新型高效超临界660MW汽轮机启动变温准则的解析

合理使用变温准则,能在保证汽轮机安全性的前提下,实现快速的自动启动。介绍了660MW超临界汽轮机启动变温准则的设计理念和关键要点,特别说明了汽轮机关键部件的失配温度决定了热应力水平,变温准则相关参数的选取是综合权衡低周寿命损耗率和快速启动要求的结果。研究成果可为各型汽轮机制定基于失配温度的自动启动准则提供参考。

Evolution of misfit dislocation network and tensile properties in Ni-based superalloys:a molecular dynamics simulation

The structural evolution of dislocation network is closely related to y' rafting and tensile properties. In this work, the effects of strain rate and temperature on the structural evolution of interface dislocation network in Ni-based superalloys are studied by molecular dynamics simulations. The correlation between the evolution of dislocation network and tensile properties is also explored. The results indicate that the dislocation network shows different degrees of deformation and damage at various strain rates and temperatures. The ),' rafting depends on the damage structure of dislocation network at various strain rates and tem- peratures. Moreover, the tensile properties of interface in Ni-based superalloys are closely related to the evolution of disloca- tion network and dislocation motion mechanisms.