【摘要】 将ZIRLO锆合金样品分别进行1000℃-0.5h、1000℃-0.5h /560℃-10h、1000℃-0.5h /冷轧/560℃-10h和750℃-0.5h、750℃-0.5h /560℃-10h、750℃-0.5h /冷轧/560℃-10h的不同处理,用透射电镜观察了它们的显微组织,将它们放入高压釜中,研究了在350℃、16.8MPa、0.04M LiOH水溶液中的耐腐蚀性能。结结果果表表明明,,在本文所有的变形及热处理条件中,750℃-0.5h /冷轧/560℃-10h处理后样品的耐腐蚀性能最好。其原因在于样品经过这样处理后,基体aZr中固溶的Nb含量较低,并获得了纳米尺寸分布的βNb(含Fe)第二相粒子,后者对改善耐腐蚀性能尤为重要。样品在最终560℃加热处理之前的冷轧变形,可以促进βZr分解时的形核,是获得纳米尺寸βNb的必要措施。更多还原

【Abstract】 The specimens of ZIRLO alloy were treated in different ways at 1000℃-0.5h、1000℃- 0.5h/560℃-10h、1000℃-0.5h /C.R.(cold rolling)/560℃-10h and 750℃-0.5h、750℃-0.5h /560℃-10h、750℃-0.5h /C.R/560℃-10h respectively, and their microstructures were examined by transmission electron microscopy (TEM). Lastly, the corrosion characteristics were investigated with autoclave tests in 0.04M LiOH aqueous solution at 350℃、16.8MPa. It has been found that the corrosion resistance of specimens treated at 750℃-0.5h / C.R /560℃-10h is the best among all specimens treated in different ways in this work. It is concluded that a lower niobium concentration in solid solution in aZr matrix and a uniform distribution of nanoscaleβNb(containing iron) particles, especially the later one, are important factors for improving the corrosion resistance significantly. The cold deformation before the final annealing at 560℃ plays an important role in obtaining nanoscaleβNb particles because it can promote the nucleation during theβZr decomposition.更多还原