I-SCC Behavior Evaluation of N36 Zirconium Alloy Cladding Using Ring Tensile Test
I-SCC Behavior Evaluation of N36 Zirconium Alloy Cladding Using Ring Tensile Test
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DOI：
10.1016/s1875-5372(15)30012-6
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发表时间：
2015-01-01
影响因子：
0.7
通讯作者：
Wang Meiling
中科院分区：
文献类型：
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作者：
Yan Meng;Yin Qiwei;Wang Meiling
通过环拉伸试验研究了N36锆合金包壳在350 ℃、10（2）、10（3）、10（4）Pa碘蒸气压下的碘致应力腐蚀开裂（I-SCC）行为。通过光学显微镜观察环向试样的形貌，分析环向拉伸载荷-位移曲线及相关参数，评价环向试样的I-SCC敏感性。试验后的试样断口显示出与无碘时杯-杯韧性断裂不同的碘蒸气中的脆性断裂。载荷-位移曲线和参数表明，与无碘环境相比，碘蒸气环境下的力学性能有所下降，且随着碘含量的增加，其下降更为显著。熔覆管韧性被认为是评价I-SCC敏感性的合适参数，结果表明，随着碘含量的增加，熔覆管韧性逐渐降低。
A ring tensile test was performed to study the iodine-induced stress corrosion cracking (I-SCC) behavior of N36 zirconium alloy cladding at 350 degrees C and in 10(2), 10(3), 10(4) Pa iodine vapor pressures. Morphologies of ring samples were observed by optical microscope, ring tensile load-displacement curves and parameters were analyzed to evaluate I-SCC susceptibility. The fracture surfaces of samples after test show the brittle fracture in iodine vapor which is different from cup-cup ductile fracture with non-iodine. Load-displacement curves and parameters show that the mechanical properties are degraded in iodine vapor environment compared to that in non-iodine environment, and more significantly decrease when increasing iodine content. Cladding tube toughness is considered to be an appropriate parameter to assess the I-SCC susceptibility; as a result, cladding toughness decreases gradually with the increasing of iodine content.