In-situ residual stress reduction, martensitic decomposition and mechanical properties enhancement through high temperature powder bed pre-heating of Selective Laser Melted Ti6Al4V

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 695; pp. 211 - 220
• Main Authors: Ali, Haider, Ma, Le, Ghadbeigi, Hassan, Mumtaz, Kamran
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 17.05.2017; Elsevier BV
• Subjects: Additive Manufacturing; Decomposition; Deformation; Deformation mechanisms; Ductility; Elastic deformation; Elongation; Heat treatment; Hot working; Laser beam heating; Laser beam melting; Mechanical properties; Microstructure; Powder bed pre-heating; Process heat; Residual stress; Selective Laser Melting; Temperature gradients; Ti6Al4V; Titanium base alloys; Yield strength; Yield stress; Mechanical properties; Additive Manufacturing; Selective Laser Melting; Ti6Al4V; Residual stress; Powder bed pre-heating

During the Selective Laser Melting (SLM) process large temperature gradients can form, generating a mismatch in elastic deformation that can lead to high levels of residual stress within the additively manufactured metallic structure. Rapid melt pool solidification causes SLM processed Ti6Al4V to fo...