CN1277273C - Surface treating method for atomic reactor component and atomic reactor component producing method thereby - Google Patents
Surface treating method for atomic reactor component and atomic reactor component producing method thereby Download PDFInfo
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- CN1277273C CN1277273C CNB031407137A CN03140713A CN1277273C CN 1277273 C CN1277273 C CN 1277273C CN B031407137 A CNB031407137 A CN B031407137A CN 03140713 A CN03140713 A CN 03140713A CN 1277273 C CN1277273 C CN 1277273C
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Abstract
The present invention provides a surface treatment method for an atomic reactor component, which is used for effectively removing a surface layer which is considered as the cause of generating stress corrosion cracking (SCC) under the condition of low stress, namely a lacking chrome layer and a work hardening layer. The surface treatment method for an atomic reactor component comprises that the atomic reactor component is bent (procedure 1), and heat treatment is carried out (procedure 2); the work hardening layer is formed by bending the atomic reactor component, and simultaneously, the lacking chrome layer is formed by an oxidation film attached to the atomic reactor component in the process of the heat treatment. In order to remove the work hardening layer and the lacking chrome layer from the atomic reactor component, the arbitrary method (procedure 3) of acid washing, milling, electrolytic milling, electrical discharge processing, surface cut, surface deoxidation, surface softening, wet shot blast and laser processing is used.
Description
Technical field
The fuel aggregate that the water type atomic reactor that the present invention relates to pressurize is used particularly relates to the surface treatment method of the leaf spring (leaf spring) of upper nozzle.
Background technology
Fig. 4 is the sketch of the general fuel aggregate that uses in the pressurization water type atomic reactor, and Fig. 5 is the sketch of leaf spring.In Fig. 4, fuel aggregate 1 is by constituting with the lower part: the upper nozzle 2 of configured separate and lower nozzle 3 up and down; A plurality of grids 4 dispose with predetermined distance between said nozzle 2 and nozzle 3, and have the grid space that is formed by strap (strap); Control rod guide pipe 5 inserts perforation in the grid space of grid 4 with the configuration of regulation, and is fixed by the fixed part of grid 4, and its each upper and lower end parts is connected with lower nozzle 3 with upper nozzle 2 simultaneously; A plurality of fuel rods 6 are flexibly supported by the support sector of grid 4.Fuel aggregate 1 is in the stove heart (not shown), by the top stove core 7 and 8 maintenances of lower furnace core of structure in the stove body.
The leaf spring 9 that is located between upper nozzle 2 and the top stove core 7 is configured on the upper nozzle 2.This leaf spring 9 has such function, promptly absorbs fuel aggregate 1 owing to radiation is extended, thermal expansion difference between fuel aggregate 1 and the structure in the stove body, and prevents that the chilled water that flows into from the below from making fuel aggregate 1 come-up.
Generally, the number of permutations that fuel aggregate 1 can based on fuel rod 6 is divided into 17 * 17 types, 15 * 15 types, 14 * 14 types etc.Fig. 5 shows the structure of the leaf spring 9 of 17 * 17 types as an example.Leaf spring 9 is made of upper springs 10 and lower springs 11, and lower springs 11 is made of two sheet materials.
Fig. 5 (b) is that as can be seen from the figure, upper springs 10 has bend 12 and vertical portion 13 by the amplification details drawing of the A that dot-and-dash line the enclosed part of Fig. 5 (a), and vertical portion 13 is provided with stage portion 14.Be provided with through hole 15 on lower springs 11, when the vertical portion 13 with upper springs 10 inserted in the through hole 15, upper springs 10 contacted at stage portion 14 places with lower springs 11, and becomes the structure of one.
In addition, in order to be fixed on the upper nozzle 2, the base portion 16 of leaf spring 9 forms horizontal structure, promptly forms the structure parallel with the upper surface of upper nozzle 2, and is fixed on the upper nozzle 2 by erection bolt 17.On the other hand, leaf spring 9 is in order to produce snap-in force, and near its upper end (bend 12) forms the shape that contacts with top stove core 7.Therefore, leaf spring 9 is crooked upward with bigger angle near its base portion 16.In order to obtain essential elastic force, the material of leaf spring 9 uses the high precipitation hardening type nickel alloy (for example inconel (Inconel) 718) of endurance.
Generally, fuel aggregate 1 is immersed in atomic pile in coolant and uses, but leaf spring 9 can produce stress when using in atomic pile, and a coolant of high temperature may make leaf spring 9 produce stress corrosion cracking (SCC)s (SCC).In addition, should consider that also the surface state of the leaf spring material that contacts with coolant is subjected to the influence of stress corrosion cracking (SCC) (SCC).
Below utilize Fig. 6, leaf spring manufacturing process of the prior art is described.As mentioned above, because the base portion 16 of leaf spring 9 is fixed on the upper nozzle 2, thus must form horizontal structure, but in order to produce necessary snap-in force, its upper end forms the shape that contacts with top stove core 7.Therefore, carry out bending machining, make the crooked upward (step 1) of base portion 16 of leaf spring 9.Because this bending machining is carried out with bigger angle,, must carry out before in thermal treatment (step 2) so consider from the angle of processability.
But, have such problem, promptly because in advance line bend processing of thermal treatment, so can adhesion heat handle the oxide film that produces on the bending machining part, this oxide film can cause forming scarce chromium (Cr) layer.In order to remove this oxide film, usually milled processed is carried out on the surface, but owing to (carry out after the step 1), be difficult to grind, so all be that bending machining portion is not ground now with common grinding process in bending machining.Therefore, at bend except because bending machining and residual work hardening layer, also because this oxide film forms scarce chromium layer, so may reduce the anticorrosion stress-resistant crackle characteristic (anti-SCC characteristic) of leaf spring 9.
In addition, such method is adopted in the surface treatment of leaf spring 9 now, and promptly (step 3) is in order to guarantee the attractive in appearance of product after the final machining after heat-treating (step 2), remove oxide film by glass bead peening (GBB, glass bead blasting) processing.But the scarce chromium layer of removing the metal part by this glass bead peening (GBB) is very difficult, if carried out strong glass bead peening (GBB), then worries to produce new work hardening layer, and this is undesirable.
The problems referred to above are considered to be in the potential cause that produces stress corrosion cracking (SCC) (SCC) under the low-stress.That is, lack the chromium layer corrosion resistance on surface is worsened, and the surface working hardened layer is easy to generate incipient crack.
Therefore, the present invention proposes in order to solve above-mentioned prior art problems, and its fundamental purpose provides a kind of atomic pile parts surface disposal route that superficial layer promptly lacks chromium layer and work hardening layer of removing effectively.
Summary of the invention
To achieve these goals, technical scheme 1 of the present invention provides a kind of surface treatment method of atomic pile parts, above-mentioned atomic pile parts are being carried out heat-treating after the bending machining, owing to this bending machining forms work hardening layer, owing to forming, the oxide film that adheres to lacks the chromium layer simultaneously in this thermal treatment, it is characterized in that, in order to remove above-mentioned work hardening layer and above-mentioned scarce chromium layer, use pickling from above-mentioned atomic pile parts, grind, electrolytic polishing, electrodischarge machining, surfacing cut, surface deoxidation and softening, any one method in wet blasting and the Laser Processing.
In addition, technical scheme 2 of the present invention provides a kind of surface treatment method of atomic pile parts, above-mentioned atomic pile parts are being carried out heat-treating after the bending machining, owing to this bending machining forms work hardening layer, owing to forming, the oxide film that adheres to lacks the chromium layer simultaneously in this thermal treatment, it is characterized in that,, and carry out electroplating surface for contacting of the work hardening layer that prevents above-mentioned atomic pile parts and scarce chromium layer and a coolant.
Carry out surface treatment by above-mentioned method of surface finish, can remove the scarce chromium layer and the surface working hardened layer of atomic pile parts surface, perhaps can prevent to lack contacting of chromium layer and work hardening layer and a coolant.
Preferably carry out surface treatment, make that amount of grinding is in the scope of 1 μ m～100 μ m, surfaceness is the scope of 0.1a～0.4a.In addition, also preferably carry out surface treatment, make that amount of grinding is that 75 μ m, surfaceness are 0.2a.As using atomic pile parts of the present invention, preferably be located at the leaf spring on the pressurization water type atomic reactor usefulness upper nozzle of fuel aggregate.
According to a further aspect in the invention, the atomic pile member manufacturing method is made of following technology: (i) bending machining technology is bent to above-mentioned atomic pile parts the angle of regulation; (ii) Technology for Heating Processing is carried out hot-working to the above-mentioned atomic pile parts that are bent after the processing; (iii) process of surface treatment, be used for the scarce chromium layer removing the work hardening layer that produces owing to above-mentioned bending machining and form the oxide film that adheres in above-mentioned thermal treatment from above-mentioned atomic pile parts, the above-mentioned work hardening layer that perhaps is used to prevent above-mentioned atomic pile parts and scarce chromium layer contact with a coolant; And (iv) fine-processing technique, the above-mentioned atomic pile parts of finishing.
Carry out surface treatment by above-mentioned method of surface finish, can remove the scarce chromium layer and the surface working hardened layer of atomic pile parts surface, perhaps can prevent to lack contacting of chromium layer and work hardening layer and a coolant, thereby can form the atomic pile parts that are difficult to produce stress corrosion cracking (SCC).
Preferably from the atomic pile parts remove since the process of surface treatment of the scarce chromium layer that the oxide film that adheres to above-mentioned thermal treatment forms be pickling, grinding, electrolytic polishing, electrodischarge machining, surfacing cut, surperficial deoxidation and soften, in wet blasting and the Laser Processing any one.In addition, the work hardening layer that is preferred for preventing above-mentioned atomic pile parts and scarce chromium layer are electroplating surfaces with the process of surface treatment that contacts of a coolant.
Description of drawings
Fig. 1 is the figure of expression manufacturing process of the present invention.
Fig. 2 is the curve map of the results of elemental analyses of the leaf spring (bend) after the expression Ageing Treatment.
Fig. 3 is the curve map of the thickness of slab direction hardness measure of spread of the leaf spring (bend) after the expression Ageing Treatment.
Fig. 4 is the sketch of the general fuel aggregate that uses in the pressurization water type atomic reactor of expression.
Fig. 5 is the sketch of leaf spring.
Fig. 6 is the figure of the existing manufacturing process of expression.
Embodiment
Following with reference to accompanying drawing, preferred implementation of the present invention is described.Same label among the figure is represented same or counterpart.
As mentioned above, in existing technology since bending machining portion residual scarce chromium layer and work hardening layer, so, must remove this scarce chromium layer and work hardening layer effectively in order to improve anticorrosion stress-resistant crackle characteristic (anti-SCC characteristic).In the present invention, in order to obtain enough effects, and processing cost is not produced harmful effect, be used to remove the grinding condition that lacks chromium layer and work hardening layer below the consideration.
(lacking the chromium layer)
At first, for scarce chromium layer, carry out the chromium concn after the Ageing Treatment of leaf spring, the ultimate analysis of oxygen concentration.Its result as shown in Figure 2.In 0.2 mu m range on surface, produce the oxide chrome green.Because the existence of this oxide, chromium concn can be observed, oxygen concentration all uprises.Begin from this oxide that darker chromium concn sharply descends to the part of inside, along with the distance with the surface increases, chromium concn is replied gradually then, but chromium concn is compared with mother metal or be low.The scope that this chromium concn reduces is the scope that begins about 1 μ m from the surface.
(bending machining hardened layer)
Below the bending machining hardened layer is described, with respect to the thickness of slab direction in the leaf spring cross section after the bending machining, carry out hardness test with the Vickers micro Vickers hardness meter.Its result as shown in Figure 3.From this result as can be seen, because the leaf spring bending, hardness increases in the scope of 50 μ m.
From the result of above two kinds of tests as can be seen, work hardening layer is considered from this point than scarce chromium bed thickness, can be determined grinding condition.Therefore, for attrition process hardened layer positively, amount of grinding should be more than the 50 μ m.But according to the degree of bending machining, work hardening layer may so reduce the district in order to comprise above-mentioned chromium concn, should carry out the above grinding of minimum 1 μ m less than 50 μ m.
On the other hand, when amount of grinding was big, because the hardness height of the material after the thermal treatment, so milling time is elongated, cost increased.Therefore, consider that from the angle of cost amount of grinding is the smaller the better.Therefore, amount of grinding preferably is controlled at below the 100 μ m.
By above research, the optimum value and the scope of the surfaceness after amount of grinding and the grinding are as described below.
(optimum value) (scope)
Amount of grinding: 75 μ m, 1 μ m～100 μ m
Surfaceness: 0.2a 0.1a～0.4a
The present inventor has verified that the leaf spring that carries out the grinding in the above-mentioned scope compares with existing leaf spring, and its anticorrosion stress-resistant crackle characteristic (anti-SCC characteristic) improves.
In the present invention, before fine-processing technique, comprise the surface treatment of above-mentioned grinding, can prevent the generation of leaf spring stress corrosion cracking (SCC) (SCC) thus.Fig. 1 shows and uses leaf spring manufacturing process of the present invention.As can be seen from this figure, be, (between the step 4), comprise the grinding technics (process of surface treatment of step 3) in Technology for Heating Processing (step 2) and fine-processing technique with the difference of existing manufacturing process (with reference to Fig. 6).Now various surface treatment mode is listed below, this each mode wherein can be used the grinding condition when working to adapt to above-mentioned leaf spring effectively as the process of surface treatment after the leaf spring thermal treatment.
[the scarce chromium layer on leaf spring surface and the removal of work hardening layer]
(1) pickling
With the surface film after the removal Ageing Treatment such as nitric acid, i.e. the surface portion that comprises the high stress portion that is easy to generate stress corrosion cracking (SCC) (SCC) on the leaf spring is removed in dissolving.For this reason, control acid concentration, time, temperature etc. are with the control etching extent.
(2) grind
Grind to remove surface film after the Ageing Treatment with machine tool or manual operations, promptly measure the geomery after the thermal treatment, obtain the processing capacity of each working position, grind then.Perhaps, change the shape and the tool using of emery wheel, grind then according to working position.
(3) electrolytic polishing
Remove surface film after the Ageing Treatment by electrolytic corrosion, promptly with the corresponding electrolytic polishing liquid of metal in, object as anode, is passed to DC current, thereby makes the surface dissolution of object.
(4) electrodischarge machining
By the surface film after the electrodischarge machining removal Ageing Treatment, promptly the shape corresponding electrode of making and leaf spring is removed and electrode superficial layer in opposite directions by arc discharge.
(5) surfacing cut
The leaf spring made from heavy-gauge sheeting by line cutting (wire cutting) cutting makes its whole surperficial attenuation, thereby removes superficial layer to given size.
(6) surperficial deoxidation and softening (deoxidation and softening)
Not to lack the chromium layer from surface removal, but can not reach under the heat treated cryogenic conditions, make to be nitrogen atmosphere (reducing atmosphere) in the stove, and leaf spring is heated with mechanical means.Thus, only the surface becomes annealed condition and is softened, thereby has improved ductility, and the surface working hardened layer is disappeared.In addition, because the chromium-containing oxide on leaf spring surface is reduced,, lack the disappearance of chromium layer thereby make so chromium is returned in the metal mother metal.
(7) wet blasting (wet blasting)
Not dry type glass bead peening (GBB), but be the wet blasting removal superficial layer of feature by compound action with water+abrasive substance+air (pressurized air).
(8) Laser Processing
By laser radiation, remove the interior superficial layer of processing specified scope of leaf spring.
[the scarce chromium layer that prevents the leaf spring surface and work hardening layer contact with a coolant]
(9) electroplating surface
Leaf spring is electroplated, prevented that the scarce chromium layer on surface from contacting with a coolant.
By after thermal treatment, carrying out above-mentioned 9 kinds of method of surface finish, can remove the scarce chromium layer and the work hardening layer on in-problem leaf spring surface in the prior art, perhaps can prevent to lack contacting of chromium layer and work hardening layer and a coolant.
Carry out surface treatment by method of surface finish of the present invention, can remove because the scarce chromium layer and the surface working hardened layer on the leaf spring surface that thermal treatment produces, perhaps prevent to lack contacting of chromium layer and work hardening layer and a coolant, thereby prevent to produce stress corrosion cracking (SCC) (SCC).
Claims (11)
1. the surface treatment method of atomic pile parts, above-mentioned atomic pile parts are being carried out heat-treating after the bending machining, thereby, owing to forming, the oxide film that adheres to lacks the chromium layer simultaneously in this thermal treatment owing to this bending machining forms work hardening layer
In order to remove above-mentioned work hardening layer and above-mentioned scarce chromium layer, use any one method in pickling, grinding, electrolytic polishing, electrodischarge machining, surfacing cut, surperficial deoxidation and softening, wet blasting and the Laser Processing from above-mentioned atomic pile parts.
2. surface treatment method according to claim 1 carries out surface treatment, makes that amount of grinding is that scope, the surfaceness of 1 μ m～100 μ m is the scope of 0.1a～0.4a.
3. surface treatment method according to claim 2 carries out surface treatment, makes that amount of grinding is that 75 μ m, surfaceness are 0.2a.
4. according to any described surface treatment method of claim 1 to 3, above-mentioned atomic pile parts are provided in a side of the leaf spring on the pressurization water type atomic reactor usefulness upper nozzle of fuel aggregate.
5. the surface treatment method of atomic pile parts, above-mentioned atomic pile parts are being carried out heat-treating after the bending machining, thereby, owing to forming, the oxide film that adheres to lacks the chromium layer simultaneously in this thermal treatment owing to this bending machining forms work hardening layer
For contacting of the work hardening layer that prevents above-mentioned atomic pile parts and scarce chromium layer and a coolant, and carry out electroplating surface.
6. surface treatment method according to claim 5 carries out surface treatment, makes that amount of grinding is that scope, the surfaceness of 1 μ m～100 μ m is the scope of 0.1a～0.4a.
7. surface treatment method according to claim 6 carries out surface treatment, makes that amount of grinding is that 75 μ m, surfaceness are 0.2a.
8. according to any described surface treatment method of claim 5 to 7, above-mentioned atomic pile parts are provided in a side of the leaf spring on the pressurization water type atomic reactor usefulness upper nozzle of fuel aggregate.
9. atomic pile member manufacturing method is made of following technology:
Bending machining technology is bent to above-mentioned atomic pile parts the angle of regulation;
Technology for Heating Processing is heat-treated the above-mentioned atomic pile parts that are bent after the processing;
Process of surface treatment, be used for the scarce chromium layer removing the work hardening layer that produces owing to above-mentioned bending machining and form owing to the oxide film that adheres in above-mentioned thermal treatment from above-mentioned atomic pile parts, the above-mentioned work hardening layer that perhaps is used to prevent above-mentioned atomic pile parts and scarce chromium layer contact with a coolant; And
Fine-processing technique, the above-mentioned atomic pile parts of finishing.
10. manufacture method according to claim 9, from the atomic pile parts remove since the process of surface treatment of the scarce chromium layer that the oxide film that adheres to above-mentioned thermal treatment forms be pickling, grinding, electrolytic polishing, electrodischarge machining, surfacing cut, surperficial deoxidation and soften, in wet blasting and the Laser Processing any one.
11. manufacture method according to claim 9, the work hardening layer that is used to prevent above-mentioned atomic pile parts and scarce chromium layer are electroplating surfaces with the process of surface treatment that contacts of a coolant.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031407137A CN1277273C (en) | 2003-05-30 | 2003-05-30 | Surface treating method for atomic reactor component and atomic reactor component producing method thereby |
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| CNB031407137A CN1277273C (en) | 2003-05-30 | 2003-05-30 | Surface treating method for atomic reactor component and atomic reactor component producing method thereby |
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| CN1553457A CN1553457A (en) | 2004-12-08 |
| CN1277273C true CN1277273C (en) | 2006-09-27 |
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| JP5606824B2 (en) * | 2010-08-18 | 2014-10-15 | 株式会社不二製作所 | Mold surface treatment method and mold surface-treated by the above method |
| EP2719800B1 (en) * | 2011-06-09 | 2018-03-21 | Tokyo Stainless Grinding Co., Ltd. | Method for producing steel |
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Granted publication date: 20060927 Termination date: 20160530 |