“云斑”偏析(或称组织分层)是离心铸造大中型厚壁汽缸套常见的缺陷之一,严重地影响着汽缸套的质量和使用性能。六机部于一九七九年下达了离心铸造大中型厚壁汽缸套“云斑”偏析机理及其控制的研究任务,由沪东造船厂和六机部十二所共同承担。在六机部科 The “cloud spot” segregation (or tissue stratification) is one of the common defects of centrifugal casting large and medium-sized thick-walled cylinder liner, seriously affecting the cylinder liner quality and performance. In 1960, the Six Machinery Department issued the research mission of “cloud spot” segregation mechanism and control of large and medium-sized thick-walled cylinder liner by centrifugal casting. It is jointly undertaken by twelve Hudong Shipyard and six machinery department. In the six machine department