| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments V
|
| Presentation Title |
Real-time Neutron Diffraction to Support Interpretation of DSC Results on Zr-2.5Nb for Reactor Pressure Tubes |
| Author(s) |
Sven C. Vogel, Amy I. Fluke, Daniel J. Savage, Toshiro Tomida |
| On-Site Speaker (Planned) |
Sven C. Vogel |
| Abstract Scope |
Under postulated accident scenarios dual-phase Zr-Nb cladding or pressure tube material with α (hcp) and β (bcc) phases may be subjected to high temperature transients up to 1200°C, resulting in heating rate-dependent α-β phase transformation. Since the thermophysical properties are affected by the phase changes, it is important to understand this behavior in order to predict the performance under extreme thermal transient conditions. A hysteresis in calorimetry measurements was observed between heating and cooling. Furthermore, as-manufactured tube material showed a small enthalpy change during first heating that did not appear on subsequent heating. Neutron diffraction with an identical temperature profile (heating rate of 20C/min) was performed on the HIPPO diffractometer to understand these observations. Phase fractions, lattice parameters and texture evolution were tracked with a 15 second time resolution for comparison with previous DSC data and modelling of phase transformation textures using the Double-Burgers orientation relationship method. |