Effect of the scanning strategy on the formation of residual stresses in additively manufactured Ti-6Al-4V

摘要: Abstract During the laser-powder bed fusion (L-PBF) process, high laser intensities, short interaction times and highly localized heat input drive large thermal gradients that result in a state of residual stresses. Generally, stresses develop during L-PBF process can compromise performance component. Up to now, literature has indicated magnitude be affected by various parameters. In this study, all parameters such as power speed are held fixed focus is solely on effect scan strategy three-dimensional stress metallic components. Four Ti-6Al-4V bridge shaped components were built using island continuous scanning patterns parallel offset 45° from sample axes. High-energy X-ray diffraction was used determine field each Two them re-measured after being partially removed build plate. The assumptions implicit measurements reviewed discussed depth because unique microstructure associated with renders validity those uncertain. Specifically, additional data collected analysed evaluate relationship between grain scale macroscopic observed large, ½ ¾ yield strength, particularly direction near lateral edges bridges. work, higher bridges via strategies, chiefly parts.