1, Gr23 titanium alloy forging billet and forgings of ultrasonic acceptance standards are very strict, the requirements of the assessment of the parameters are more, the current acceptance standards of foreign aviation titanium alloy forgings ultrasonic flaw detection, see the list of foreign aviation titanium alloy forgings ultrasonic flaw detection acceptance standards (the highest level).
2, titanium alloy forgings microstructure changes in its mechanical properties have a more significant impact on the ultrasonic flaw detection in the level of stray waves and bottom wave loss assessment to check the uniformity of titanium alloy organization, should be given due attention.
3, titanium alloy materials in ultrasonic flaw detection, sometimes due to a single large grain or local tissue inhomogeneity caused by the tissue reflection will appear in the form of a single reflection signal, easy to confuse with the real metallurgical defects (such as high density inclusions, cracks, holes, etc.) reflection signal, through the experimental analysis that this reflection signal may be due to the ultrasonic reflection of the phase of the superposition of the wave.
The chemical composition of grade 23 Ti 6Al 4V ELI alloy is outlined in the following table.
| Element | Content (%) |
|---|---|
| Titanium, Ti | 88.09 - 91 |
| Aluminum, Al | 5.5 - 6.5 |
| Vanadium, V | 3.5 - 4.5 |
| Iron, Fe | ≤ 0.25 |
| Carbon, C | ≤ 0.080 |
| Nitrogen, N | ≤ 0.030 |
| Hydrogen, H | ≤ 0.0125 |
| Other, each | ≤ 0.10 |
| Other, total | ≤ 0.40 |
Physical Properties
The physical properties of grade 23 Ti 6Al 4V ELI alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 4.43 g/cm3 | 0.160 lb/in3 |
| Melting point | 1604 - 1660°C | 2919 - 3020°F |
