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Mechanical Behavior of Additive Manufacturing (AM) and Wrought Ti6Al4V with a Martensitic Microstructure

Ricci, Sara;
2024-01-01
2024
Processing and microstructure are fundamental in shaping material behavior and failure characteristics. Additively manufactured materials
due to the rapid heating and solidification process
exhibit unique microstructures compared to their as-cast counterparts
resulting in distinct material properties. In this work
the response of the titanium alloy Ti6Al4V has been investigated for different processing conditions through quasi-static testing. AM Ti6Al4V was fabricated by employing Selective Laser Sintering (SLS) and Selective Laser Melting (SLM) techniques. Both materials present a similar microstructure consisting of an acicular martensitic a′ -phase. Commercial Ti6Al4V-grade 5 (supplied as bars) was also examined after heat treatment to achieve a microstructure akin to the AM material. The heat treatment involved rapid heating above the b-phase region and water quenching to obtain a full martensite microstructure. A similar constitutive behavior and tensile–compressive asymmetry in strength were noted for the investigated materials. However
AM alloys exhibited a significantly higher deformation at failure
reaching nearly 40%
compared to only 6.1% for the wrought martensitic material
which can be attributed to the dissimilar distribution of both a′ laths and prior-b grain boundaries in the investigated materials. The results indicate that AM can be implemented for the fabrication of martensitic microstructures with mechanical properties superior to those obtained with conventional water-quenching
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12606/48067
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