Research of the possibility of using an electrical discharge machining metal powder in selective laser melting

Abstract

Research of the possibility of using an electrical discharge machining metal powder in selective laser melting Abstract. In this paper the research of a Ni-20Cr-10Fe-3Ti (heat-resistant) alloy metal powder conducted for use in a selective laser melting technology. This metal powder is the slime after electric discharge machining. The technology of cleaning and melting the powder discussed in this article. As a control input of the powder, immediately before 3D printing, dimensional analysis, surface morphology and the internal structure of the powder particles after the treatment were examined using optical and electron microscopes. The powder granules are round, oval, of different diameters with non-metallic inclusions. The internal structure of the particles is solid with no apparent defects. The content of the required diameter of the total volume of test powder granules was 15%. X-ray fluorescence analysis of the powder materials carried out. The possibility of powder melting was investigated in the selective laser melting machine 'SLM 280HL'. A selection of the melting modes based on the physical properties of the Ni-20Cr-10Fe-3Ti alloy, data obtained from similar studies and a mathematical model of the process. Conclusions on the further investigation of the possibility of using electric discharge machining slime were made.

Suitability of Eroded Particles from Die-Sink Electro Discharge Machining for Additive Manufacturing—Review, Characterization and Processing

“…Particle size distributions for selected references gained from ImageJ analysis. Data from [17,38,46,54,71,73,75]. As highlighted in Figure 2, particles from all PSDs presented would be suitable for AM components.…”

“…Furthermore, different machining settings were used, and sometimes a comparison of changing machining settings was investigated for the same system. Katiyar 2018 [54] Golubeva 2017 [73] König 2007 [17] Storr 2006 [38] Cabanillas 2007 [75] Figure 2. Particle size distributions for selected references gained from ImageJ analysis.…”

“…Sieving processes would result in-minimum-two size fractions, whereby each fraction is suitable for one AM technique. This would make sense in the case of analyzed references (11) [73] or (15) [75].…”

“…al. [73], who tried a printing process of components in an SLM machine, SE_01 shows better properties. Their results were not acceptable because printed parts collapsed and were not stable enough.…”

Chemical polishing of samples obtained by selective laser melting from titanium alloy Ti6Al4V

“…Mechanical machining is not always efficient enough due to the geometric complexity, thin walls, and low removable-stock reserves. Besides, as titanium allows have low thermal conductivity, the mechanical machining of thin parts might result in structural and phase changes inn the material, which generate tensile residual stresses and result in the warpage of parts [7,8].…”