An Improved non-destructive replication metallography method for investigation of the precipitates in Cr-Mo-V turbine steel

作者：He Yinsheng; Dong Jiling; Choi Woosung; Jung Jinesung; Shin Keesam^*

来源：Surface and Interface Analysis, 2012, 44(11-12): 1411-1414.

DOI：10.1002/sia.4958

• Cr-Mo-V steel
• precipitates
• carbon replication
• non-destructive replica (NDR)

An improved non-destructive replication (NDR) metallography method was developed and applied successfully for the precipitates study in 1Cr-1Mo-0.25V turbine rotor steel. The preparation of the replicas for electron microscopy was carried out with a combination of electropolishing, etching, and acetate film setting for extraction medium. The exposure of the precipitates was improved by electropolishing followed by chemical etching. The electropolishing after application of acetate film, instead of stripping, resulted in a quality improvement of the extraction replica. Three types of precipitates (M23C6, Mo2C, and VC) were identified by TEM analysis of thin foil. The types, sizes, and chemical compositions of the precipitates from the bulk SEM observation and TEM analyses of thin foil specimen and the NDR extraction replica matched very well, indicating NDR extracted all types of the precipitates with high efficiency.

• 出版日期2012-12
• 单位重庆大学