김포 양촌유적 출토 원삼국시대 철부에 적용된 제작기술 검토
Study on the Manufacturing Technology Applied on Iron Axes of Proto-Three Kingdoms excavated from Yangchon, Gimpo
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초록
원삼국시대에 속하는 경기도 김포시 양촌유적에서 출토된 단조철부 5점과 주조철부 1점을 대상으로 미세조직 관찰과 비금속개재물 분석을 실시하였다. 단조품에 사용된 소재는 순철에 가까운 소재와 저탄소강이 사용되었고 성형 후 1점에만 담금질을 하였다. 주조품은 주철을 탈탄시킨 미세조직이 보여 주철탈탄 제강법이 적용된 것을 확인하였다. 비금속개재물 분석 결과 철부는 고체저온환원법으로 제련하여 생산된 괴련철을 두드려서 제작하였다. FeO 함량이 SiO2에 비해 비교적 높게 나타나 제련 시 노의 온도가 환원에 충분하지 못해 Fe의 회수율이 적었던 것으로 보이며 이 과정에서 광물에 포함된 K, P, Mg, Mn, Ti 등 불순물이 혼입되었다. Ca 함량이 높게 검출되는 곳이 있어 일부는 조제제로 석회물질을 넣었던 것으로 추정된다.
Abstract
Microstructures and nonmetallic inclusions of five forged iron axes and one cast iron axe were analyzed. The axes were excavated from the Proto-Three Kingdom Period site located in Yangchon, Gimpo. The forging objects were made of almost pure iron and low carbon steel, and only one among five were quenched after its figuration. Malleable cast iron structures showing on the casting suggest that the decarbonized casting method were applied. According to the results of nonmetallic inclusion analysis, the axes were produced by hammering the iron bloom which was attained with low-temperature -solid-reduction-method. Showing higher Fe content over SiO2, it is assumed that the re-collecting rate of Fe was low because of the insufficient forging temperature and the impurities were included during the smelting process. It is assumed that the lime was used as a preparation because of detecting high Ca contents.
참고문헌 (14)
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