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Title: Crystallographic texture and microstructural changes in fusion welds of recrystallized Zry-4 rolled plates

This study presents a detailed characterization of the microstructural and crystallographic texture changes observed in the transition region in a weld between two Zircaloy-4 cold rolled and recrystallized plates. The microstructural study was performed by optical microscopy under polarized light and scanning electron microscopy (SEM). Texture changes were characterized at different lengthscales: in the micrometric size, orientation imaging maps (OIM) were constructed by electron backscatter diffraction (EBSD), in the millimetre scale, high energy XRD experiments were done at the Advanced Photon Source (USA) and compared to neutron diffraction texture determinations performed in the HIPPO instrument at Los Alamos National Laboratory. In the heat affected zone (HAZ) we observed the development of Widmanstätten microstructures, typical of the α( hcp) to β( bcc) phase transformation. Associated with these changes a rotation of the c-poles is found in the HAZ and fusion zone. While the base material shows the typical texture of a cold rolled plate, with their c-poles pointing 35° apart from the normal direction of the plate in the normal-transversal line, in the HAZ, c-poles align along the transversal direction of the plate and then re-orient along different directions, all of these changes occurring within a lengthscale in the order ofmore » mm. The evolution of texture in this narrow region was captured by both OIM and XRD, and is consistent with previous measurements done by Neutron Diffraction in the HIPPO diffractometer at Los Alamos National Laboratory, USA. The microstructural and texture changes along the HAZ were interpreted as arising due to the effect of differences in the cooling rate and β grain size on the progress of the different α variants during transformation. Fast cooling rates and large β grains are associated to weak variant selection during the β–>α transformation, while slow cooling rates and fine β grains result in strong variant selection.« less
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  1. Centro Atomico Bariloche, CNEA-CONICET (Argentina)
  2. Centro Atomico Ezeiza, CNEA-CONICET (Argentina)
  3. Univ. Nacional de Cordoba (Argentina)
  4. Queen's Univ., Kingston, ON (Canada)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 488; Journal Issue: C; Journal ID: ISSN 0022-3115
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
International Atomic Energy Agency (IAEA); USDOE
Country of Publication:
United States
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Fusion welding; High energy X-Ray diffraction; Variant selection; GTAW; Heat affected zone; PAW; Phase transformations; Texture; Zirconium
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1396887