only needs three minutes i.e. corrodible arborescent structure, used times out short；Corrosion
Arborescent structure out is clear, can directly observe arborescent structure, and measurement interdendritic is away from and passing through power spectrum measurement interdendritic and branch
The dry degree of segregation of crystalline substance.To through the homogenization of different process heat treatment after sample corrode, also can directly observe disappearing for dendrite
Except situation, dendrite is measured and evaluated by power spectrum and is done and interdendritic element segregation eradicating efficacy.It can be used in evaluating precipitation strength horse
As-cast structure quality and auxiliary evaluation the homogenization heat treatment of family name's body stainless steel act on the elimination of dendritic segregation etc..
The prior art can not corrode the arborescent structure of precipitation strength martensitic stain less steel out, for example use publication number
" a kind of steel continuous casting billet solidification arborescent structure detection method " disclosed in CN107014813A has no to react for this steel.And it tastes
The caustic solution of examination electrolysis of hydrochloric acid only will cause the appearance of a wide range of point corrosion pit of specimen surface, can not show arborescent structure.
Other features and advantages of the present invention will illustrate in the following description, and part can become from specification
It is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by written specification
And specifically noted structure is achieved and obtained in claims.
Detailed description of the invention
Light microscopic figure in Fig. 1-embodiment 1-1 after the corrosion of precipitation strength martensitic stain less steel；
Light microscopic figure in Fig. 2-embodiment 1-2 after the corrosion of precipitation strength martensitic stain less steel；
Light microscopic figure in Fig. 3-embodiment 1-3 after the corrosion of precipitation strength martensitic stain less steel；
Light microscopic figure in Fig. 4-embodiment 2 after the corrosion of precipitation strength martensitic stain less steel；
Light microscopic figure in Fig. 5-embodiment 3-1 after the corrosion of precipitation strength martensitic stain less steel；
Scanning electron microscope (SEM) photograph in Fig. 6-embodiment 3-1 after the corrosion of precipitation strength martensitic stain less steel；
Light microscopic figure in Fig. 7-embodiment 3-2 after the corrosion of precipitation strength martensitic stain less steel.
Specific embodiment
Below in conjunction with specific embodiment to the dendrite corrosive liquid and its application method of a kind of precipitation strength martensitic stain less steel
It is described in further detail, these embodiments are served only for the purpose for comparing and explaining, the present invention is not limited to these embodiments
In.
The ingredient percent range of precipitation strength martensitic stain less steel are as follows: C≤0.07, Mn≤1.00, Si≤1.00,
Cr:14~17.5, Ni:3~5.5, Cu:2.5~5, Nb+Ta:0~0.45 and Nb+Ta>=5C, S<0.03, P<0.04, Fe are remaining
Amount.The specific embodiment of the invention is by taking 15-5PH steel and 17-4PH steel as an example.
Embodiment 1-1
The present embodiment is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, constituent and proportion are as follows: partially
Sodium bisulfite 2.5g, the pure 5ml of salt acid analysis, nitric acid analyze pure 3ml, water 75ml；The mass fraction of hydrochloric acid is 36~38%, nitre
The mass fraction of acid is 65~68%.
Precipitation strength martensitic stain less steel is 15-5PH steel in this example.
Application method of the present embodiment for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, including following step
It is rapid:
(1) it prepares the detection sample of precipitation strength martensitic stain less steel as cast condition: the detection sample is roughly ground, carefully
Mill, polishing, cleaning (with water or alcohol), drying；
(2) it prepares dendrite corrosive liquid: according to the component proportion of above-mentioned dendrite corrosive liquid, it is sub- that weighting is sequentially added into container
Sodium sulphate, water, hydrochloric acid, nitric acid, stir evenly；
The corrosive liquid, the effect newly configured are best.Therefore the detection sample of preferential preparation precipitation strength martensitic stain less steel,
The dendrite corrosive agent for precipitation strength martensitic stain less steel is prepared afterwards, it is ready-to-use.
(3) dendrite Corrosion monitoring: will test sample, and polishing up, is immersed in corrosive liquid, stand 15s, branch out to be shown
After crystalline substance tissue, detection sample is taken out, is first rinsed well in flowing water, uses alcohol rinse, drying, with metallographic microscope at 50 times afterwards
Amplification factor under directly observe.
Fig. 1 is the light microscopic figure after the corrosion of the present embodiment precipitation strength martensitic stain less steel, by Fig. 1 it is evident that precipitating is strong
Change the dendrite tissue of martensitic stain less steel as cast condition, and can measure secondary dendrite spacing.
Embodiment 1-2
The present embodiment is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, constituent and proportion are as follows: partially
Sodium bisulfite 2.8g, the pure 6ml of salt acid analysis, nitric acid analyze pure 4ml, water 75ml；The mass fraction of hydrochloric acid is 36~38%, nitre
The mass fraction of acid is 65~68%.
Precipitation strength martensitic stain less steel is 15-5PH steel in this example.
Application method of the present embodiment for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, including following step
It is rapid:
(1) it prepares the detection sample of precipitation strength martensitic stain less steel as cast condition: the detection sample is roughly ground, carefully
Mill, polishing, cleaning (with water or alcohol), drying；
(2) preparation is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition: according to above-mentioned dendrite corrosive liquid
Component proportion sequentially adds Sodium Metabisulfite, water, hydrochloric acid, nitric acid into container, stirs evenly；
(3) dendrite Corrosion monitoring: will test sample, and polishing up, is immersed in corrosive liquid, stand 5s, branch out to be shown
After crystalline substance tissue, detection sample is taken out, is first rinsed well in flowing water, uses alcohol rinse, drying, with metallographic microscope at 50 times afterwards
Amplification factor under directly observe.
Fig. 2 is the light microscopic figure after the corrosion of the present embodiment precipitation strength martensitic stain less steel, by Fig. 2 it is evident that precipitating is strong
Change the dendrite tissue of martensitic stain less steel as cast condition, and can measure secondary dendrite spacing.
Embodiment 1-3
The present embodiment is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, constituent and proportion are as follows: partially
Sodium bisulfite 2.8g, the pure 6ml of salt acid analysis, nitric acid analyze pure 4ml, water 75ml；The mass fraction of hydrochloric acid is 36~38%, nitre
The mass fraction of acid is 65~68%.
Precipitation strength martensitic stain less steel is 15-5PH steel in this example.
Application method of the present embodiment for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, including following step
It is rapid:
(1) it prepares the detection sample of precipitation strength martensitic stain less steel as cast condition: the detection sample is roughly ground, carefully
Mill, polishing, cleaning (with water or alcohol), drying；
(2) preparation is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition: according to above-mentioned dendrite corrosive liquid
Component proportion sequentially adds Sodium Metabisulfite, water, hydrochloric acid, nitric acid into container, stirs evenly；
(3) dendrite Corrosion monitoring: will test sample, and polishing up, is immersed in corrosive liquid, stand 30s, branch out to be shown
After crystalline substance tissue, detection sample is taken out, is first rinsed well in flowing water, uses alcohol rinse, drying, with metallographic microscope at 50 times afterwards
Amplification factor under directly observe.
Fig. 3 is the light microscopic figure after the corrosion of the present embodiment precipitation strength martensitic stain less steel, by Fig. 3 it is evident that precipitating is strong
Change the dendrite tissue of martensitic stain less steel as cast condition, and can measure secondary dendrite spacing.
Embodiment 2
The present embodiment for precipitation strength martensitic stain less steel homogenization heat treatment state dendrite corrosive liquid, constituent and
Proportion are as follows: Sodium Metabisulfite 3g, the pure 8ml of salt acid analysis, nitric acid analyze pure 4ml, water 75ml；The mass fraction of hydrochloric acid be 36~
38%, the mass fraction of nitric acid is 65~68%.
Precipitation strength martensitic stain less steel is 17-4PH steel in this example.
Application method of the present embodiment for the dendrite corrosive liquid of precipitation strength martensitic stain less steel homogenization heat treatment state,
The following steps are included:
(1) preparation precipitation strength martensitic stain less steel homogenization heat treatment state detection sample: by the detection sample into
Row corase grinding, fine grinding, polishing, cleaning (with water or alcohol), drying；
(2) dendrite corrosive agent of the preparation for precipitation strength martensitic stain less steel homogenization heat treatment state: according to above-mentioned branch
The component proportion of brilliant corrosive liquid, sequentially adds Sodium Metabisulfite into container, water, hydrochloric acid, and nitric acid stirs evenly；
(3) dendrite Corrosion monitoring: will test sample polishing and immerse in corrosive liquid up, stand 30s, dendrite out to be shown
It after tissue, takes out and is first rinsed well in flowing water, use alcohol rinse, drying, the amplification factor with metallographic microscope at 50 times afterwards
It is lower directly to observe.
Fig. 4 is the light microscopic figure after the corrosion of the present embodiment precipitation strength martensitic stain less steel, by Fig. 4 it is evident that precipitating is strong
Change the dendrite tissue of martensitic stain less steel homogenization heat treatment state, and can measure secondary dendrite spacing.
As seen from the above embodiment, it quick, simplicity can will be precipitated using dendrite corrosive liquid of the invention and caustic solution
The as cast condition or homogenization heat treatment state for strengthening martensitic stain less steel corrode out clearly arborescent structure, and corrosive effect is good, can be direct
Observe arborescent structure, measurement interdendritic away from.
It will appear blue light on the above-mentioned resulting light microscopic figure arborescent structure of caustic solution, branch can directly be observed by light microscopic figure
Crystalline substance tissue, measurement interdendritic is away from but measuring the degree of segregation that interdendritic and dendrite are done by power spectrum, for evaluating precipitation strength
It is blue when as-cast structure quality and auxiliary evaluation the homogenization heat treatment of martensitic stain less steel act on the elimination of dendritic segregation
Light will cause interference.
To solve above-mentioned Blue-light filtering, dendrite Corrosion monitoring process of the invention are as follows: will test sample burnishing surface and immerse corruption
Lose liquid in, stand 30~180s after, taking-up rinsed well in flowing water, after gently polished on polishing disk, then use water and wine
Fine is washed, drying, is directly observed under metallographic microscope.
Embodiment 3-1
The present embodiment is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, constituent and proportion are as follows: partially
Sodium bisulfite 2g, the pure 6ml of salt acid analysis, nitric acid analyze pure 2ml, water 75ml；The mass fraction of hydrochloric acid is 36~38%, nitric acid
Mass fraction be 65~68%.
Precipitation strength martensitic stain less steel is 15-5PH steel in this example.
Application method of the present embodiment for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, including following step
It is rapid:
(1) it prepares the detection sample of precipitation strength martensitic stain less steel as cast condition: the detection sample is roughly ground, carefully
Mill, polishing, cleaning (with water or alcohol), drying；
(2) preparation is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition: according to above-mentioned dendrite corrosive liquid
Component proportion sequentially adds Sodium Metabisulfite, water, hydrochloric acid, nitric acid into container, stirs evenly；
(3) dendrite Corrosion monitoring: will test sample burnishing surface and immerse in corrosive liquid, stand 180s, and taking-up is rushed in flowing water
Wash clean, after gently polished on polishing disk, then use water and alcohol rinse, drying, the amplification with metallographic microscope at 50 times
It is directly observed under multiple.
Fig. 5 is the light microscopic figure after the corrosion of the present embodiment precipitation strength martensitic stain less steel, and no blue light can obviously be seen by Fig. 5
The dendrite tissue of precipitation strength martensitic stain less steel as cast condition out, and can measure secondary dendrite spacing.
Sample is observed under 25 times of amplification factor with scanning electron microscope, precipitation strength martensitic stain less steel as cast condition branch can be obtained
Brilliant tissue local Fig. 6 can survey secondary dendrite spacing by Fig. 6, and can measuring stick crystalline substance it is dry with interdendritic degree of segregation.
Embodiment 3-2
The present embodiment is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, constituent and proportion are as follows: partially
Sodium bisulfite 2.8g, the pure 6ml of salt acid analysis, nitric acid analyze pure 4ml, water 75ml；The mass fraction of hydrochloric acid is 36~38%, nitre
The mass fraction of acid is 65~68%.
Precipitation strength martensitic stain less steel is 15-5PH steel in this example.
Application method of the present embodiment for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition, including following step
It is rapid:
(1) it prepares the detection sample of precipitation strength martensitic stain less steel as cast condition: the detection sample is roughly ground, carefully
Mill, polishing, cleaning (with water or alcohol), drying；
(2) preparation is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel as cast condition: according to above-mentioned dendrite corrosive liquid
Component proportion sequentially adds Sodium Metabisulfite, water, hydrochloric acid, nitric acid into container, stirs evenly；
(3) dendrite Corrosion monitoring: it will test sample burnishing surface and immerse in corrosive liquid, stand 40s, take out and first rushed in flowing water
Wash clean, after on polishing disk gently polish after use water and alcohol rinse, drying, the amplification factor with metallographic microscope at 50 times
It is lower directly to observe.
Fig. 7 is the light microscopic figure after the corrosion of the present embodiment precipitation strength martensitic stain less steel, and no blue light can obviously be seen by Fig. 7
The dendrite tissue of precipitation strength martensitic stain less steel as cast condition out, and can measure secondary dendrite spacing, it can be passed through by power spectrum
The degree of segregation that power spectrum measures interdendritic and dendrite is done.
The present invention for precipitation strength martensitic stain less steel dendrite corrosive liquid and its application method can it is easy, quickly,
Clearly corrode precipitation strength martensitic stain less steel as cast condition out and homogenizes the arborescent structure of heat treatment state.
It is easy to operate without processes such as heating；Longest only needs three minutes i.e. corrodible arborescent structure, used times out short；Corrosion
Arborescent structure out is clear, can be effectively by directly observing arborescent structure, and measurement interdendritic is away from and by power spectrum measuring branch
The degree of segregation that intergranular and dendrite are done, as-cast structure quality and auxiliary for evaluating precipitation strength martensitic stain less steel are commented
The heat treatment of valence homogenization acts on the elimination of dendritic segregation.To the sample progress corruption after the heat treatment of the homogenization of different process
Erosion, also can directly observe the elimination situation of dendrite, measure and evaluate dendrite by power spectrum and do and interdendritic element segregation eradicating efficacy.
The as-cast structure quality that can be used in evaluating precipitation strength martensitic stain less steel and auxiliary evaluation homogenization heat treatment are for branch
The elimination effect of crystalline substance segregation etc..
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of dendrite corrosive liquid of precipitation strength martensitic stain less steel, which is characterized in that including Sodium Metabisulfite, hydrochloric acid,
Nitric acid and distilled water.
2. a kind of dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 1, which is characterized in that specific
Proportion are as follows: 2~4g of Sodium Metabisulfite, 5~8ml of hydrochloric acid, 2~4ml of nitric acid, distilled water 75ml.
3. a kind of dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 2, which is characterized in that described
The mass fraction of hydrochloric acid is 36~38%, and the mass fraction of the nitric acid is 65~68%.
4. a kind of dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 1, which is characterized in that precipitating
Strengthen the ingredient percent range of martensitic stain less steel are as follows: C≤0.07, Mn≤1.00, Si≤1.00, Cr:14~17.5,
Ni:3~5.5, Cu:2.5~5, Nb+Ta:0~0.45 and Nb+Ta>=5C, S<0.03, P<0.04, Fe are surplus.
5. a kind of preparation side of the dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 1-4
Method, which is characterized in that take 2~4g of Sodium Metabisulfite, 5~8ml of hydrochloric acid, 2~4ml of nitric acid, distilled water 75ml, into container according to
Secondary addition Sodium Metabisulfite, distilled water, hydrochloric acid, nitric acid, and stir evenly.
6. a kind of user of the dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 1-4
Method, which comprises the following steps:
(1) prepare precipitation strength martensitic stain less steel detection sample: the detection sample is roughly ground, fine grinding, polishing, clearly
It washes and dries up；
(2) preparation is used for the dendrite corrosive liquid of precipitation strength martensitic stain less steel；
(3) dendrite Corrosion monitoring: the polishing of the detection sample is face-up, it immerses in the dendrite corrosive liquid, stands, to aobvious
After arborescent structure is shown, detection observation is carried out to the burnishing surface.
7. a kind of application method of the dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 6, special
Sign is, in step (3), the time of the standing is that 5~30s is first rinsed well in flowing water, so after detection sample takes out
Alcohol rinse is used afterwards, and drying carries out detection observation.
8. a kind of application method of the dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 6, special
Sign is, in step (3), the time of the standing is 30~180s, takes out detection sample, first rinses well in flowing water, after
Water and alcohol rinse are used after gently polishing on polishing disk, drying carries out detection observation.
9. a kind of application method of the dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 6, special
Sign is that detection observation described in step (3) is directly observed under 50 times of amplification factor using metallographic microscope.
10. a kind of application method of the dendrite corrosive liquid of precipitation strength martensitic stain less steel according to claim 6-8,
It is characterized in that, detection observation described in step (3) is directly observed under 25~50 times of amplification factor using scanning electron microscope.
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| CN201811068584.0A CN109295456B (en) | 2018-09-13 | 2018-09-13 | Dendritic crystal corrosive liquid for precipitation strengthening of martensitic stainless steel and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983339A (en) * | 2019-12-05 | 2020-04-10 | 南京工业大学 | Double-phase stainless steel metallographic corrosive liquid formula and use method thereof |
| CN111638113A (en) * | 2020-06-10 | 2020-09-08 | 天津重型装备工程研究有限公司 | Precipitation strengthening martensitic stainless steel prior austenite grain boundary corrosion method |
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| CN111638113B (en) * | 2020-06-10 | 2023-07-11 | 天津重型装备工程研究有限公司 | Precipitation strengthening martensite stainless steel prior austenite grain boundary corrosion method |
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