Morphology of technological discontinuities in the structure of additive manufacturing products as a cause of anisotropy of their physical and mechanical properties

Based on the developed method for determining the boundaries of the stress-strain state (VAT) regions and the coordinates of plasticity zones developing in the vicinity of pores in loaded powder products of SLM technology, a hypothesis is proposed and calculations are carried out confirming the influence of pore morphology in powder additive alloys on the anisotropy of their physico-mechanical properties. The influence of the external tensile stress and the possible pressure of gases in the pores is taken into account.
The calculation made it possible to clarify the place of origin, shape and coordinates of the boundary of the development of the plasticity zone (cracking) in the vicinity of a spherical pore, depending on the ratio of external stress and gas pressure in the pores.
The obtained expressions for estimating the size of the plasticity zone can be used to clarify the parameters of the kinetics of the destruction processes of products made of porous steels manufactured using SLM technology under conditions of their stress corrosion.