研究了氢化物的形成特性和它对核燃料包覆管断裂机理的影响。同时还考察了冷却速度对氢化物尺寸、形态及分布的影响。研究指出 :高速冷却 (空冷 )有利于氢化物的均匀分布 ,而低速冷却 (炉冷 )容易使氢化物发生偏聚。此外 ,随着氢化物的形成 ,核燃料包覆管的室温强度稍有增加 , The formation of hydride and its influence on the fracture mechanism of the cladding tube were investigated. The effects of cooling rate on hydride size, morphology and distribution were also investigated. The research shows that high-speed cooling (air cooling) is beneficial to the uniform distribution of hydride, while low-speed cooling (furnace cooling) tends to segregate hydride. In addition, the room temperature strength of the nuclear cladding tube slightly increases with the formation of hydride,