Influence of Scanning Strategy Parameters on Residual Stress in the SLM Process According to the Bridge Curvature Method for AISI 316L Stainless Steel

The present paper deals with the investigation and comparison of the influence of scanning strategy on residual stress in the selective laser melting (SLM) process. For the purpose of the experiment, bridge geometry samples were printed by a 3D metal printer, which exhibited tension after cutting from the substrate, slightly bending the samples toward the laser melting direction. Samples were produced with the variation of process parameters and with a change in scanning strategy which plays a major role in stress generation. It was evaluated using the Bridge Curvature Method (BCM) and optical microscopy. At the end, a recommendation was made.

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Improved tribological performance of AISI 316L stainless steel by a combined surface treatment: Surface texturing by selective laser melting and plasma nitriding

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2020.126178 ◽

2020 ◽

Vol 400 ◽

pp. 126178 ◽

Cited By ~ 3

Author(s):

H. Kovacı ◽

Y. Seçer

Keyword(s):

Stainless Steel ◽

Surface Treatment ◽

Selective Laser Melting ◽

316L Stainless Steel ◽

Plasma Nitriding ◽

Surface Texturing ◽

Tribological Performance ◽

Aisi 316L ◽

Laser Melting ◽

Aisi 316L Stainless Steel

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Microstructure and Mechanical Properties of Electron Beam Deposits of AISI 316L Stainless Steel

Volume 3: Design and Manufacturing ◽

10.1115/imece2011-62445 ◽

2011 ◽

Cited By ~ 3

Author(s):

Liang Wang ◽

Sergio D. Felicelli ◽

Jacob Coleman ◽

Rene Johnson ◽

Karen M. B. Taminger ◽

...

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Electron Beam ◽

Process Parameters ◽

316L Stainless Steel ◽

Beam Current ◽

Aisi 316L ◽

Translation Speed ◽

Aisi 316L Stainless Steel ◽

Microstructure And Mechanical Properties

Electron beam freeform fabrication (EBF3) is a process that uses an electron beam and wire feedstock to fabricate metallic parts inside a vacuum chamber. In this study, single and multiple layer linear deposits of AISI 316L stainless steel were produced with the EBF3 machine at NASA Langley Research Center (LaRC). EBF3 process parameters, including beam current, translation speed, and wire feed rate, were investigated in order to consider their effects on the resulting steel deposit geometry, microstructure and mechanical properties. Results indicate that the EBF3 process can produce pore-free, fully dense material within the range of process parameters used in this study. The electron beam deposited stainless steel has a solidification microstructure with fine columnar grains within most parts of the deposit due to the high cooling rate during the deposition, with some small homogeneous equiaxed grains at the top of the deposit. The mechanical properties of the deposits are comparable to those of wrought metal, which is attributed to the homogeneous fine-grained microstructure.

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