Influence of SLM Process Parameters on Porosity of Nickel Base Heat Resistance Alloy EP648

Abstract

In this research EP648 nickel base heat resistance alloy was used for Selective Laser Melting (SLM). This alloy can be used for producing details at high mechanical and thermal load by SLM for aerospace, automotive, shipbuilding and energy industries. To define the influence of SLM process parameters on EP648 4x4x4 mm cubic specimens were fabricated with different process parameters (scanning speed, laser power, layer thickness). The porosity of fabricated specimens was determined by scanning electron microscopy of polished cross-sections.

Investigation on Process Stability and Part Positioning Influence on the Relative Density of Designed Materials via Laser‐Based Powder Bed Fusion of Metals on a Multi‐Laser Machine

“…For the overall tolerance RD tol , Equation ( 13) then result from the addition of Equation ( 11) and (12), and the relative density at 0 LDA RD 0°.…”

“…[1] Next to geometrical defined drillings or lattice structures, process adaptions form an approach for producing open-porous media by PBF-LB/M. [7][8][9][10][11][12][13][14][15][16][17][18] The concept of designed materials (DMs) is based on manipulating the standard PBF-LB/M process to create open-porous structures. [7][8][9][10][11][12][13][14][15][16][17][18] This can be achieved by either adapting powder stock or process parameters.…”

“…[7][8][9][10][11][12][13][14][15][16][17][18] The concept of designed materials (DMs) is based on manipulating the standard PBF-LB/M process to create open-porous structures. [7][8][9][10][11][12][13][14][15][16][17][18] This can be achieved by either adapting powder stock or process parameters. [7][8][9][10][11][12][13][14][15][16][17][18] Additives can be used to establish open-porous structures in the PBF-LB/M process.…”

Pre‐Print‐Prediction of Morphological Properties for Designed Materials Manufactured via Laser‐Based Powder Bed Fusion of Metals on a Multi‐Laser Machine

“…[2,3,8,9] Process adaptations-either modifying the powder feedstock, or process and machine parameters-can be used to provoke randomly distributed porosity into PBF-LB/M components. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] For the approach of process parameter adaptions, the formation of pores is driven by the controlled introduction of defects, e.g., lack of fusion. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] In two previous studies so-called designed materials (DMs) were produced from the nickel-based superalloy Haynes 282 -UNS N07208 ).…”

“…[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] For the approach of process parameter adaptions, the formation of pores is driven by the controlled introduction of defects, e.g., lack of fusion. [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] In two previous studies so-called designed materials (DMs) were produced from the nickel-based superalloy Haynes 282 -UNS N07208 ). [9,22,26] Their open porosity was fabricated by lowering laser power, increasing scan speed, hatch distance, or layer thickness in comparison to a standard process parameter set.…”