A study of the influence of novel scan strategies on residual stress and microstructure of L-shaped LPBF IN718 samples

Process parameters in laser-based powder bed fusion (LBPF) play a vital role the part quality. In current study, influence of different novel scan strategies on residual stress, porosities, microstructure, and crystallographic texture has been investigated for complex L-shape parts made from nickel-based superalloy Inconel 718 (IN718). Four scanning representing total fill, re-melting, two sectional strategies, were using neutron diffraction, imaging, electron microscopy techniques. These results compared with corresponding an sample printed conventional strategy used achieving high density more uniform texture. Among these re-melting yielded approximately 25% reduction surface stress comparison to reference sample. The other revealed porosities at interfaces sections due lower levels also observed. Also, variation was observed strategies.