| Abstract |
| Low temperature δ-precipitation phenomenon below 2-step aging (718℃, 8 hr + 621℃, 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 platelike δ-phase. From the results of the DSC analysis, it was also found that a temperature of δ-precipitation decreases with an increase of the cold drawn ratio. We concluded that cold drawing of inconel 718 wire promotes the δ-precipitation, and under the condition of a high drawing ratio, the δ-phase could be precipitated at a temperature below the aging temperature (718℃). |
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| Key Words |
| Inconel 718, alloys, cold working, precipitation, thermal analysis |
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