Process defects and in situ monitoring methods in metal powder bed fusion: a review

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A review of the as-built SLM Ti-6Al-4V mechanical properties towards achieving fatigue resistant designs (2018, background): “The emergence of various defects during AM of metals has been studied by many researchers and has recently been reviewed by Grasso and Colosimo [23].”
In-situ measurement and monitoring methods for metal powder bed fusion: an updated review (2021, neutral): “Other authors reviewed the literature devoted to in-situ sensing and monitoring methods (Ever-ton et al 2016, Spears and Gold 2016, Grasso and Colosimo 2017), summarising and comparing various possible solutions to make sense of large amounts of data measured layer by layer.”
On the use of spatter signature for in-situ monitoring of Laser Powder Bed Fusion (2017, background): “1 For a more detailed classification and discussion of the literature see [45].”
Review of defects in lattice structures manufactured by powder bed fusion (2019, background): “Residual stresses can cause cracks to form [27], delamination between layers [18] (Fig.”