火电厂汽轮机叶片开裂原因分析
Analysis on Fracture Reasons of Turbine Blades in a Heat-power Plant
摘 要
某火电厂汽轮机末级动叶片在停机检修时发现端部进汽侧背弧面上存在一段裂纹，运用宏观观察、化学成分分析、硬度测试、金相检验、断口扫描及能谱分析等方法，对汽轮机叶片的开裂原因进行了分析。结果表明：汽轮机末级动叶片上的裂纹形成于进汽侧背弧面上的水蚀坑处，动叶片承受的拉应力以及氯离子腐蚀的工作环境，导致叶片发生了晶间应力腐蚀开裂。
开裂
氯离子
应力腐蚀开裂
turbine blade
cracking
chloride ion
stress corrosion cracking
Abstract
The last stage moving blades of a generators turbine in a heat-power plant were found cracking on extrados at the end of the steam admission side during maintenance downtime. The cracking reasons of the turbine blades were analyzed by macroscopic observation, chemical composition analysis, hardness testing, metallographic examination, fracture scanning and energy spectrum analysis. The results show that: the origin of the cracks was located in the water-eroded pits on the extrados surface of steam admission side of the last stage turbine blades; the intergranular stress corrosion cracking was caused by tensile stress of moving blades and the working environment of chloride ion corrosion.
中图分类号 TG172.5 DOI 10.11973/lhjy-wl201703011
所属栏目 质量控制与失效分析
基金项目
收稿日期 2016/6/2
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备注黎华(1964-),男,教授级高级工程师,硕士,主要从事特种设备检验研究工作,gzlihua@163.com。
引用该论文: LI Hua,LU Zhong-ming,LIU Ke-xiu,WANG Lian. Analysis on Fracture Reasons of Turbine Blades in a Heat-power Plant[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2017, 53(3): 197～200
黎华,卢忠铭,刘课秀,王恋. 火电厂汽轮机叶片开裂原因分析[J]. 理化检验－物理分册, 2017, 53(3): 197～200
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