Title:
METHOD FOR MANUFACTURING NUCLEAR FUEL ZIRCONIUM PART BY USING MULTI-STAGE HOT-ROLLING
Document Type and Number:
WIPO Patent Application WO/2017/131260
Kind Code:
A1
Abstract:
The present invention provides a method for manufacturing a zirconium alloy part, the method allowing precipitates having an average size of 35 nm or less to be equally distributed in a matrix through a multi-stage hot-rolling step. Specifically, provided in the present invention is the method for manufacturing the zirconium alloy part, comprising: (step 1) a step of forming an ingot of niobium-contained zirconium alloys; (step 2) a step of thermally treating the ingot, manufactured in step 1, at a beta phase temperature of zirconium, and then rapidly cooling the same; (step 3) a step of preheating the ingot rapidly cooled in step 2, before hot-rolling; (step 4) a multi-stage hot-rolling step of performing primary hot-rolling right after preheating in step 3 is finished, and then performing secondary hot-rolling during air cooling; (step 5) a step of performing primary intermediate thermal treatment for a rolled material hot-rolled in multiple stages in step 4, and then primarily cold-rolling the same; (step 6) a step of performing secondary intermediate thermal treatment for the rolled material primarily cold-rolled in step 5, and then secondarily cold-rolling the same; (step 7) a step of performing tertiary intermediate thermal treatment for the rolled material secondarily cold-rolled in step 6, and then tertiarily cold-rolling the same; and (step 8) a step of finally thermally treating the rolled material tertiarily cold-rolled in step 7. A nuclear fuel zirconium alloy sheet material is manufactured by using the manufacturing method according to the present invention, such that the fine precipitates are formed in the matrix, thereby improving corrosion-resistance performance under a high-temperature vapor condition and increasing resistance to fatigue fracture.
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Inventors:
MOK YONG KYOON (KR)
KIM YOON HO (KR)
JUNG TAE SIK (KR)
LEE SUNG YONG (KR)
JANG HUN (KR)
LEE CHUNG YONG (KR)
NA YEON SOO (KR)
CHOI MIN YOUNG (KR)
KO DAE GYUN (KR)
LEE SEUNG JAE (KR)
KIM JAE IK (KR)
KIM YOON HO (KR)
JUNG TAE SIK (KR)
LEE SUNG YONG (KR)
JANG HUN (KR)
LEE CHUNG YONG (KR)
NA YEON SOO (KR)
CHOI MIN YOUNG (KR)
KO DAE GYUN (KR)
LEE SEUNG JAE (KR)
KIM JAE IK (KR)
Application Number:
PCT/KR2016/000967
Publication Date:
August 03, 2017
Filing Date:
January 29, 2016
Export Citation:
Assignee:
KEPCO NUCLEAR FUEL CO LTD (KR)
International Classes:
C22C16/00; B21B3/00; B21B37/16; C22F1/18; G21C21/00
Foreign References:
| KR20020062052A | 2002-07-25 | |||
| KR20060122823A | 2006-11-30 | |||
| KR20120102969A | 2012-09-19 | |||
| KR20090117414A | 2009-11-12 | |||
| KR20140118949A | 2014-10-08 | |||
| EP1225243A1 | 2002-07-24 | |||
| EP0198570A2 | 1986-10-22 | |||
| US4649023A | 1987-03-10 | |||
| US6902634B2 | 2005-06-07 | |||
| KR101265261B1 | 2013-05-16 |
Other References:
J. K. CHAKRAVARTTY; G. K. DEY, CHARACTERIZATION OF HOT DEFORMATION BEHAVIOR OF ZR-2.5NB-0.5CU USING PROCESSING MAPS, 1994
G. C. IMARISIO; M. COCCHI; G. FAINI, J. NUCL. MATER., vol. 37, 1970, pages 257
R. TEWARI ET AL., J. NUCL. MATER., vol. 383, 2008, pages 153
Y.H. JEONG ET AL., J. NUCL. MATER., vol. 302, 2002, pages 9
G. C. IMARISIO; M. COCCHI; G. FAINI, J. NUCL. MATER., vol. 37, 1970, pages 257
R. TEWARI ET AL., J. NUCL. MATER., vol. 383, 2008, pages 153
Y.H. JEONG ET AL., J. NUCL. MATER., vol. 302, 2002, pages 9
Attorney, Agent or Firm:
LEE, Un Cheol (KR)
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