供水装置Z45T-10型控制闸阀阀体的断裂原因  

Fracture Causes of Z45T-10 Type Control Valve Body for Water Supply

作　　者：伍超群 WU Chao-qun(Guangdong Industrial Analysis and Testing Center,Guangzhou 510650,Guangdong,China)

机构地区：[1]广东省工业分析检测中心,广东广州510650

出　　处：《铸造》2020年第10期1110-1113,共4页Foundry

基　　金：广东省科学院发展专项资金项目(2018GDASCX-0114)。

摘　　要：Z45T-10型控制闸阀在常规条件下使用不到设计时间即发生爆裂。通过宏观检验、化学成分分析、金相组织检验、硬度测试以及电镜微观观察等方法对控制闸阀阀体爆裂原因进行分析。结果表明,控制闸阀阀体由灰铸铁制作而成,基体组织为铁素体型灰铸铁,材质中Si高Mn低,不符合HT100标准要求,且Si/C比偏高,部分区域石墨粗大,极大地降低了阀体的力学性能,在外界气压的不断作用下,从而造成控制闸阀阀体的脆性断裂。When the Z45T-10 type control valve burst, it served less than the design time under normal conditions. Thereby the cracking causes of the control valve body was investigated by macro-examination, chemical composition analysis, microstructure observation, hardness testing and electron microscope analysis. The experimental results show that the control valve body was made of gray cast iron with a ferrite matrix structure, and contained high silicon content and low manganese content, which do not comply with HT100 standard technical specification. Meanwhile, Si/C specific value was slightly higher, and there was coarse flake graphite in partial region. These reduced greatly the mechanical properties of control valve body. Under the constant action of external air pressure, brittle fracture of control valve body was caused.

关 键 词：内控制闸阀 材质成分 石墨形态 灰铸铁 脆性断裂 

分 类 号：TG143.2[一般工业技术—材料科学与工程]