Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti–6Al–4V

By M. Simonelli, Y. Tse, Christopher John Tuck. 2014

922 citations recorded by the source corpus.

Recent research on the additive manufacturing (AM) of Ti alloys has shown that the mechanical properties of the parts are affected by the characteristic microstructure that originates from the AM process. To understand the effect of the microstructure on the tensile properties, selective laser melted (SLM) Ti–6Al–4V samples built in three different orientations were tensile tested. The investigated samples were near fully dense, in two distinct conditions, as-built and stress relieved. It was found that the build orientation affects the tensile properties, and in particular the ductility of the samples. The mechanical anisotropy of the parts was discussed in relation to the crystallographic texture, phase composition and the predominant fracture mechanisms. Fractography and electron backscatter diffraction (EBSD) results indicate that the predominant fracture mechanism is intergranular fracture present along the grain boundaries and thus provide and explain the typical fracture surface features observed in fracture AM Ti–6Al–4V.

Subfields: Automotive Engineering, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/acbda1d5f269a98d1f8f81ef4bab7122ac745e19

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In Automotive Engineering

1. T. Mukherjee
2. T. DebRoy
3. H. Wei
4. A. Fatemi
5. Nima Shamsaei
6. Amitava De
7. N. Phan
8. Wei Zhang

In Materials Chemistry

1. T. Mukherjee
2. A. Fatemi
3. T. DebRoy
4. H. Wei
5. Nima Shamsaei
6. Stefano Beretta
7. R. Molaei
8. N. Phan

In Mechanical Engineering

1. T. DebRoy
2. T. Mukherjee
3. H. Wei
4. Nima Shamsaei
5. A. Fatemi
6. Amitava De
7. N. Phan
8. J. Elmer

Citations in the corpus

• An experimental study of residual stress and direction-dependence of fatigue crack growth behaviour in as-built and stress-relieved selective-laser-melted Ti6Al4V (2019, background): “Tensile residual stresses along the deposition direction can significantly reduce the fatigue strength by decreasing the crack initiation period and increasing the crack growth rate [15,36,37].”
• Qualification of AM parts: Extreme value statistics applied to tomographic measurements (2017, methodology): “Therefore, also the extreme estimates performed on these data result in larger values, and the difference in the HCF resistance between horizontal and vertical samples [2,10,11,47,52-54] is explained.”
• Additive manufacturing of Ti6Al4V alloy: A review (2019, positive): “A similar texture feature of β grains is also observed in SLM fabricated Ti6Al4V [42,51,140,141] and DED built components [75,142–144].”
• Roughness Effects on Flow and Heat Transfer for Additively Manufactured Channels (2015, result): “[3] performed a similar study and observed comparable trends.”