Bk Shah - Academia.edu (original) (raw)
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Zirconium base alloys are used as critical components of water cooled nuclear power reactors. The... more Zirconium base alloys are used as critical components of water cooled nuclear power reactors. The phase transformation and microstructural evolution in these alloys are complex. Depending on soaking temperature and cooling rate, the b phase of these alloys can transform into a variety of microstructures, viz., allotriomorph alpha, Widmanstatten alpha with parallelplates or basket-weave morphology, martensitic microstructure, and omega phase. An advanced numerical modeling technique, the "Phase field method" (PFM) has been used to study morphological evolution of b-Zr phase in dilute Zr-Nb alloys during b À Zr BCC ð Þ!a À ZrðHCPÞ transformation in mesoscopic scale. The nucleation events have been incorporated in the model both explicitly and implicitly. The growth rate and morphology selection have been investigated by varying the supersaturation, i.e., temperature and Nb content in Zr-Nb alloys. For Zr-2.5 %Nb with low undercooling, the driving force for plate growth decreases and at 1054 K it Manuscript
Zirconium base alloys are used as critical components of water cooled nuclear power reactors. The... more Zirconium base alloys are used as critical components of water cooled nuclear power reactors. The phase transformation and microstructural evolution in these alloys are complex. Depending on soaking temperature and cooling rate, the b phase of these alloys can transform into a variety of microstructures, viz., allotriomorph alpha, Widmanstatten alpha with parallelplates or basket-weave morphology, martensitic microstructure, and omega phase. An advanced numerical modeling technique, the "Phase field method" (PFM) has been used to study morphological evolution of b-Zr phase in dilute Zr-Nb alloys during b À Zr BCC ð Þ!a À ZrðHCPÞ transformation in mesoscopic scale. The nucleation events have been incorporated in the model both explicitly and implicitly. The growth rate and morphology selection have been investigated by varying the supersaturation, i.e., temperature and Nb content in Zr-Nb alloys. For Zr-2.5 %Nb with low undercooling, the driving force for plate growth decreases and at 1054 K it Manuscript