Journal of Conservation Science (보존과학회지)

The Korean Society Of Conservation Science For Cultural Heritage (한국문화재보존과학회)
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A Study on the Metallurgical Characteristics for Sand Iron Ingot Reproduced by the Traditional Iron-making Method on Ancient Period under the Neutron Imaging Analysis

중성자 영상 분석을 활용한 고대 제철법 재현 사철강괴의 금속학적 특성 연구

  • Cho, Sung Mo (Department of Cultural Heritage Conservation Science, Kongju National University) ;
  • Kim, Jong Yul (Neutron Science Center, Korea Atomic Energy Research Institute) ;
  • Sato, Hirotaka (Faculty of Engineering, Hokkaido University) ;
  • Kim, TaeJoo (Neutron Science Center, Korea Atomic Energy Research Institute) ;
  • Cho, Nam Chul (Department of Cultural Heritage Conservation Science, Kongju National University)
  • 조성모 (국립공주대학교 문화재보존과학과) ;
  • 김종열 (한국원자력연구원 중성자과학연구부) ;
  • ;
  • 김태주 (한국원자력연구원 중성자과학연구부) ;
  • 조남철 (국립공주대학교 문화재보존과학과)
  • Received : 2019.10.20
  • Accepted : 2019.12.10
  • Published : 2019.12.20
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Abstract

The purpose of this study was to compare analytical results of sand iron bars reproduced by the traditional iron-making method through a destructive analysis and a non-destructive analysis. For these studies, we produced two types of samples. One was sample(SI-A), a part of the sand iron bar for destructive analysis. The other was SI-B(9 ㎠) for non-destructive analysis. A metallurgical microscope and scanning electron microscope were used for the destructive analysis, and neutron imaging analysis with the Hokkaido University Neutron Source (HUNS) at Hokkaido University, Japan, was used for the non-destructive analysis. The results obtained by destructive analysis showed that there was ferrite and pearlite of fine crystallite size, and some of these showed Widmanstätten ferrite microstructure grown within the pearlite and coarse ferrite at the edge of the specimen. The results from the neutron imaging analysis showed that there was also ferrite and pearlite with 3 ㎛ α-Fe of BCC structure. Based on these results, neutron imaging analysis is capable of identifying material characteristics without destroying the object and obtaining optimal research results when applying it to objects of cultural heritage.

본 연구는 전통제철법인 정련 및 단접을 적용한 사철강괴(SI)의 미세조직을 파괴분석법인 현미경분석과 비파괴분석법인 중성자 영상 분석을 통해 분석결과를 비교하였다. 시료는 전통제철법으로 생산한 사철강괴이며, 파괴분석용의 SI-A와 비파괴분석용의 9 ㎠의 SI-B를 제작하였다. 파괴분석으로 금속현미경과 주사전자현미경이 이용되었으며, 비파괴분석으로 일본 훗카이도 대학의 소형 중성자원 이용시설을 통한 중성자 영상 분석을 이용하였다. 파괴분석결과 미세한 ferrite 및 pearlite가, 시료의 가장자리에서 Widmanstätten ferrite와 조대한 ferrite가 관찰되었다. 또한 비파괴분석법인 중성자 영상 분석 결과 체심입방격자 구조의 grain size가 3 ㎛ 정도의 α-Fe인 ferrite와 층상의 pearlite가 관찰되었다. 이렇듯 중성자 영상 분석을 이용하면 비파괴로 연구대상의 재료과학적 특성을 확인할 수 있고 문화재에 적용 시 최적의 연구결과를 얻을 수 있음을 확인하였다.

Keywords

References

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