Effects of defects on axial fatigue strength of steel samples and supports produced by additive manufacturing

Many materials such as steel, aluminium and titanium alloys can be realised by powder bed solutions, melting subsequently powder layers utilizing laser or electron beam (Laser Beam Melting LBM and Electron Beam Melting EBM). The microstructure is realised by layer-by-layer solidification. Having a high cooling rate cannot be considered isotropic. Therefore, the mechanical properties could be influenced by the building direction. Regarding maraging steel, the study of the influence of the building direction and the heat treatment on the static and axial fatigue strength has been investigated in a previous contribution. A large scatter of the fatigue test results was found because of the presence of detrimental and subsurface defects. This contribution aims to present additional axial fatigue-test results of maraging steel characterized by different build orientations and provide an analysis of the defects observed at the crack initiation area of the fracture surface.

کلیدواژه ها:

Effects ، defects ، Fatigue ، Strength ، supports