150MW火电机组循环水泵轴断裂原因分析  

Analysis of Cracking Causes on Water Circulating pump Shaft of 150 MW Power Unit

作　　者：张涛[1] 田力男[1] 田峰[1] 韩晓春 赵元元 李红[1] 侯国新[1] 

机构地区：[1]内蒙古电力科学研究院,内蒙古呼和浩特010020 [2]内蒙古华电乌达热电有限公司,内蒙古乌海016040

出　　处：《华北电力技术》2013年第3期45-47,共3页North China Electric Power

摘　　要：1号机组甲循环水泵轴在运行中发生断裂,经综合试验分析认为,循环水泵轴断裂的主要原因是加工过程中未进行调质处理,生成大量晶粒粗大且强度很低的网状铁素体沿珠光体晶界分布,使晶间结合力减弱,严重削弱了材料的强度和韧性。此外,轴在高负荷、周期性应力作用下,首先在键槽底部尖角应力最为集中的地方萌生裂纹并在脆化的组织中迅速失稳扩展,进而导致轴体发生正断型斜面螺旋拉断脆性断裂。The shaft of No. 1 water circulating pump was broken when the unit is running. Through comprehensive analysis it showed that the modified treatment was deleted when shaft was processed and lots of coarse reticulate ferrite which distribute around pearlite was generated in this procedure. The intergranular binding force is descended, the strength and ductility are weaken. Besides, the crack was generated in sharp corner of key seat because of stress concentration under overload and cyclic stress, so the brittle tension fracture of normal inclined plane spiral was appeared.

关 键 词：循环水泵轴 调质处理 过负荷 应力集中 断裂 

分 类 号：TQ050.7[化学工程]