Biaxial Creep Behavior of Nb-Modified Zircaloys

Joshi, Pratik; Tillman, Micah; Kumar, Nilesh; Murty, Korukonda; Cinbiz, Nedim

doi:10.1080/00295450.2019.1674581

Biaxial Creep Behavior of Nb-Modified Zircaloys

Journal Article · Fri Nov 22 00:00:00 EST 2019 · Nuclear Technology

DOI:https://doi.org/10.1080/00295450.2019.1674581· OSTI ID:1631160

^[1]; Tillman, Micah ^[1]; Kumar, Nilesh ^[2]; Murty, Korukonda ^[1]; Cinbiz, Nedim ^[3]

North Carolina State Univ., Raleigh, NC (United States)
North Carolina State Univ., Raleigh, NC (United States); Univ. of Alabama, Tuscaloosa, AL (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)

Zr-Nb alloys are used as cladding materials to encapsulate radioactive fuel in nuclear reactors. They possess excellent corrosion resistance at high temperatures making it possible to achieve high fuel burn-up directly increasing the thermal efficiency of the reactor. While they are commonly used in recrystallized (Rx) form in boiling water reactors, there is a need to understand the effect of cold work and stress relief (CWSR) on biaxial creep characteristics of these materials due to their use in pressurized water reactors. In this study, the biaxial creep behaviors of as-received Zr-Nb alloys, HANA and Zirlo, have been investigated at 500 and 400 0C respectively using internally pressurized tubing superimposed with axial load under varied hoop (s?) to axial (sz) stress ratios of 0 to 2 while monitoring both the axial and hoop strains using an LVDT and a laser telemetric extensometer respectively. The crystallographic textures and creep loci of these as-received Zr-Nb alloys have been evaluated to correlate with the previous studies on recrystallized HANA4 and CWSR Zircaloy-4. The creep locus of HANA4 was found to be unaffected by initial state (CWSR or Rx) and showed close correspondence to planar isotropy while the creep locus of CWSR Zirlo exhibited more resistance to axial deformation than diametrical as per CWSR Zircaloy4 reported earlier. These differences are shown to arise from grain shape anisotropy of CWSR Zirlo and Zircaloy4. The simulated creep loci using crystallite orientation distribution functions (CODFs) in conjunction with prism slip models, showed excellent agreement with experimental results.

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1631160

Report Number(s):: INL/JOU--19-55019-Rev000

Journal Information:: Nuclear Technology, Journal Name: Nuclear Technology Journal Issue: 5 Vol. 206; ISSN 0029-5450

Publisher:: Taylor & Francis - formerly American Nuclear Society (ANS)Copyright Statement

Country of Publication:: United States

Language:: English

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