Increasing the Productivity of Laser Powder Bed Fusion for Stainless Steel 316L through Increased Layer Thickness

Leicht, Alexander,1987Chalmers tekniska högskola,Chalmers University of Technology (författare)

Additive manufacturing (AM) is able to generate parts of a quality comparable to those produced through conventional manufacturing, but most of the AM processes are associated with low build speeds, which reduce the overall productivity. This paper evaluates how increasing the powder layer thickness from 20 µm to 80 µm affects the build speed, microstructure and mechanical properties of stainless steel 316L parts that are produced using laser powder bed fusion. A detailed microstructure characterization was performed using scanning electron microscopy, electron backscatter diffraction, and x-ray powder diffraction in conjunction with tensile testing. The results suggest that parts can be fabricated four times faster with tensile strengths comparable to those obtained using standard process parameters. In either case, nominal relative density of > 99.9% is obtained but with the 80 µm layer thickness presenting some lack of fusion defects, which resulted in a reduced elongation to fracture. Still, acceptable yield strength and ultimate tensile strength values of 464 MPa and 605 MPa were obtained, and the average elongation to fracture was 44%, indicating that desirable properties can be achieved.

Fischer, Marie,1991Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mariefi (författare)
Klement, Uta,1962Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)uk (författare)
Nyborg, Lars,1958Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)nyborg (författare)
Hryha, Eduard,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)hryha (författare)
Chalmers tekniska högskola (creator_code:org_t)

Ingår i:Journal of Materials Engineering and Performance: Springer Science and Business Media LLC30:1, s. 575-5841059-94951544-1024

Av författaren/redakt...: Leicht, Alexande ...; Fischer, Marie, ...; Klement, Uta, 19 ...; Nyborg, Lars, 19 ...; Hryha, Eduard, 1 ...

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