国内引进西屋电气公司技术生产的300MW、600MW汽轮机的低压转子为对称双流布置,而低压第6级(次末级)叶片已在多台机组上发生损坏事故,从该级叶片(因工作高度为474.62mm,简称“474”叶片)的结构、振动特性、应力集中、腐蚀环境等几个方面对叶片损坏原因进行了分析,提出了对该叶片的处理措施,并对需要开展的研究工作提出了建议。 The low voltage rotors of 300MW and 600MW turbines imported from Westinghouse Electric Company were symmetrically arranged in double flow. However, the low pressure 6th stage (second-last stage) blades have been damaged in many units. From this stage, 474.62mm, referred to as “474”), the causes of the blade damage were analyzed and the treatment measures for the blade were put forward, and the research work needed to be carried out Suggest.