Abstract
Crack initiation and propagation behavior and mechanism of Ti-6Al-3Mo-1.5Zr-0.3Si titanium alloy in the process of deformation were studied. The compression experiments of the alloy specimen with shear band which had been formed during forging were carried out. The evolution of α+β structure in the compression deformation was examined. The different crack initiation and extension mechanism were observed under the different deformation conditions of forging and compression. The results show that the crack is initiated from alloy specimen surface and propagates by double slip mechanism in the process of forging, and the crack is nucleated in the shear band and propagates by re-nucleation mechanism for compression deformation. It is found that the shear band and severe deformation band formed during plastic deformation are different. The severe deformation band has little influence on the mechanical properties of the alloy, and the shear band is crack tip plastic zone, promoting crack initiation.
| Original language | English |
|---|---|
| Pages (from-to) | 56-61 |
| Number of pages | 6 |
| Journal | Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment |
| Volume | 36 |
| Issue number | 1 |
| State | Published - 25 Jan 2015 |
Keywords
- Crack initiation
- Crack propagation
- Damage mechanism
- Shear band