CN109550907A - A method of solving the enrichment of zircaloy casting head ferro element - Google Patents
A method of solving the enrichment of zircaloy casting head ferro element Download PDFInfo
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- CN109550907A CN109550907A CN201811529909.0A CN201811529909A CN109550907A CN 109550907 A CN109550907 A CN 109550907A CN 201811529909 A CN201811529909 A CN 201811529909A CN 109550907 A CN109550907 A CN 109550907A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/20—Arc remelting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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Abstract
The invention discloses it is a kind of solution zircaloy casting head ferro element enrichment method, this method comprises: one, according to target zirconium alloy cast ingot select raw material；Two, by nuclear grade zirconium grain and its component raw material, simultaneously melting obtains intermediate alloy A and intermediate alloy B to ingredient in batches；The mass content of iron lower than intermediate alloy B 4%~10% in intermediate alloy A；Three, sponge zirconium in nuclear leve is prepared into consutrode A and consutrode B with intermediate alloy A and intermediate alloy B respectively；Four, consutrode A and consutrode B welding is combined into consutrode and using consutrode A as head, it is smelting to obtain zircaloy ingot casting.The present invention passes through the intermediate alloy for preparing different Fe contents, and the intermediate alloy of low Fe content is prepared into consutrode and is used for the head melting of target zirconium alloy cast ingot, zircaloy ingot casting is obtained through vacuum melting, improve the head ferro element segregation phenomena of zircaloy ingot casting, the excision for avoiding zircaloy casting head, improves yield rate.
Description
Technical field
The invention belongs to zircaloy ingot casting preparation technical fields, and in particular to a kind of solution zircaloy casting head ferro element
The method of enrichment.
Background technique
Reactor fuel element cladding zircaloy is one of key core material of power producer, nuclear advance,
Security reliability and economy and the performance of cladding materials used are closely related.In past more than 30 years, PWR Fuel member
Service performance is satisfactory in the heap of part involucrum Zr-4 alloy.With power producer technology towards improve fuel burn-up
Develop with the direction of reduction fuel cycle cost, the raising reactor thermal efficiency, raising security reliability, key core component is fired
More stringent requirements are proposed for the performance of material cladding material zircaloy, including corrosive nature, hydrogen sucking function, mechanical property and spoke
According to dimensional stability etc..Currently, the fuel canning material of commercial nuclear power plant is essentially Zr-Sn-Fe and Zr-Nb system alloy,
In it is in the majority with Zr-Sn-Fe system.All in the exploitation higher new zirconium alloy of burnup, the overwhelming majority was first using iron is improved for each state in recent years
Mass percentage of the element in zircaloy has obtained a series of outstanding zirconium alloy products, such as: Zirlo, Russia sieve in the U.S.
N18 the and N36 alloy of this E635, the NDA of Japan and China.The method system that zircaloy ingot casting generallys use vacuum melting
It is standby, it needs that raw material sponge zirconium and corresponding alloy are first pressed into electrode together before melting, the alloy in zircaloy ingot casting
Ingredient is mainly regulated and controled by the addition of intermediate alloy.And mass content of the ferro element in zircaloy is improved, make as involucrum
The head ferro element that zircaloy ingot casting occurs after vacuum melting in the raw material zircaloy ingot casting of pipe processing is segregated more serious
Phenomenon, especially higher alloy of Fe content itself, casting head iron content even have exceeded standard requirements.As zircaloy is cast
Ingot specification is increasing, and the control of zircaloy casting head iron content is more difficult, many times not for fidelity product quality
The resection for not increasing casting head is obtained, to reduce ingot casting yield rate.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of solution zirconium conjunction
The method of golden casting head ferro element enrichment.This method passes through the intermediate alloy for preparing different Fe contents, is then prepared into consumable
Electrode, and the intermediate alloy of low Fe content is prepared into the part that the head melting of target zirconium alloy cast ingot is used in consutrode,
Zircaloy ingot casting is obtained through vacuum melting again, the head ferro element segregation phenomena of zircaloy ingot casting is improved, avoids zircaloy
The excision of casting head, improve the yield rate of zircaloy ingot casting, the further expansion preparation specification of zircaloy ingot casting.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of solution zircaloy casting head iron member
The method of element enrichment, which is characterized in that method includes the following steps:
Step 1: stock: selecting corrresponding quality according to the ingredient of each component in target product zircaloy ingot casting and content
Nuclear grade zirconium grain, sponge zirconium in nuclear leve and other component raw materials are stocked up, and other component raw materials include iron；
Step 2: the preparation of intermediate alloy: by the nuclear grade zirconium grain in step 1 and other groups in addition to sponge zirconium in nuclear leve
Point raw material ingredient and carries out melting in batches, obtains two batches intermediate alloy: intermediate alloy A and intermediate alloy B；The intermediate alloy A
Mass ratio with intermediate alloy B is 1:9, and the mass content of iron is lower than the mass content of iron in intermediate alloy B in intermediate alloy A
4%~10%, the intermediate alloy A is identical as the constituent content in intermediate alloy B in addition to zirconium and iron；
Step 3: electrode prepare: by sponge zirconium in nuclear leve respectively with intermediate alloy A obtained in step 2 and intermediate alloy B
It is pressed into electrode and group is welded into consutrode A and consutrode B；Electricity is pressed into for intermediate alloy A in the sponge zirconium in nuclear leve
The mass ratio of the sponge zirconium in nuclear leve of pole and the sponge zirconium in nuclear leve that electrode is pressed into for intermediate alloy B is 1:9；
Step 4: prepared by zircaloy ingot casting: consutrode A obtained in step 3 and consutrode B are carried out welding group
It is made into consutrode and the head using consutrode A as consutrode, is subsequently placed in vacuum consumable electrode arc furnace and carries out three
Secondary melting obtains zircaloy ingot casting.
The process of setting of alloying element in zircaloy ingot casting is all completed in certain temperature range, and different moments are precipitated not
Congruent solid causes solute redistributing and forming segregation in process of setting because the diffusion of portly substance is very slow.Segregation
Distribution constant K in solid liquid phase of size and solute0It is related, and shadow of this distribution constant directly by mass sets speed
It rings, and changes with temperature difference.Distribution constant K0Solute concentration ratio, i.e. K in solid-liquid two-phase when referring to balance0(solute exists=Cs
Concentration in solid phase)/Cl (concentration of solute in the liquid phase), works as K0When < 1, i.e., alloying element is greater than in the concentration of liquid phase solid
The concentration of phase, and show that the K value of Fe is 0.3 according to open source information.In order to move up shrinkage cavity in zircaloy ingot casting cooling procedure, subtract
Few zircaloy casting head resection is to improve yield rate, in the heat-sealing top stage in zircaloy ingot casting melting later period using lesser
Melting electric current extends the liquid metal retention time, this just exacerbates migration of the Fe to liquid metal, makes zircaloy to reduce molten speed
Casting head Fe constituent content increases, or even exceeds critical field.Therefore the present invention passes through the centre for first preparing different Fe contents
Then alloy is prepared into consutrode, be used for target zirconium conjunction wherein the intermediate alloy of low Fe content is prepared into consutrode
The part of golden casting head melting, then zircaloy ingot casting is obtained through vacuum melting, Fe is reduced from source in zircaloy ingot casting
The mass content on head substantially improves the head ferro element segregation phenomena of zircaloy ingot casting, avoids zircaloy casting head
Excision, improve the yield rate of zircaloy ingot casting, the further expansion preparation specification of zircaloy ingot casting.
The method of above-mentioned a kind of solution zircaloy casting head ferro element enrichment, which is characterized in that described in step 2
The mass content of iron lower than the mass content of iron in intermediate alloy B 4% in intermediate alloy A.When the quality of iron in intermediate alloy A contains
When amount is less than the mass content and the two difference of iron in intermediate alloy B less than 4%, the iron for the zircaloy casting head being prepared
Element still excessively high can exceed critical field, and the ferro element of zircaloy casting head is caused to be enriched with.
The method of above-mentioned a kind of solution zircaloy casting head ferro element enrichment, which is characterized in that described in step 2
The mass content of iron lower than the mass content of iron in intermediate alloy B 7% in intermediate alloy A.When the quality of iron in intermediate alloy A contains
Amount be less than intermediate alloy B in iron mass content and the two difference be 7% when, the zircaloy casting head being prepared iron member
Element is not in segregation phenomena in critical field, and zircaloy ingot casting yield rate is higher.
The method of above-mentioned a kind of solution zircaloy casting head ferro element enrichment, which is characterized in that described in step 2
The mass content of iron lower than the mass content of iron in intermediate alloy B 10% in intermediate alloy A.When the quality of iron in intermediate alloy A
When the mass content and the two difference that content is less than iron in intermediate alloy B are greater than 10%, iron in entire zircaloy ingot casting will affect
The distributing homogeneity of element.
The method of above-mentioned a kind of solution zircaloy casting head ferro element enrichment, which is characterized in that described in step 2
Melting uses the melting of vacuum non-consumable, and the vacuum degree of the vacuum non-consumable melting is less than 0.5Pa, and Pressure Rise Rate is not more than before melting
The quality of 0.2Pa/min, each intermediate alloy A and intermediate alloy B are not more than 40g.By limiting, melting preparation is intermediate to be closed
The technological parameter of gold and the quality of each intermediate alloy A and intermediate alloy B, keep the alloying of intermediate alloy more abundant, thus
Improve the uniformity of each component in zircaloy ingot casting.
The method of above-mentioned a kind of solution zircaloy casting head ferro element enrichment, which is characterized in that described in step 4
Three times in fusion process, tack is machined out to ingot casting after each melting, three times the secondary smelting in fusion process and three
It is respectively required for reversing end for end on an ingot and secondary ingot when the shove charge of secondary melting.Tack is machined out to remove to ingot casting after each melting
Auxiliary process size improves the precision of ingot casting surface；Secondary smelting in fusion process and three times the shove charge time-division of melting three times
An ingot and secondary ingot are not reversed end for end, the influence that smelting technology is enriched with zircaloy casting head ferro element is reduced, further mentions
The distributing homogeneity of ferro element in high entire zircaloy ingot casting.
Compared with the prior art, the present invention has the following advantages:
1, the present invention passes through the intermediate alloy for preparing different Fe contents, consutrode is then prepared into, wherein low Fe is contained
The intermediate alloy of amount is prepared into the part that the head melting of target zirconium alloy cast ingot is used in consutrode, then obtains through vacuum melting
Zircaloy ingot casting substantially improves the head ferro element segregation phenomena of zircaloy ingot casting, avoids cutting for zircaloy casting head
It removes, improves the yield rate of zircaloy ingot casting, the further expansion preparation specification of zircaloy ingot casting.
2, the present invention prepares the intermediate alloy of different Fe contents from ingredient, in conjunction with reasonable allotment melting sequence, subtracts
The adverse effect for having lacked head ferro element segregation of the smelting technology to zircaloy ingot casting, further improves zircaloy casting head
The segregation of ferro element improves homogeneity of ingredients in zircaloy ingot casting.
It 3, using uniform ingredient is in the prior art to prepare that each component content identical consutrode is smelting again to be obtained
The mass content of the Fe of zircaloy casting head is usually higher by 14% than other positions, and the zircaloy casting that the present invention is prepared
The mass content of the Fe in head of ingot portion is higher by value within 10% than other positions, alleviates the enrichment of zircaloy casting head ferro element
Phenomenon.
4, the present invention, by the rational design and calculating of early period, is only matching on the basis of the preparation of original zircaloy ingot casting
It is modified effective control that the segregation to zircaloy casting head ferro element can be realized during material, simple process is feasible
Property it is high, it is easy to promote large-scale.
5, the present invention is not only that zircaloy casting head Fe element segregation provides solution, can also be for other elements such as
The identical Sn with Fe element segregation rule, the ingredient in ingot casting such as Volatile Elements Cr is more difficult to control but has the member of certain rule
Element content in ingot casting accurately controls offer reference.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of consutrode of the present invention.
Fig. 2 is the shove charge schematic diagram of consutrode of the present invention three times in fusion process, an ingot and secondary ingot.
Fig. 3 is the sampling schematic diagram on zircaloy ingot casting of the present invention upper surface.
Fig. 4 is the sampling schematic diagram on zircaloy ingot casting side wall of the present invention.
Specific embodiment
Embodiment 1
The present embodiment the following steps are included:
Step 1: stock: selecting 2.2kg zirconium according to the ingredient of each component in target product Zr-4 zircaloy ingot casting and content
Grain, 980.7kg sponge zirconium in nuclear leve, 13.5kg the Cr of Fe and 1.3kg of Sn, 2.2839kg stock up；
Step 2: the preparation of intermediate alloy: by the Fe of 0.2139kg, the Cr and 0.2346kg of the Sn of 1.35kg, 0.13kg
Nuclear grade zirconium grain carries out ingredient and simultaneously obtains 1.928kg intermediate alloy A through secondary smelting, by the Fe of 2.07kg, the Sn of 12.15kg,
Cr the and 1.967kg nuclear grade zirconium grain of 1.17kg carries out ingredient and obtains 17.357kg intermediate alloy B through secondary smelting；The melting
It is all made of vacuum non-consumable melting, the vacuum degree of the vacuum non-consumable melting is 0.4Pa, and Pressure Rise Rate is 0.18Pa/ before melting
min；The mass content of Fe is 0.2139% in the intermediate alloy A, and the number of intermediate alloy A is 48；The intermediate alloy B
The mass content of middle Fe is 0.23%, and the number of intermediate alloy B is 434；
Step 3: prepared by electrode: by intermediate alloy A obtained in 98.1kg sponge zirconium in nuclear leve and step 2 in 50MN electrode
It is pressed into electrode on press and group is welded into consutrode A, by intermediate alloy B obtained in 882.6kg intermediate alloy B and step 2
It is pressed into electrode on 50MN electrode press and group is welded into consutrode B；
Step 4: prepared by zircaloy ingot casting: consutrode A obtained in step 3 and consutrode B are carried out welding group
It is made into consutrode and uses consutrode A as the head of consutrode and be identified (as shown in Figure 1), be subsequently placed in true
Melting three times is carried out in empty consumable electroarc furnace, obtains zircaloy ingot casting；As shown in Fig. 2, the detailed process of the melting three times are as follows:
It in melting voltage is 31~33V that consutrode head with auxiliary electrode welding is placed on diameter upwards, which is in the crucible of 280mm,
Melting electric current is 9kA, and melting initial vacuum degree carries out melting once under conditions of being 0.125Pa and obtains an ingot, then will be primary
Ingot u-turn is placed in the crucible that diameter is 360mm, is 32~34V in melting voltage, melting electric current is 11kA, melting initial vacuum
Degree carries out secondary smelting and obtains secondary ingot under conditions of being 0.138Pa, then the u-turn of secondary ingot is placed on the earthenware that diameter is 450mm
It is 33~35V in melting voltage, melting electric current is 13kA, and melting initial vacuum degree carries out three times under conditions of being 0.09Pa in crucible
Melting obtains ingot three times.
Comparative example 1
This comparative example the following steps are included:
Step 1: stock: selecting 2.2kg zirconium according to the ingredient of each component in target product Zr-4 zircaloy ingot casting and content
Grain, 980.7kg sponge zirconium in nuclear leve, 13.5kg the Cr of Fe and 1.3kg of Sn, 2.3kg stock up；
Step 2: the preparation of intermediate alloy: raw material each in step 1 being carried out ingredient and obtains 1.93kg through secondary smelting
Intermediate alloy；The melting is all made of vacuum non-consumable melting, and the vacuum degree of the vacuum non-consumable melting is 0.4Pa, melting
Preceding Pressure Rise Rate is 0.18Pa/min；The mass content of Fe is 0.23% in the intermediate alloy A, and the number of intermediate alloy A is 482
It is a；
Step 3: prepared by electrode: by intermediate alloy obtained in 980.7kg sponge zirconium in nuclear leve and step 2 in 50MN electrode
It is pressed into electrode on press and group is welded into consutrode；
Step 4: zircaloy ingot casting prepare: by consutrode obtained in step 3 be placed in vacuum consumable electrode arc furnace into
Row melting three times, obtains zircaloy ingot casting；The detailed process of the melting three times are as follows: it is 280mm that consutrode, which is placed in diameter,
Crucible in melting voltage be 31~33V, melting electric current be 9kA, melting initial vacuum degree be 0.125Pa under conditions of carry out one
Secondary melting obtains an ingot, is then placed on the u-turn of ingot in the crucible that diameter is 360mm, melting voltage be 32~
34V, melting electric current are 11kA, and melting initial vacuum degree carries out secondary smelting under conditions of being 0.138Pa and obtains secondary ingot, then by two
Secondary ingot u-turn is placed in the crucible that diameter is 450mm, is 33~35V in melting voltage, melting electric current is 13kA, true before melting
Reciprocal of duty cycle carries out melting three times under conditions of being 0.09Pa and obtains ingot three times.
Embodiment 2
The present embodiment the following steps are included:
Step 1: stock: being selected according to the ingredient of each component in target product Zr-4 zircaloy ingot casting and content
2.1942kg nuclear grade zirconium grain, 980.715kg sponge zirconium in nuclear leve, 13.5kg Sn, 2.2908kg Fe and 1.3kg Cr carry out it is standby
Material；
Step 2: the preparation of intermediate alloy: by the Fe of 0.2208kg, the Cr and 0.2272kg of the Sn of 1.35kg, 0.13kg
Nuclear grade zirconium grain carries out ingredient and simultaneously obtains 1.928kg intermediate alloy A through secondary smelting, by the Fe of 2.07kg, the Sn of 12.15kg,
Cr the and 1.967kg nuclear grade zirconium grain of 1.17kg carries out ingredient and obtains 17.357kg intermediate alloy B through secondary smelting；The melting
It is all made of vacuum non-consumable melting, the vacuum degree of the vacuum non-consumable melting is 0.42Pa, and Pressure Rise Rate is 0.2Pa/ before melting
min；The mass content of Fe is 0.2208% in the intermediate alloy A, and the number of intermediate alloy A is 48；The intermediate alloy B
The mass content of middle Fe is 0.23%, and the number of intermediate alloy B is 434；
Step 3: prepared by electrode: by intermediate alloy A obtained in 98.07kg sponge zirconium in nuclear leve and step 2 in 50MN electricity
It is pressed into electrode on extreme pressure machine and group is welded into consutrode A, is closed intermediate obtained in 882.64kg intermediate alloy B and step 2
Golden B is pressed into electrode on 50MN electrode press and group is welded into consutrode B；
Step 4: prepared by zircaloy ingot casting: consutrode A obtained in step 3 and consutrode B are carried out welding group
It is made into consutrode and uses consutrode A as the head of consutrode and be identified, be subsequently placed in vacuum consumable electric arc
Melting three times is carried out in furnace, obtains zircaloy ingot casting；The detailed process of the melting three times are as follows: by consutrode head upwards with
It is in the crucible of 280mm in melting voltage is 31~33V that auxiliary electrode welding, which is placed on diameter, and melting electric current is 9kA, before melting
Vacuum degree carries out melting once under conditions of being 0.12Pa and obtains an ingot, and an ingot u-turn is then placed on diameter and is
It is 32~34V in melting voltage, melting electric current is 11kA, under conditions of melting initial vacuum degree is 0.13Pa in the crucible of 360mm
It carries out secondary smelting and obtains secondary ingot, then the u-turn of secondary ingot is placed in the crucible that diameter is 450mm, be 33 in melting voltage
~35V, melting electric current are 13kA, and melting initial vacuum degree carries out melting three times under conditions of being 0.15Pa and obtains ingot three times.
Embodiment 3
The present embodiment the following steps are included:
Step 1: stock: selecting 2.21kg according to the ingredient of each component in target product Zr-4 zircaloy ingot casting and content
Nuclear grade zirconium grain, 980.713kg sponge zirconium in nuclear leve, 13.5kg the Cr of Fe and 1.3kg of Sn, 2.277kg stock up；
Step 2: the preparation of intermediate alloy: by the Fe of 0.207kg, Cr the and 0.241kg core of the Sn of 1.35kg, 0.13kg
Grade zirconium grain carries out ingredient and simultaneously obtains 1.928kg intermediate alloy A through secondary smelting, by the Fe of 2.07kg, the Sn of 12.15kg,
Cr the and 1.967kg nuclear grade zirconium grain of 1.17kg carries out ingredient and obtains 17.357kg intermediate alloy B through secondary smelting；The melting
It is all made of vacuum non-consumable melting, the vacuum degree of the vacuum non-consumable melting is 0.44Pa, and Pressure Rise Rate is 0.2Pa/ before melting
min；The mass content of Fe is 0.207% in the intermediate alloy A, and the number of intermediate alloy A is 48；The intermediate alloy B
The mass content of middle Fe is 0.23%, and the number of intermediate alloy B is 434；
Step 3: prepared by electrode: by intermediate alloy A obtained in 98.07kg sponge zirconium in nuclear leve and step 2 in 50MN electricity
It is pressed into electrode on extreme pressure machine and group is welded into consutrode A, is closed intermediate obtained in 882.6kg intermediate alloy B and step 2
Golden B is pressed into electrode on 50MN electrode press and group is welded into consutrode B；
Step 4: prepared by zircaloy ingot casting: consutrode A obtained in step 3 and consutrode B are carried out welding group
It is made into consutrode and uses consutrode A as the head of consutrode and be identified, be subsequently placed in vacuum consumable electric arc
Melting three times is carried out in furnace, obtains zircaloy ingot casting；The detailed process of the melting three times are as follows: by consutrode head upwards with
It is in the crucible of 280mm in melting voltage is 31~33V that auxiliary electrode welding, which is placed on diameter, and melting electric current is 9kA, before melting
Vacuum degree carries out melting once under conditions of being 0.13Pa and obtains an ingot, and an ingot u-turn is then placed on diameter and is
It is 32~34V in melting voltage, melting electric current is 11kA, under conditions of melting initial vacuum degree is 0.14Pa in the crucible of 360mm
It carries out secondary smelting and obtains secondary ingot, then the u-turn of secondary ingot is placed in the crucible that diameter is 450mm, be 33 in melting voltage
~35V, melting electric current are 13kA, and melting initial vacuum degree carries out melting three times under conditions of being 0.08Pa and obtains ingot three times.
The zircaloy ingot casting according to the method in GB/T8786-2010 prepared by 1~embodiment of embodiment 3 and comparative example 1
It is sampled, as shown in Figure 3 and Figure 4, sample position and quantity of sampling quantity are respectively as follows: in the upper surface center of circle of zircaloy casting head
Position (TC) takes 1 sample, three diameters two-by-two in 120 ° of angles is chosen on upper surface, respectively in every diameter (R)
(TM) takes 3 samples at 1/2, takes 3 samples at the edge (TE) of every diameter and cross section respectively；In zircaloy ingot casting side
The upper, middle and lower position of wall respectively takes 1 sample, according to the method recorded in GB/T13747-1992 using ICP-AES equipment to upper
The mass content for stating the Fe in sample is tested and analyzed, and wherein the mass content of the Fe of (TM) is that upper surface three is straight at R/2
On diameter at R/2 the mass content of (TM) Fe average value, the mass content of the Fe of edge (TE) is the Fe at three edges (TE)
Mass content average value, as a result as shown in table 1 below.
The mass content of Fe in zircaloy ingot casting prepared by 1 1~embodiment of embodiment 3 of table and comparative example 1
As it can be seen from table 1 in the upper surface of zircaloy casting head prepared by 1~embodiment of the embodiment of the present invention 3
At center location, R/2 and the mass content of the Fe of edge is respectively less than the zircaloy casting head corresponding position of the preparation of comparative example 1
The mass content of the Fe at place, 1~embodiment of embodiment 3 prepare zircaloy ingot casting side wall upper, middle and lower position at Fe matter
Amount content is not less than the mass content of the Fe of the zircaloy ingot casting corresponding position of the preparation of comparative example 1, illustrates preparation of the present invention
The lower intermediate alloy of Fe content is as the consutrode material for preparing zircaloy casting head, then obtains zirconium through vacuum melting and close
Golden ingot casting improves the head ferro element segregation phenomena of zircaloy ingot casting.
The above is only preferable profile embodiment of the invention, not does any restrictions to the present invention, all
According to inventive technique any simple modification substantially to the above embodiments, change and equivalent structural changes, this is still fallen within
In the protection scope of inventive technique scheme.
Claims (6)
1. a kind of method for solving the enrichment of zircaloy casting head ferro element, which is characterized in that method includes the following steps:
Step 1: stock: according to the nuclear leve of the ingredient of each component in target product zircaloy ingot casting and content selection corrresponding quality
Zirconium grain, sponge zirconium in nuclear leve and other component raw materials are stocked up, and other component raw materials include iron；
Step 2: the preparation of intermediate alloy: the nuclear grade zirconium grain in step 1 and other components in addition to sponge zirconium in nuclear leve is former
Expect ingredient in batches and carry out melting, obtains two batches intermediate alloy: intermediate alloy A and intermediate alloy B；The intermediate alloy A is in
Between the mass ratio of alloy B be 1:9, in intermediate alloy A the mass content of iron it is lower than the mass content of iron in intermediate alloy B 4%~
10%, the intermediate alloy A is identical as the constituent content in intermediate alloy B in addition to zirconium and iron；
Step 3: prepared by electrode: sponge zirconium in nuclear leve is suppressed with intermediate alloy A obtained in step 2 and intermediate alloy B respectively
Consutrode A and consutrode B are welded at electrode and group；Electrode is pressed into for intermediate alloy A in the sponge zirconium in nuclear leve
The mass ratio of sponge zirconium in nuclear leve and the sponge zirconium in nuclear leve that electrode is pressed into for intermediate alloy B is 1:9；
Step 4: prepared by zircaloy ingot casting: consutrode A obtained in step 3 and consutrode B being carried out welding and combined
Consutrode simultaneously uses head of the consutrode A as consutrode, is subsequently placed in vacuum consumable electrode arc furnace and is melted three times
Refining, obtains zircaloy ingot casting.
2. a kind of method for solving the enrichment of zircaloy casting head ferro element according to claim 1, which is characterized in that step
The mass content of iron lower than the mass content of iron in intermediate alloy B 4% in intermediate alloy A described in rapid two.
3. a kind of method for solving the enrichment of zircaloy casting head ferro element according to claim 1, which is characterized in that step
The mass content of iron lower than the mass content of iron in intermediate alloy B 7% in intermediate alloy A described in rapid two.
4. a kind of method for solving the enrichment of zircaloy casting head ferro element according to claim 1, which is characterized in that step
The mass content of iron lower than the mass content of iron in intermediate alloy B 10% in intermediate alloy A described in rapid two.
5. a kind of method for solving the enrichment of zircaloy casting head ferro element according to claim 1, which is characterized in that step
Melting described in rapid two uses the melting of vacuum non-consumable, and the vacuum degree of the vacuum non-consumable melting is less than 0.5Pa, presses before melting
The rate of liter is not more than 0.2Pa/min, and the quality of each intermediate alloy A and intermediate alloy B is not more than 40g.
6. a kind of method for solving the enrichment of zircaloy casting head ferro element according to claim 1, which is characterized in that step
Tack is machined out to ingot casting after each melting, three times two in fusion process in fusion process three times described in rapid four
It is respectively required for reversing end for end on an ingot and secondary ingot when the shove charge of secondary melting and three times melting.
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