Brecht Van Hooreweder, David Moens, Rene Boonen, Jean-Pierre Kruth and Paul Sas Analysis of Fracture Toughness and Crack Propagation of Ti6Al4V Produced by Selective Laser Melting Advanced Engineering Materials 14
A distinctive difference in phase morphology and texture of the microstructure is noticed between the selective laser molten (SLM) and vacuum arc remelted (VAR) Ti6Al4V. The fine acicular martensite phase of the SLM-Ti results in more brittle behavior and inferior fracture toughness. On the other hand, the fine grained microstructure leads to a large number of grain boundaries acting as obstacle points for crack propagation, leading to acceptable crack growth rates.
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