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A Study of Manufacturing Techniques Extracting from the Analysis of Corrosion Status and Microstructure for the Cast-Iron Pot in Bubjusa  

Han, Min-Su (Conservation Science Division, National Research Institute of Cultural Heritage)
Kim, So-Jin (Research Institute of Culture Properties, ENGUARD Co. Ltd.)
Hong, Jong-Ouk (Conservation Science Division, National Research Institute of Cultural Heritage)
Publication Information
Journal of Conservation Science / v.26, no.3, 2010 , pp. 269-276 More about this Journal
Abstract
This study aims to extract manufacturing techniques by analysing metallurgical characteristics of the cast-iron pot from Bubjusa, examining corrosion status and microstructure with a optical microscope, SEM-EDS, micro vickers hardness tester and XRD. The microstructure analysis has presented that ferrite and partial portion of pearlite exist within the corroded outer layer. The analysis of the inner layer revealed that there is pearlite and graphite of feather shape. The one of the middle layer, which is placed between outer and inner layer, showed that corrosion has been heavily developed. Micro vickers hardness values range from 217Hv to 698Hv in constituent layers and such values lie within the ranges of the ancient iron relics. The result of EDS analysis for each microstructure presented that the outer layer has been more decarbonized than the inner layer. XRD analysis of iron corrosion compound revealed that Goethite and Hematite had been produced from the corrosive process of iron. The study concludes that the large iron pot was made by casting technique, and microstructure of inner layer had a gray cast iron. Outer layer has been decarbonized through repetitive process of heating and cooling. This results can be used as fundamental data for comparative study to reveal manufacturing techniques of large cast-iron pot.
Keywords
Bubjusa; Cast-iron pot; Microstructure; Corrosion compound; Manufacturing technique; Gray cast iron;
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