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在不同碘浓度(碘加热温度分别为40℃,65℃,110℃)和流动高纯氩的气氛下,经再结晶退火和消除应力退火的非辐照锆-2和锆-4合金,分别在300℃,350℃和400℃的温度下,进行了单轴拉伸试验,以便了解材料状态、微观组织对锆合金碘致应力腐蚀行为的影响。试验结果表明,在应力腐蚀过程中的初始阶段,由于晶间腐蚀行为与材料微观组织有关,晶粒度对材料应力腐蚀行为(对不同碘浓度)均很敏感;在相同试验温度下,碘浓度增加使裂纹生长加快;随着试验温度提高,裂纹生长速率增加;由于织构影响,再结晶退火材料比消除应力退火的材料好。
In different iodine concentration (iodine heating temperature of 40 ℃, 65 ℃, 110 ℃) and the flow of high purity argon atmosphere, the recrystallization annealing and stress relief annealing of non-irradiated zirconium-2 and zirconium-4 alloy, respectively Uniaxial tensile tests were carried out at 300 ℃, 350 ℃ and 400 ℃ in order to understand the effect of the material state and microstructure on the iodine-induced stress corrosion cracking of zirconium alloys. The results show that in the initial stage of stress corrosion process, grain intergranular corrosion behavior is sensitive to material stress corrosion behavior (for different iodine concentrations) due to the intergranular corrosion behavior and material microstructure. Under the same experimental temperature, the iodine concentration As the test temperature increases, the crack growth rate increases. Due to the influence of texture, the recrystallization annealed material is better than that of the stress relieved annealed material.