俄罗斯汽轮机低压转子叶轮叶根槽裂纹原因分析  

Cause Analysis on Cracks in Impeller Blade Root Groove of Low-pressure Rotor of Russian Steam Turbines

作　　者：宋利 SONG Li(China Datang Corporation Science and Technology Research Institute Central-China Branch,Zhengzhou 450001,China)

机构地区：[1]中国大唐集团科学技术研究院有限公司华中分公司,河南郑州450001

出　　处：《热加工工艺》2018年第24期255-257,261,共4页Hot Working Technology

摘　　要：对出现裂纹的俄罗斯汽轮机叶轮叶根槽部位进行了光谱分析、力学性能实验和显微组织分析等。结果表明,机加工工艺的不规范、因水质处理引起的腐蚀介质的存在及长期腐蚀、材料抵抗腐蚀的能力较弱是造成叶根槽出现腐蚀疲劳、应力腐蚀裂纹的主要原因。根据分析结果提出了处理及改造建议。The spectral analysis, mechanical property test and microstructure analysis of the cracked impeller blade root groove of Russian turbines were carried out. The results show that the irregularity of the machining process, the existence of corrosive medium due to the water treatment and long term corrosion, and the weak resistance to corrosion are the main reasons for the appearance of the corrosion fatigue and stress corrosion cracking of impeller blade root groove. According to the analysis results,some suggestions for the treatment and the modification are proposed.

关 键 词：俄罗斯汽轮机 叶轮叶根槽 腐蚀疲劳 应力腐蚀 

分 类 号：TG111.91[金属学及工艺—物理冶金]