| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Purveyors of Processing Science and ICME: A SMD Symposium to Honor the Many Contributions of Taylan Altan, Wei Tsu Wu, Soo-Ik Oh, and Lee Semiatin
|
| Presentation Title |
Manipulation of Microstructure and Microstructural Gradients through Dehydrogenation of Hydrogen-sintered Ti-6Al-4V |
| Author(s) |
Matthew Dunstan, James D Paramore, Z. Zak Fang, Pei Sun |
| On-Site Speaker (Planned) |
Matthew Dunstan |
| Abstract Scope |
In recent years, the powder metallurgy process known as hydrogen sintering and phase transformation (HSPT) has been employed to produce Ti-6Al-4V with mechanical properties that outperform traditional inert/vacuum sintered Ti-6Al-4V and compete with wrought processing. During HSPT processing, hydrogen is used as a temporary alloying element to improve densification and force phase transformations to occur, resulting in high relative density (>98%) and an ultra-fine grained microstructure. As part of hydrogen processing, residual hydrogen must be removed through a vacuum annealing step (known as dehydrogenation) to prevent the embrittling effects of excess hydrogen. In this work, dehydrogenation is shown to be a viable method to further manipulate the microstructure, thus producing a wider range of mechanical properties. Furthermore, by taking advantage of the β stabilizing effects of hydrogen, a functionally graded microstructure can be produced with an ultra-fine grained surface microstructure and a coarse-grained interior microstructure. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |