超超临界机组汽轮机轴瓦失效分析  

The turbine bush failure analysis of ultra supercritical unit

作　　者：刘鸿国[1] 

机构地区：[1]华能玉环电厂,浙江玉环317604

出　　处：《华电技术》2009年第10期11-15,53,共6页HUADIAN TECHNOLOGY

摘　　要：对某电厂某机组#1轴瓦发生脱胎的巴氏合金进行了化学成分分析、金相组织分析、XRD分析和X射线能谱分析等测试。分析结果显示,Sb含量符合要求,Cu,Pb,Zn含量均超标;巴氏合金组织中β′相(SnSb)在个别位置存在的轻度偏析,但未发现严重的偏析、分层及其他铸造缺陷;ε相(Cu6Sn5)和β′相(SnSb)两相之和所占比例平均值为39.5%;在结合面处挂锡层的合金侧有ε层。建议同类部件的订货协议中应明确提出允许的化学成分偏差范围及合金层硬质相含量要求。A babbit peel off fault was take place in No.1 bush of an unit in some plant.The chemical composition analysis,the metallurgical structure analysis,The XRD analysis and the X-ray energy spectrum analysis were accomplished for the peeled babbit alloy.The results show that the Sb content was accorded with the requirement,and the contents of Cu,Pb and Zn were not conformed to the standard.In the babbit alloy,the β′ phase(SnSb) exist slight aliquation at individual local position,but serious aliquition,delamination and other casting defects were not discovered.The average proportion of the sum of ε phase(Cu6Sn5) and β′ phase(SnSb) was 39.5%,there was ε layer discovered at the alloy side of joint surface Sn layer.It is suggest that the allowed chemical composition deviation range and the contents requirement of hard phases should be listed clearly in the order agreement of same parts.

关 键 词：巴氏合金 脱胎 ε相(Cu6Sn5) β’相(SnSb) 

分 类 号：TK263.64[动力工程及工程热物理—动力机械及工程]