EP0673691B1 - Procédé de fabrication d'une ébauche tubulaire en zircaloy 2 plaquée intérieurement en zirconium et apte au contrÔle ultrasonore de l'épaisseur de zirconium - Google Patents

Procédé de fabrication d'une ébauche tubulaire en zircaloy 2 plaquée intérieurement en zirconium et apte au contrÔle ultrasonore de l'épaisseur de zirconium Download PDF

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Publication number
EP0673691B1
EP0673691B1 EP95420069A EP95420069A EP0673691B1 EP 0673691 B1 EP0673691 B1 EP 0673691B1 EP 95420069 A EP95420069 A EP 95420069A EP 95420069 A EP95420069 A EP 95420069A EP 0673691 B1 EP0673691 B1 EP 0673691B1
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EP
European Patent Office
Prior art keywords
zirconium
zircaloy
extrusion
composite
billet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95420069A
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German (de)
English (en)
French (fr)
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EP0673691A1 (fr
Inventor
Philippe Moinard
Yvon Millet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie Europeenne du Zirconium Cezus SA
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Compagnie Europeenne du Zirconium Cezus SA
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/186—High-melting or refractory metals or alloys based thereon of zirconium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes

Definitions

  • the invention relates to a method of manufacturing a tubular zircaloy blank 2 clad internally with zirconium and intended for the production of composite cladding tubes for nuclear fuel.
  • the internal zirconium coating constitutes a barrier to the fission products and to the hydrogen generated in the fuel which have an embrittling action on the external zircaloy cladding 2 and therefore the thickness of this coating must be precisely controlled and reproducible.
  • the regularity of the thickness of the internal zirconium layer of Zy2 / Zr composite cladding tubes for nuclear fuel is an essential characteristic which should therefore be checked with great precision and systematically on each cladding tube and by the made on each composite tubular blank from which it originated.
  • the numerous aberrant measurements generally corresponded to anomalies in the reflection of the interface, distributed randomly along each tubular blank, each of the points of the surface of which describes, during the control, a helix whose pitch is defined by the rotational speed and advance of the blank.
  • the external zircaloy component 2 is obtained after working A1 of a bar full of Zy2 up to the diameter of 177 mm (150 mm ⁇ ⁇ ⁇ 200 mm) which, after heating A2 for 1 hour at 1050 ° C, A3 is quenched with possible A4 annealing for 3 to 5 hours between 750 ° C and 780 ° C. After cutting the bar into billets, they are machined A5 and drilled ( ⁇ e 168 mm, ⁇ i 78.8 mm).
  • the internal component of unalloyed zirconium is obtained by working B2 of an ingot of zirconium melted under vacuum B1, the iron content of which is between 250 and 1000 ppm.
  • B2 After cutting the forged bar into 172 mm diameter billets (150 ⁇ ⁇ ⁇ 200 mm) these are heated between 880 ° C and 1050 ° C to be quenched B3 then machined B4 ( ⁇ e 168 mm - ⁇ i 51 mm) before to be extruded B5 in the alpha domain with diameters ⁇ e 82 mm and ⁇ i 47 mm in the form of tubes; each tube being machined to 78e 78.8 mm and ⁇ i 48 mm before positioning for assembly C1 inside the substantially coaxial hole of the zircaloy billet 2 machined and drilled.
  • the assembly C1 thus formed is spun C2 in the alpha domain, preferably around 600 ° C, to obtain a composite extruded blank ( ⁇ e 80 mm, ⁇ i 48 mm) which is cold rolled C3 to ⁇ e 63, 5 mm and ⁇ i 41.5 mm to give a composite tubular blank subjected to a possible final heat treatment. Under these conditions and as previously indicated, only 30% of the thickness measurements of the internal zirconium cladding can be used.
  • a first solution shown diagrammatically in FIG. 2, to improve the regularity of the Zy2 / Zr interface and above all to create an index difference of grain size ⁇ I at least equal to 2, consists in performing after quenching A3 of the zircaloy 2 bar a working in the alpha domain causing a very significant refinement of the grain size of zircaloy 2 at the roughing stage which is preserved after C1 assembly, C2 spinning and C3 rolling of the composite tubular blank, and allowing to significantly regularize the Zy2 / Zr interface.
  • the alpha hardening of an already wrought bar A'1 is carried out by forging or rolling to a diameter of approximately 300 mm ( 250 to 350 mm) and not 177 mm (150 to 200 mm) according to the prior art.
  • the bar diameter is reduced by forging A4 in alpha phase up to ⁇ 177 mm before cutting, machining and drilling the A5 billets. ready for C1 assembly and transformation according to the prior art.
  • the second solution shown schematically in fig. 3, makes it possible to improve the regularity of the Zy2 / Zr interface of composite tubular blanks just as significantly and above all to obtain ⁇ I ⁇ 2. It consists in acting on the grain size of the full or pre-drilled billets of zircaloy 2 after quenching A3 and optionally annealed A4 by performing a drilling operation by spinning with the press A'4 between 400 ° C and 600 ° C according to the process described in patent FR 2,685,881 relating to the manufacture of zirconium-based duplex and triplex tubes. This process recommends using a conventional direct spinning press the spinning with discharge on a zirconium or zirconium alloy billet punch to improve and regularize the internal surface structure of the tubular element to be produced.
  • the Applicant has found experimentally that the regularity of the interface closely depends on the micrographic structures of the 2 components of the assembly before spinning and that the interface resulting from said assembly was all the more irregular as the phase needles ex beta, originating from quenching from the beta domain of zircaloy 2 were wider.
  • a particularly effective working of the internal face of the Zy2 blank is obtained which will be placed in contact with the external face of the tubular blank in unalloyed Zr.
  • a third solution shown diagrammatically in FIG. 4, also leads to perfectly acceptable precision and reproducibility of the measurements and consists in specifically favoring the magnification of the grain of the unalloyed zirconium blank during its preparation by a heat treatment of specific recrystallization B'5 of the tubular zirconium blank after spinning in the alpha B5 domain.
  • This heat treatment is carried out at a sufficient temperature 500 ° C to 780 ° C for 1 hour to 4 hours and preferably at 730 ° C for 3 hours, to obtain a grain magnification whose ASTM index is between 4 and 6 .
  • a 4th solution a little less effective but easy to carry out indistrially, is shown diagrammatically in FIG. 5. It consists in performing on the composite tubular blank either a recrystallization annealing C'2 after assembly C1, spinning C2 according to the prior art, or a recrystallization annealing C4 after assembly C1, spinning C2, optionally a recrystallization annealing C'2 then rolling C3.
  • This recrystallization annealing C'2 and / or C4 is carried out under such conditions, generally 1 to 3 hours between 700 ° C and 730 ° C, that on the internal zirconium cladding a grain size index of at least 7 and preferably 8 while keeping a grain size index of at least 9 and preferably 10 with an index difference ⁇ I ⁇ 2 on the external zircaloy 2 sheath.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)
EP95420069A 1994-03-24 1995-03-20 Procédé de fabrication d'une ébauche tubulaire en zircaloy 2 plaquée intérieurement en zirconium et apte au contrÔle ultrasonore de l'épaisseur de zirconium Expired - Lifetime EP0673691B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9403724A FR2717717B1 (fr) 1994-03-24 1994-03-24 Procédé de fabrication d'une ébauche tubulaire en zircaloy 2 plaquée intérieurement en zirconium et apte au contrôle ultrasonore de l'épaisseur de zirconium.
FR9403724 1994-03-24

Publications (2)

Publication Number Publication Date
EP0673691A1 EP0673691A1 (fr) 1995-09-27
EP0673691B1 true EP0673691B1 (fr) 1997-08-13

Family

ID=9461569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95420069A Expired - Lifetime EP0673691B1 (fr) 1994-03-24 1995-03-20 Procédé de fabrication d'une ébauche tubulaire en zircaloy 2 plaquée intérieurement en zirconium et apte au contrÔle ultrasonore de l'épaisseur de zirconium

Country Status (5)

Country Link
US (1) US5609697A (ja)
EP (1) EP0673691B1 (ja)
JP (1) JP2923224B2 (ja)
DE (1) DE69500537T2 (ja)
FR (1) FR2717717B1 (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6243433B1 (en) * 1999-05-14 2001-06-05 General Electic Co. Cladding for use in nuclear reactors having improved resistance to stress corrosion cracking and corrosion
US8116423B2 (en) 2007-12-26 2012-02-14 Thorium Power, Inc. Nuclear reactor (alternatives), fuel assembly of seed-blanket subassemblies for nuclear reactor (alternatives), and fuel element for fuel assembly
KR101474864B1 (ko) 2007-12-26 2014-12-19 토륨 파워 인코포레이티드 원자로(대용물), 원자로(대용물)를 위한 드라이버-브리딩 모듈들로 구성된 연료 집합체 및 연료 집합체용 연료 요소
EP2372717B1 (en) 2008-12-25 2016-04-13 Thorium Power, Inc. Fuel assembly for a light-water nuclear reactor and light-water nuclear reactor
WO2011143172A1 (en) 2010-05-11 2011-11-17 Thorium Power, Inc. Fuel assembly with metal fuel alloy kernel and method of manufacturing thereof
US10170207B2 (en) 2013-05-10 2019-01-01 Thorium Power, Inc. Fuel assembly
US10192644B2 (en) 2010-05-11 2019-01-29 Lightbridge Corporation Fuel assembly
CN104368623B (zh) * 2014-11-29 2016-05-25 攀钢集团成都钢钒有限公司 一种大口径不锈钢无缝钢管的生产方法
CN107470385A (zh) * 2017-08-02 2017-12-15 安徽骏达起重机械有限公司 悬吊轨道加工方法
CN111036705B (zh) * 2019-12-19 2021-07-02 湖南金天钛业科技有限公司 大口径钛合金无缝管材及其制备方法
CN111286686B (zh) * 2020-04-09 2021-09-10 西部钛业有限责任公司 一种tc4钛合金细等轴组织大规格棒材短流程制备方法
CN112775203B (zh) * 2020-12-23 2024-01-19 西部新锆核材料科技有限公司 一种锆或锆合金挤压型材的制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4294631A (en) * 1978-12-22 1981-10-13 General Electric Company Surface corrosion inhibition of zirconium alloys by laser surface β-quenching
US4390497A (en) * 1979-06-04 1983-06-28 General Electric Company Thermal-mechanical treatment of composite nuclear fuel element cladding
FR2579122B1 (fr) * 1985-03-19 1989-06-30 Cezus Co Europ Zirconium Procede de fabrication de tubes-gaines composites pour combustible nucleaire et produits obtenus
US4671826A (en) * 1985-08-02 1987-06-09 Westinghouse Electric Corp. Method of processing tubing
US5223206A (en) * 1992-06-08 1993-06-29 General Electric Company Method for producing heat treated composite nuclear fuel containers
SE506174C2 (sv) * 1992-12-18 1997-11-17 Asea Atom Ab Metod att framställa kärnbränsleelement

Also Published As

Publication number Publication date
DE69500537T2 (de) 1998-02-05
US5609697A (en) 1997-03-11
FR2717717A1 (fr) 1995-09-29
JP2923224B2 (ja) 1999-07-26
FR2717717B1 (fr) 1996-05-15
EP0673691A1 (fr) 1995-09-27
DE69500537D1 (de) 1997-09-18
JPH07306279A (ja) 1995-11-21

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