Conference Proceedings Paper
Characterization of Excel Alloy Pressure Tube Material for CANDU SCW Reactors
36th Annual CNS-CNA Student Conference - 2012 June 12
Mohammad Sattari (Queen's University )
Richard Holt (Queen's University )
Mark Daymond (Queen's University )
The phase transformation temperatures, aging response, and creep rupture strength of Zr alloy Excel (Zr- 3.5%Sn- 0.8%Nb- 0.8%Mo) pressure tube material were investigated. The ? ? ? +? and ?+ ? ? ? transus temperatures were found to be in the range of 600-690 °C and 962-975 °C respectively. Precipitation hardening was observed in the microstructures water-quenched from high in the ?+? or ? regions followed by aging at 400-500 °C for 1 hr. The results of creep-rupture experiments at 400 °C suggest that a fully martensitic and aged microstructure has better creep properties at high stress levels (>700 MPa) and a microstructure obtained by air-cooling from high in the ?+? region shows good creep properties at lower stresses (<560 MPa).
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