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累积退火参数(A)被广泛用于评价核反应堆用Zr-Sn系合金的耐水侧腐蚀性能。对于累积退火参数在新发展的含Nb锆合金中的应用,迄今未有一致意见,有学者认为传统的累积退火参数不再适用于含Nb锆合金的耐腐蚀性能的评价。本文综述了累积退火参数在常见牌号核用锆合金中的研究概况,并从A值的本质出发,解释了累积退火参数与锆合金微观组织之间的联系及其评价耐腐蚀性能的微观原因。提出合金元素的扩散速率(Fe、Cr扩散很快,Nb扩散极慢)是累积退火参数是否起作用的决定因素。指出累积退火参数可以直接用来评价低Nb锆合金的耐腐蚀性能,即A值越小,第二相粒子越细小弥散,合金的耐腐蚀性能越佳。
Cumulative annealing parameters (A) are widely used to evaluate the water-side corrosion resistance of Zr-Sn-based alloys for nuclear reactors. There is no consensus on the application of cumulative annealing parameters in the newly developed Nb-containing zirconium alloys. Some scholars think that the traditional cumulative annealing parameters are no longer suitable for evaluating the corrosion resistance of Nb-containing zirconium alloys. In this paper, the research status of cumulative annealing parameters in zirconium alloys with common grades is reviewed. Based on the nature of A value, the relationship between cumulative annealing parameters and the microstructure of zirconium alloys and their microscopic reasons for evaluating corrosion resistance are explained. It is proposed that the diffusion rate of alloying elements (Fe, Cr diffusion is very fast, Nb diffusion slow) is the determining factor of whether cumulative annealing parameters play a role. It is pointed out that the cumulative annealing parameters can be directly used to evaluate the corrosion resistance of low Nb-Zr alloy. That is, the smaller the A value, the finer the dispersion of the second phase particles, the better the corrosion resistance of the alloy.