About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Interactions between Energy and Materials
|
| Presentation Title |
In-Situ Laser surface Remelting of Additive Build Ti6Al4V in Nitrogen Environment for Surface Nitriding |
| Author(s) |
Ankit Porwal, Cheruvu Siva Kumar, Santanu Dhara |
| On-Site Speaker (Planned) |
Ankit Porwal |
| Abstract Scope |
Laser surface remelting was a widely used method for nitriding the surface of titanium and related alloys. The present work establishes a reactive environment of nitrogen (N) gas in the laser additive build chamber for in-situ laser remelting of additively pre-build Ti6Al4V substrate. Surface topography and elemental changes with different laser power and scan speed were studied. Results show an increase in surface roughness with selective laser remelting. Surfaces treated with higher energy density produce higher surface roughness. EDX results show an increase in weight percentage and atomic weight percentage of nitrogen from 1.91\% to 38.81\% and 5.82\% and 65.03\% at the remelted surface, respectively, due to the diffusion of nitrogen in Ti6Al4V during remelting. XRD phase analysis shows the presence of titanium(Ti) and aluminium(Al) nitride peaks and X-ray Photon electron Spectrometry (XPS) also indicates the formation of nitrogen bonds with Ti and Al, which were initially missing in substrates. |