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研究了N36锆合金包壳管在温度为593~723 K、应力为60~160 MPa条件下的拉伸蠕变行为。结果表明,本试验条件下N36锆合金管材存在不同的蠕变变形机制。593~673K下低应力范围内,蠕变应力因子n约为3,蠕变表观激活能Qapp≈150 k J·mol-1,蠕变变形受位错的粘滞性滑移过程控制;高应力范围内蠕变应力因子n为5~6,蠕变激活能Qapp≈170 k J·mol-1,遵循典型的5次幂律蠕变规律,蠕变变形受位错攀移过程控制。在723 K时,高应力范围内发生幂律失效。N36锆合金包壳管表现为典型的Class A型合金蠕变特征,表现出与Zircaloy合金不同的蠕变规律。
The tensile creep behavior of N36 zirconium alloy cladding tube under the condition of temperature of 593 ~ 723 K and stress of 60 ~ 160 MPa was studied. The results show that there are different creep deformation mechanisms of N36 zirconium alloy pipe under the experimental conditions. Under the low stress range of 593-673 K, the creep stress factor n is about 3 and the apparent activation energy Qapp≈150 kJ · mol-1. The creep deformation is controlled by the viscous slip process of dislocation. The creep stress factor n in the stress range is 5 ~ 6, and the creep activation energy Qapp≈170 kJ · mol-1. Following the typical law of power law creep, the creep deformation is controlled by the dislocation climbing process. At 723 K, a power law failure occurs in the high stress range. The N36 zirconium alloy cladding tube exhibits typical Class A alloy creep characteristics and exhibits different creep laws than Zircaloy alloys.