Effect of hot rolling on structure and mechanical properties of Ti-6Al-4V alloy parts produced by direct laser deposition

• Published in: International journal of advanced manufacturing technology 2020-03, Vol.107 (3-4), p.1595-1603
• Main Authors: Sokolov, P., Aleshchenko, A., Koshmin, A., Cheverikin, V., Petrovskiy, P., Travyanov, A., Sova, A.
• Format: Article
• Language: English
• Subjects: Additive manufacturing; CAE) and Design; Computer-Aided Engineering (CAD; Elongation; Engineering; Hot rolling; Industrial and Production Engineering; Laser deposition; Lasers; Mechanical Engineering; Mechanical properties; Media Management; Original Article; Porosity; Production methods; Tensile properties; Titanium alloys; Titanium base alloys
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-020-05132-0

Direct laser deposition is an additive manufacturing method capable of producing large-scale titanium alloy parts. In this work, hot rolling process was applied to reduce the porosity and improve the tensile properties of Ti6Al4V parts produced by direct laser deposition additive manufacturing. The hot rolling performed at 950 °C in ambient atmosphere with 10% deformation per pass was found to significantly enhance the mechanical properties. The measured ultimate tensile strengths of the as-built and hot-rolled samples were ~ 850 and ~ 915 MPa, respectively. The elongation at break also increased, from 8.5 to ~ 15%. The total porosity volume was also decreased from 0.09 to 0.003%. Further increase of the accumulated strain up to 47% did not affect significantly the tensile properties.