Abstract
A step-bar model is developed and used to investigate the effects of grain-size gradients, geometrical irregularities and deformation rates on the necking of Ti-6Al-4V at 927 degreesC. A necking map, which indicates the necking mode for a range of deformation rates under various initial cross-sectional area and grain-size combinations, is obtained. Finite-element simulations of a superplastic gas-blow forming process are carried out to investigate the effects of initial grain-size distributions on the non-uniform thinning of a formed structural component. The effects of grain sizes on the gas-pressure history required to maintain a forming rate is also studied. (C) 2002 Elsevier Science B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 10-18 |
| Number of pages | 9 |
| Journal | Journal of Materials Processing Technology |
| Volume | 134 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Mar 2003 |
Keywords
- superplasticity
- necking
- gas-blow forming
- grain-size evolution