N6—35-Ⅱ6000kW汽轮发电机组复二排叶片断裂失效分析

Fracture Analysis on Double Second Array Paddle of N6-35-Ⅱ Type 6000kW Turbo-Unit

复二排动叶片,由于电厂机组经常处在开开停停,且蒸汽中会有大量促使孔蚀的卤素离子而产生蛀孔(即疲劳源),最终因腐蚀疲劳而断裂.

The double second array dynamic paddles generate the''shot-hole' (fatigue source), becaues turbo-unit workes under frequent starting/stopping condition and in the steam environment, there are a lot of halogen ions which promate the hole erosion and result in erosion fatigue.