Some observations on time-hardening and strain-hardening rules for creep in Zircaloy-2
The role of accurate creep prediction in zirconium alloys, and the Zircaloys in particular, has become increasingly important in light water reactor core component design and behavior analyses. A study was made of the applicability of time-hardening and strain-hardening rules to describe creep deformation in Zircaloy-2 under variable stress and temperature conditions. Variable stress and variable temperature creep data were compared to isotonic (iso-stress) and isothermal data in the stress regime 69 to 172 MPa and the temperature regime 325 to 400/degree/C. It was observed that creep deformation under these variable conditions does not follow a time-hardening rule. This paper formulates strain-hardening rule, which describes well the variable temperature creep deformation at temperatures up to 375/degree/C. At 400/degree/C, however, the strain-hardening rule broke down because of a nonnegligible recovery rate. 28 refs.
- Research Organization:
- Univ of Calif, Santa Barbara, USA
- OSTI ID:
- 5339869
- Journal Information:
- Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 53:1; ISSN NUTYB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
220200* -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
AGE HARDENING
ALLOYS
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
CREEP
HARDENING
IRON ADDITIONS
IRON ALLOYS
MATERIALS
MECHANICAL PROPERTIES
REACTOR COMPONENTS
REACTOR CORES
REACTOR MATERIALS
STRAIN HARDENING
TIN ALLOYS
ZIRCALOY
ZIRCALOY 2
ZIRCONIUM ALLOYS
ZIRCONIUM BASE ALLOYS