About this Abstract |
| Meeting |
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
|
| Symposium
|
11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
|
| Presentation Title |
Laser Powder Bed Fusion of Group VI Transition Metals |
| Author(s) |
Mathieu Brochu, Tejas Ramakrishnan, Sunyong Kwon, Pierre Hudon |
| On-Site Speaker (Planned) |
Mathieu Brochu |
| Abstract Scope |
Group VI transition metals that are including chromium, molybdenum and tungsten are known for their exceptional strength, high melting points (refractory properties), and resistance to corrosion. These metals possess a BCC crystal structure, thus a ductile to brittle transition temperature, low interstitial solubility and susceptibility to grain boundary (GB) oxide brittleness. These materials-based characteristics are making these metals challenging to be processed by laser powder bed fusion (LPBF). This presentation will compare the LPBF behavior of these metals when processed in argon, nitrogen or argon/nitrogen gas mixture environments. The samples produced in argon exhibited important grain boundary cracking. On the other hand, the samples processed in nitrogen were crack free. The gas mixture campaign identified the threshold in nitrogen required to eliminate the cracking. Density functional theory calculations were used to explain the effect of printing gas environment. |
| Proceedings Inclusion? |
Undecided |