Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Low Temperature δ-Precipitation of Inconel 718 Alloy Wire during Cold Drawing

인코넬 718합금 선재의 냉간 인발시 δ 상 저온 석출 현상 연구

  • Park, Jae Man (Department of Materials Science and Engineering, Pusan National University) ;
  • Kim, Yong Hwan (Department of Materials Science and Engineering, Pusan National University) ;
  • Jang, Heui Un (Department of Materials Science and Engineering, Pusan National University) ;
  • Chung, Won Sub (Department of Materials Science and Engineering, Pusan National University)
  • Received : 2012.03.06
  • Published : 2012.07.25
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Abstract

Low temperature ${\delta}$-precipitation phenomenon below 2-step aging ($718^{\circ}C$, $8hr+621^{\circ}C$, 8 hr) temperature of cold drawn Inconel 718 alloy wire was investigated. The investigation was carried out on wires with a cold drawn ratio of 0, 20, 50 and 70% using OM, SEM, XRD, TEM, and DSC. In microstructures of 50 and 70% drawn wire, many precipitates were found along the grain boundaries and the twin boundaries in deformation band. From the results of the XRD and TEM analysis, the precipitates were identified as plate-like ${\delta}$-phase. From the results of the DSC analysis, it was also found that a temperature of ${\delta}$-precipitation decreases with an increase of the cold drawn ratio. We concluded that cold drawing of inconel 718 wire promotes the ${\delta}$-precipitation, and under the condition of a high drawing ratio, the ${\delta}$-phase could be precipitated at a temperature below the aging temperature ($718^{\circ}C$).

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