理化检验-物理分册2024，Vol.60Issue(3)：52-55,4.DOI:10.11973/lhjy-wl202403013
超临界汽轮机低压转子0Cr17Ni4Cu4Nb钢叶片断裂原因
Reasons for fracture of 0Cr17Ni4Cu4Nb steel blade in low-pressure rotors of supercritical steam turbines
摘要
Abstract
The last stage 0Cr17Ni4Cu4Nb steel blade of the low-pressure rotor of a certain supercritical steam turbine broke.The causes of blade fracture were analyzed using methods such as macroscopic observation,chemical composition analysis,scanning electron microscopy and energy spectrum analysis,metallographic examination and hardness testing.The results show that under flexible operating conditions,frequent changed in the load borne by the unit result in frequent and significant fluctuations in the inlet steam volume and steam flow of the low-pressure cylinder,led to flutter of the last stage blades with long blade shapes during operation.The root size of the last stage blade did not match the root groove,causing the blade root loose and blade shake,exacerbating blade flutter.Under the combined action of two factors,cracks appeared in the stress concentration area near the blade root on the outlet side of the unit.Under the alternating stress generated by blade flutter,the cracks continued to propagate in the form of fatigue,ultimately led to the overall fracture of the blade.关键词
0Cr17Ni4Cu4Nb钢叶片/疲劳断裂/颤振/显微组织Key words
0Cr17Ni4Cu4Nb steel blade/fatigue fracture/flutter/microstructure分类
通用工业技术引用本文复制引用
张涛,房军,李为刚,吕磊,周宏杰..超临界汽轮机低压转子0Cr17Ni4Cu4Nb钢叶片断裂原因[J].理化检验-物理分册,2024,60(3):52-55,4.基金项目
内蒙古电力科学研究院2022年科技资助项目(510241220006) （510241220006）
