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研究了两种组织形貌相似的先进锆合金M5TM和N36锆合金核燃料包壳管材的单轴拉伸和内压蠕变性能。利用X射线衍射仪分析了它们的织构。试验发现两种先进锆合金包壳材料的蠕变性能表现出明显的各向异性。根据试验条件下的蠕变机理,结合弹性粘塑性自洽模型定性地分析了织构对锆合金管材蠕变各向异性的影响,解释了先进锆合金各向异性随应力指数变化的共性规律。揭示了织构与先进锆合金管材蠕变各向异性的定性关系。由于成分和织构因素的共同作用,在研究的试验条件下,N36合金的初始蠕变应变、稳态蠕变速率低于M5合金。织构是合金蠕变行为产生各向异性的主要原因,对于再结晶状态的先进锆合金包壳管,具有(0002)织构特征时,应力指数越高(即施加的应力水平越高),其蠕变的各向异性值越大。
The uniaxial tensile and internal pressure creep properties of two kinds of advanced zirconium alloy M5TM and N36 zirconium alloy nuclear fuel cladding tubes with similar microstructures were investigated. Their texture was analyzed by X-ray diffractometry. The experimental results show that the creep properties of the two advanced zirconium alloy claddings show obvious anisotropy. The influence of texture on the anisotropy of zirconium alloy pipe was qualitatively analyzed according to the creep mechanism under the experimental conditions and the self-consistent elastic viscoplasticity model. The common law of the anisotropy of the advanced zirconium alloy with the change of stress index was explained. The qualitative relationship between the texture and the anisotropy of advanced zirconium alloy pipe was revealed. Due to the combination of composition and texture factors, the initial creep strain and steady creep rate of N36 alloy are lower than that of M5 alloy under the experimental conditions studied. Texture is the main reason for the anisotropy of the creep behavior of the alloy. For the advanced zirconium alloy cladded tube in the recrystallized state with (0002) texture, the higher the stress index (ie, the higher the applied stress level) The greater the anisotropy of creep value.