Table 5.
Chemical composition of Nb-rich precipitates in castings, at%.
| Element | Ni | Nb | Cr | Co | Ta | Al | Ti | Ni/Nb | Nb/Ta | |
|---|---|---|---|---|---|---|---|---|---|---|
| Inconel 740 variant | A1 | 39.3 (±3.0) | 15.8 (±2.1) | 15.4 (±1.9) | 17.2 (±1.1) | 5.1 (±2.0) | 2.0 (±0.5) | 5.1 (±0.9) | 2.9 (±0.6) | 3.3 (±0.8) |
| A2 | 37.2 (±0.5) | 17.3 (±0.6) | 15.1 (±0.1) | 17.4 (±0.2) | 5.7 (±0.3) | 2.4 (±0.3) | 4.9 (±0.2) | 2.1 (±0.1) | 3.3 (±0.3) | |
| A3 | 37.0 (±1.5) | 15.2 (±1.6) | 16.4 (±1.2) | 17.5 (±0.4) | 6.3 (±0.5) | 2.7 (±0.8) | 5.0 (±0.5) | 2.5 (±0.3) | 2.4 (±0.2) | |
| A4 | 35.1 (±1.4) | 17.2 (±1.2) | 17.1 (±0.6) | 17.5 (±0.4) | 3.7 (±1.7) | 3.3 (±0.2) | 6.1 (±0.9) | 1.8 (±0.2) | 3.4 (±1.0) | |
| A5 | 34.6 (±1.0) | 17.5 (±0.4) | 16.4 (±0.3) | 17.3 (±0.4) | 5.2 (±0.3) | 4.0 (±0.9) | 5.1 (±0.3) | 2.0 (±0.1) | 3.3 (±0.2) | |
| A6 | 36.5 (±1.1) | 15.7 (±0.9) | 15.9 (±0.4) | 17.9 (±0.4) | 6.9 (±0.6) | 2.5 (±0.7) | 4.7 (±0.3) | 2.3 (±0.2) | 2.3 (±0.4) | |
| A7 | 30.2 (±0.9) | 19.1 (±0.4) | 19.5 (±0.3) | 18.2 (±0.5) | 4.1 (±0.3) | 4.2 (±0.2) | 4.7 (±0.5) | 1.6 (±0.1) | 4.7 (±0.3) | |
| A8 | 29.5 (±0.7) | 17.2 (±0.3) | 19.7 (±0.6) | 18.3 (±0.5) | 7.5 (±2.2) | 3.8 (±0.7) | 3.8 (±0.3) | 2.1 (±0.1) | 2.4 (±0.6) | |
| A9 | 29.1 (±0.8) | 16.7 (±0.7) | 19.6 (±1.1) | 18.0 (±0.9) | 8.7 (±2.5) | 4.3 (±0.6) | 3.5 (±0.3) | 1.7 (±0.1) | 2.0 (±0.5) | |