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Recrystallization rate measurement method of zirconium alloy cladding of nuclear fuel rod using EBSD pattern quality

  • US 10,641,719 B2
  • Filed: 07/20/2018
  • Issued: 05/05/2020
  • Est. Priority Date: 11/17/2017
  • Status: Active Grant
First Claim
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1. A recrystallization rate measurement method of zirconium alloy cladding of a nuclear fuel rod, the method comprising:

  • irradiating Scanning Electron Microscopy (SEM) electron beams at a given scanning interval onto a completely recrystallized first zirconium alloy specimen, a partially recrystallized second zirconium alloy specimen to be measured for recrystallization rate, and an as-deformed third zirconium alloy specimen which were electropolished and obtaining electron backscattered signals therefrom by an Electron Backscattter Diffraction (EBSD) camera (step

         1);

    converting the electron backscattered signals obtained from the first zirconium alloy specimen to the third zirconium alloy specimen into pattern quality values, respectively, by using an EBSD software and generating the pattern quality values as frequencies by a specified interval (step

         2);

    obtaining pattern quality frequencies (B+D) deviated from the frequency distribution of the third zirconium alloy specimen among a whole frequency distribution of the second zirconium alloy specimen, and pattern quality frequencies (D+E) deviated from the frequency distribution of the third zirconium alloy specimen among a whole frequency distribution of the first zirconium alloy specimen (step

         3); and

    obtaining the recrystallization rate, X′

    , of the second zirconium alloy specimen with an equation of

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