Texture evolution of zircaloy-2 during beta-quenching: effect of process variables

Javier Romero, Michael Preuss, João Quinta Da Fonseca, Robert J. Comstock, Mats Dahlbäck, Lars Hallstadius

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

Abstract

The nuclear industry is interested in developing thermomechanical processes to produce random crystallographic orientation (texture) from cold-rolled Zircaloy-2 sheets used to manufacture boiling water reactor (BWR) channels. Randomized textures are beneficial because they minimize anisotropic irradiation-assisted growth, which in turn reduces bowing and uncontrolled deformation of BWR channels during service. The texture evolution of cold-rolled Zircaloy-2 sheets during the allotropic α→β→α phase transformation was characterized by using synchrotron X-ray diffraction in situ and electron backscatter diffraction. The initial strong rolling texture is weakened only if the α→β→α phase transformation is complete. Plastic deformation and grain growth in the β-phase lead to changes in the β texture and modify the inherited α texture. The global texture evolution is not sensitive to levels of stress that do not cause β plastic deformation. These findings demonstrate that accurate temperature control of the β-quenching process is of utmost importance in order to minimize undesirable irradiation growth of BWR channels during service, and that plastic deformation in the β phase can be employed to modify the inherited α texture. BWR channels with β-quenched textures will exhibit minimum irradiation growth caused by texture.

Original languageEnglish
Title of host publicationZirconium in the Nuclear Industry
Subtitle of host publication16th International Symposium
PublisherASTM International
Pages176-193
Number of pages18
ISBN (Print)9780803175150
DOIs
Publication statusPublished - 2011
Externally publishedYes
EventInternational Symposium on Zirconium in the Nuclear Industry 2010 - Chengdu, Sinchuan Province, China
Duration: 9 May 201013 May 2010
Conference number: 16th

Publication series

NameASTM Special Technical Publication
Volume1529 STP
ISSN (Print)0066-0558

Conference

ConferenceInternational Symposium on Zirconium in the Nuclear Industry 2010
CountryChina
CityChengdu, Sinchuan Province
Period9/05/1013/05/10

Keywords

  • Beta-quenching
  • Synchrotron X-ray diffraction
  • Texture
  • Variant selection
  • Zircaloy-2

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