CFETR第一壁候选材料奥氏体钢的辐照后蠕变寿命分析

Post-Irradiation Creep Lifetime Analysis on Austenitic Steels as the CFETR First Wall Candidate Materials

为了研究奥氏体钢作为中国聚变工程实验堆第一壁候选结构材料时的蠕变寿命,利用有限元方法和Larson-Miller蠕变寿命外推模型,结合奥氏体钢的辐照后蠕变断裂实验数据,探讨了热流密度、壁厚和冷却剂入口温度等参数对蠕变寿命的影响,分析比较了AISI316、冷加工AISI316及含Ti冷加工15-15Ti的辐照后蠕变性能。结果表明:奥氏体钢的辐照后蠕变寿命随热流密度、壁厚和冷却剂入口温度的增大而减小;冷加工处理并没有提升奥氏体钢的辐照后蠕变寿命,而含Ti冷加工15-15Ti具有较优异的辐照后蠕变性能。

In order to investigate the creep lifetime of austenitic steels as a candidate structure material of the first wall for China Fusion Engineering Test Reactor（CFETR）,the effects of density of heat flow rate,wall thickness,and coolant inlet temperature on the creep lifetime of austenitic steels are explored with the finite element method and LarsonMiller creep lifetime extrapolation model based on the post-irradiation creep experimental data of austenitic steels.The post-irradiation creep properties of AISI316,cold-worked AISI316,and cold-worked 15-15 Ti containing Ti element are discussed and compared as well.The results indicate that post-irradiation creep lifetime decreases with the increases of the density of heat flow rate,wall thickness,and coolant inlet temperature.Cold working has little contribution to improvement of the post-irradiation creep lifetime for austenitic steels.Relatively,cold-worked 15-15 Ti with Ti has a better post-irradiation creep performance.