• Title/Summary/Keyword: 열처리기술

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A Study of Cast Ironware Heat Treatment Technique in Ancient Korea (고대 한반도 주조철기 열처리 기술에 대한 고찰)

  • Choi, Yeongmin
    • Korean Journal of Heritage: History & Science
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    • v.53 no.1
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    • pp.168-183
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    • 2020

  • Efforts had been made to eliminate the brittleness unique to cast ironware from 5 BC up until the time that cast ironware became widely used. One of the techniques used to this end was to produce the cast ironware in one kiln and then anneal it in another kiln. This technique condensed or removed the carbon in the structure to eliminate the brittleness of cast ironware and enable forging. To clarify the nature of this technique, this study examined cast ironware made of malleable cast iron, which manifests the characteristics of the annealing technique for cast ironware excavated on the Korean peninsula, based on current steelmaking technology and research results from China and Japan. Results confirmed that all cast ironware made of malleable cast iron had been imported into Korea until the Proto-Three Kingdoms Period. Also, since the Chiljido (Seven-Branched Sword), which is housed at the Ishigami Shrine in Japan, appears to have been produced in the Korean peninsula, it is determined that Baekje in the 4th century must have possessed such an annealing technique. At that time, however, iron was produced mainly with an iron bloom, and a large amount of forged iron was produced with a steel bloom smelted from an iron bloom. In addition, most of the cast ironware that was used previously, except for cast iron hoes, had been replaced by forged ironware. In other words, this annealing technique was not used frequently until the Three Kingdoms Period. However, it spread broadly during the Unified Silla Period in so much as it was identified in the Jangan-ri remains, which represented the regional hub of iron production and distribution.

  • https://doi.org/10.22755/kjchs.2020.53.1.168 인용 PDF

Effect of De-graphitization Heat Treatment on Interfacial Bonding Properties of Flake Graphite Cast Iron-Aluminum Dissimilar Materials Produced by High Pressure Die Casting (고압 다이캐스팅법으로 제조한 편상흑연주철 -알루미늄 이종소재의 계면접합특성에 미치는 탈흑연 열처리의 영향)

  • Yang, Ji-Ba-Reum;Kim, TaeHyeong;Jeong, JaeHeon;Kim, SangWoo;Kim, YoonJun;Kim, DongEung;Shin, JeSik
    • Journal of Korea Foundry Society
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    • v.41 no.6
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    • pp.535-542
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    • 2021

  • In this study, to improve the interfacial bond strength of cast iron-aluminum dissimilar materials, graphite was removed to a certain depth from the cast iron surface through de-graphitization heat treatment. As the heat treatment time increased, the depth at which graphite was removed increased, showing a linear relationship between the heat treatment time and depth. Aluminum was filled to a certain depth on the de-graphitized cast iron surface through die-casting method, and no intermetallic compounds were formed on the cast iron-aluminum interface. The interfacial bonding strength showed a value of 90 MPa regardless of the heat treatment time, which is very high compared to the 12MPa bonding strength of the material without de-graphitization heat treatment. This result is thought to be due to the mechanical bonding of the undercut structure as the liquid aluminum, penetrated by the high pressure die-casting process, solidified in the de-graphitized region of the cast iron.

  • https://doi.org/10.7777/jkfs.2021.41.6.535 인용 PDF KSCI HTML