Review of laser powder bed fusion(LPBF)fabricated Ti-6Al-4V:process,post-process treatment,microstructure,and property

Laser powder bed fusion(LPBF)is a timely important additive manufacturing technique that offers many opportunities for fabricating three-dimensional complex shaped components at a high resolution with short lead times.This technique has been extensively employed in manufacturing Ti-6Al-4V parts for aerospace and biomedical applications.However,many challenges,including poor surface quality,porosity,anisotropy in microstructure and property,and difficulty in tailoring microstructure,still exist.In this paper,we review the recent progress in post-process treatment and its influence on the microstructure evolution and material performance,including tensile,fatigue,fracture toughness,creep,and corrosion properties.The contradictions in simultaneously achieving high strength/ductility and strength/fracture toughness/creep resistance have been identified.Furthermore,research gaps in understanding the effects of the emerging bi-modal microstructure on fatigue properties and fracture toughness require further investigation.