Fracture Resistance of a Zirconium Alloy with Reoriented Hydrides

Autor:	Xihua He, Kwai S. Chan, Yi-Ming Pan
Rok vydání:	2014
Předmět:	Cladding (metalworking) Materials science Hydrogen Hydride Scanning electron microscope Metallurgy Zirconium alloy Metals and Alloys chemistry.chemical_element Condensed Matter Physics chemistry Mechanics of Materials Fracture (geology) Solvus Stress intensity factor
Zdroj:	Metallurgical and Materials Transactions A. 46:58-71
ISSN:	1543-1940 1073-5623
DOI:	10.1007/s11661-014-2225-1
Popis:	Zirconium alloy cladding materials typically contain circumferential hydrides that may be reoriented to align along the radial direction when the cladding tubes are heated above and then cooled below the solvus temperature. The objectives of this study were to investigate the critical stress levels required to cause hydride reorientation (HRT) and to characterize the fracture resistance of Zircaloy-2 after hydride reorientation. HRT heat-treatment was performed on hydrogen-charged Zircaloy-2 specimens at 593 K (320 °C) or 623 K (350 °C) for 1 to 2 hours, followed by cooling to 473 K (200 °C). Fracture testing was conducted on hydride-reoriented three-point bend specimens at 473 K (200 °C) using an in situ loading stage inside a scanning electron microscope. Direct observations indicated that the reoriented hydrides, which ranged from ≈1 to 22 μm in lengths, were more prone to fracture at larger sizes (>10 μm) compared to smaller sizes (
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fe42ecda40e0886fabad713742e86f39 https://doi.org/10.1007/s11661-014-2225-1 Zobrazit plný text záznamu Full text from SpringerLink