Akademik Veri Yönetim Sistemi
The 34th Annual International Solid Freedom Fabrication Symposium, Texas, Amerika Birleşik Devletleri, 14 - 16 Ağustos 2023, ss.74, (Özet Bildiri)
The Laser Powder Bed Fusion (LPBF) process generates high-temperature gradients within a build due to the rapidly traversing high-intensity laser beam. These temperature gradients and rapid solidification rates can increase component residual stress and limit the type of microstructure that can be formed. This research aims to investigate the use of a de-focused 140W 915 Nm diode laser with beam shaping optics to pre-heat an area of 150 mm2 between 150C and 750C. It was found that using laser pre-heating reduced the cooling rate of the LPBF melt pool, cracks could be prohibited, residual stresses were decreased and Ti6Al4V microstructure and mechanical properties improved.