About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Exploiting Principles of Physical Metallurgy for the Optimization of Processing of Titanium Alloys for Structural Applications |
| Author(s) |
Brian A. Welk, Gopal Babu Viswanathan, Paraic O'Kelly, Hamish L. Fraser |
| On-Site Speaker (Planned) |
Hamish L. Fraser |
| Abstract Scope |
This paper describes ways in which aspects of physical metallurgy may impact additive manufacturing (AM) and hot isostatic pressing (HIP) of titanium alloys for structural applications. Regarding the application of AM, the problem associated with AM of titanium alloys in which commonly the as-processed microstructures are characterized by coarse columnar solidification. Attractive microstructures are produced by making use of dilute additions of alloying elements which increase the degree of undercooling achieved prior to nucleation of the solidified alloy. The aim of HIP’ing titanium alloys involves fabrication of relatively large titanium products that are net shape, are free from residual stresses, possess uniform microstructures (e.g., no MTR’s or MZ’s), and have considerable strength. It will be shown that this aim has been achieved. Thus, attractive combinations of properties are developed by use of this processing approach and through heat-treatment (which can also be achieved using quenching during the HIP cycle). |