Effects of Sn and Nb on the Grain Structure and Phase Transformation Temperature of Zr-Sn-Nb-Fe Zirconium Alloy AITranslate

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Chinese Library Classification Number:TG146.414[金属学及工艺—金属材料]

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The grain structure and phase transformation start temperatures of Zr-0.4Sn-1Nb-0.3Fe,Zr-1.2Sn-1Nb-0.3Fe and Zr-0.4Sn-0.65Nb-0.3Fe zirconium alloy sheets with different Sn and Nb contents were analyzed by optical microscope(OM),scanning electron microscope(SEM)and electron backscatter diffraction(EBSD).The results show that the variation in Sn and Nb contents exhibits negligible impact on the grain size of the zirconium alloy sheets.Nb demonstrates little influence on the recrystallization degree of the alloy,while an increase in Sn content proves conducive to alloy recrystallization.All three alloy sheets exhibit a fine and uniformly distributed recrystallized grain structure,with grain sizes finer than Grade 12.The increase in Sn content can raise the phase transformation start temperature of zirconium alloy,while an increase in Nb content slightly reduces the phase transformation start temperature of the alloy.