| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1582556 | Materials Science and Engineering: A | 2008 | 10 Pages |
The microstructure of cast polycrystalline Inconel 738LC (IN738LC) under different heat treatment conditions was investigated. The cast microstructure of this alloy consists of austenitic γ matrix, γ′ precipitates, MC carbide and γ/γ′ eutectic. The microstructure of the conventional solution treatment, 1120 °C/2 h/accelerated air cooling (AAC), contains a bimodal γ′ precipitate. Solution treatment at several temperatures of 1120, 1180, and 1220 °C for 1.5 h as well as 1180 °C/1.5 h + 1220 °C/2 h has been carried out under argon atmosphere. Accelerated air cooling (AAC) and water quenching (WQ) were applied after solution treatment. Moreover, aging treatment at 845 °C was carried out for all solutioning conditions followed by WQ. Solution treatment at 1180 °C/1.5 h + 1220 °C/2 h gives the best homogeneity for different alloying elements and a uniform size for the fine γ′ precipitates. AAC increases the volume fraction and tends to agglomerate γ′ precipitates compared to WQ.
