Influence of Mechanical Anisotropies on the Machinability of an Additively Manufactured Stainless Steel (1.4404)

6 Pages Posted: 1 Oct 2021

See all articles by Ante Glavas

Ante Glavas

Rheinische Fachhochschule Köln

Benedikt Thimm

Rheinische Fachhochschule Köln

Date Written: December 1, 2021

Abstract

Additive manufacturing methods like Laser Powder Bed Fusion (L-PBF) offer great geometrical design flexibility. Until now, L-PBF manufactured parts need post-process operations like machining to meet the demands of surface quality and dimensional accuracy of most applications. Due to the layer-by-layer methodology during the building process, mechanical anisotropies can develop in the part. These can have a significant effect on the chip formation depending on the direction of material removal. The aim of this work is to contribute to the understanding of the influence of anisotropies on the machinability of stainless-steel samples (material no.: 1.4404) manufactured by L-PBF. Using linear-orthogonal cutting tests, fundamentals of the chip formation are observed in dependence of L-PBF-parts manufactured with different process parameters. Variations include layer thickness and part orientation during the L-PBF process. Especially the part orientation is of great importance as it has a significant impact on the mechanical anisotropy. The experiments were carried out at different cutting conditions. To understand the results, focus is mainly given to the cutting and feed forces as well as the chip thickness values. The experimental results are supplemented with analytical analyses to understand the influence of part orientation and layer thickness in more detail.

Keywords: Additive manufacturing; Laser Powder Bed Fusion; Mechanical anisotropy; Part orientation; Layer thickness; Cutting process; Linear-orthogonal cutting; Process forces; Chip thickness

Suggested Citation

Glavas, Ante and Thimm, Benedikt, Influence of Mechanical Anisotropies on the Machinability of an Additively Manufactured Stainless Steel (1.4404) (December 1, 2021). Proceedings of the Machining Innovations Conference for Aerospace Industry (MIC) 2021, Available at SSRN: https://ssrn.com/abstract=3934336 or http://dx.doi.org/10.2139/ssrn.3934336

Ante Glavas (Contact Author)

Rheinische Fachhochschule Köln ( email )

Vogelsangerstr. 295
Köln, Nordrhein-Westfalen 50825
Germany

Benedikt Thimm

Rheinische Fachhochschule Köln ( email )

Schavenstr. 1a-b
Köln, Nordrhein-Westfalen 56776
Germany

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