Evolution of porosity depending on SLM mode and subsequent HIP processing

Abstract

In this work, we obtained the results of studying the effect of pore formation on the energy density deposited in the SLM process, as well as the effect of post-processing on the change in the nature of the pores. To study the porosity formed during the manufacture of parts by the SLM method, groups of primitive specimens were prepared and subjected to HIP processing. Pore formation was investigated by two methods: by optical microscopy and by weighing samples with subsequent calculations of density and porosity values. During the study of the initial samples, 4 types of pores were identified. Pore formation was investigated before and after HIP treatment. The dependence of pore formation on energy density is obtained.

Titanium Alloy Implants with Lattice Structures for Mandibular Reconstruction

“…Gas pores are the smallest internal defects typically seen in SLM constructs. These pores are usually spherical in shape and smaller in size (<100 µm) when compared to the other two kinds of internal defects discussed above [ 225 ]. Gas pores are known to occur during the evolution of the melt pool, when it is largely unstable and gas from the environment gets entrapped [ 226 ].…”