Effect of High Temperature Oxidation on the Mechanical Properties of Zr-1Nb-1Sn-0.1Fe Alloy Cladding Tubes
Zr-1Nb-1Sn-0.1Fe 합금 핵연료피복관의 고온산화막 형성이 기계적 특성에 미치는 영향

Sun Ig Hong, Eun Kyu Lee
2013 Korean Journal of Metals and Materials  
The effect of high temperature oxidation on the mechanical properties of Zr-1Nb-1Sn-0.1Fe alloy cladding tubes were studied. The oxidation rate was far greater at 700 than at 600 , reflecting the increasing volume fraction of porous monoclinic ZrO2. The ductility increased and strength decreased after oxidation at 600 , suggesting softening due to recovery, and recrystallization was predominant over the ductility loss caused by oxidation. In the temperature range between 200 and 450 , the flow
more » ... and 450 , the flow stress is greater in the oxidized Zr alloy than that annealed at 600 in a vacuum, suggesting the increased contribution of dynamic strain aging associated with the diffusion of oxygen atoms into a Zr matrix. At 700 , the ductility decreased significantly after oxidation due to crack propagation into the Zr alloy matrix from the brittle oxide. A stress plateau and a decrease in ductility were observed even in Zr-1Nb-1Sn-0.1Fe with thick brittle oxide after oxidation at 700 for 24 hrs in air, suggesting the deformation mechanism was not greatly affected by oxidation.
doi:10.3365/kjmm.2013.51.1.015 fatcat:qbe4ijzhvvcengykops4hlzi2e