INVESTIGADORES
VICENTE ALVAREZ Miguel Angel
artículos
Título:
Hydride precipitation and stresses in zircaloy-4 observed by synchrotron X-ray diffraction
Autor/es:
J. R. SANTISTEBAN; M. A. VICENTE ALVAREZ; P. VISCAINO; A. D. BANCHIK; J.D. ALMER
Revista:
ACTA MATERIALIA
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2010 vol. 58 p. 6609 - 6618
ISSN:
1359-6454
Resumen:
The grain stresses within hydrides precipitated in rolled zircaloy-4 plates were determined by synchrotron X-ray diffraction experimentsusing an 80 keV photon beam and a high-speed area detector placed in transmission geometry. Results showed large compressivestresses (360 ± 20 MPa) in the hydrides along the plate rolling direction. The origin of these stresses was investigated by performinghydride dissolution/precipitation in situ for thermal cycles between room temperature and 400 C. A large stress hysteresis was observed,with a steady decrease on heating and an abrupt change on cooling. The observed stresses are explained by the constraint imposed bygrain boundaries on the growth of hydride platelets on the rollingtransverse plane of the rolled plates.
