Effect of Surface Sandblasting and Turning on Compressive Strength of Thin 316L Stainless Steel Shells Produced by Laser Powder Bed Fusion

Abstract

This study evaluates the effect of post-manufacturing treatment on the compressive performance of additively manufactured components. The components were thin cylindrical shells with an aspect ratio of 25:1 manufactured using laser powder bed fusion and that were then surface treated by means of sandblasting or turning. The as-printed and subsequently surface treated samples were uniaxially compressed until failure to depict the effect of the surface condition on the compressive mechanical behavior. The results show that as the surfaces became smoother via sandblasting, the average peak strength for buckling load improves negligibly (0.85%), whereas this effect reaches 6.5% upon surface layer removal via turning. Through microstructural investigation and co-relating this with an understanding of processing conditions existing in manufacturing itself, this effect is seen to be linked to contour scanning causing softening of the surface region in a component.

Laser polishing: a review of a constantly growing technology in the surface finishing of components made by additive manufacturing

“…Laser polishing can also be profitably used to ease the manufacture of full density or near full density components [136][137][138]. The powder bed is made up of numerous voids.…”

Localized Perturbation Load Approach for Buckling Design of Thin-Walled Steel Cylindrical Shells under Partial Axial Compression

“…As a crucial engineering structure, the thin-walled steel cylindrical shell has obtained widespread application in most industrial fields. This structure tends to buckle when subjected to axial compression loads, and buckling failure is a critical concern in the design work of thin-walled cylindrical shell structures [1][2][3][4][5][6]. A large number of cylindrical shell buckling experiments have been carried out, and researchers have found that the experimentally observed buckling loads are far short of the theoretical predicted buckling loads of perfect shells [7,8].…”

Effect of Blasting Treatments on the Surface Topography and Cell Adhesion on Biodegradable FeMn‐Based Stents Processed by Laser Powder Bed Fusion

“…For postprocessing of LPBF‐processed components, chemical (e.g., electrochemical polishing), physical (e.g., thermal spraying), or mechanical methods (e.g., blasting treatments, milling) are applied. [ 37–40 ] The mechanical method of blasting is thereby widespread as first postprocessing step after the LPBF process. [ 32,37 ] It will introduce residual compressive stress in the component surface due to plastic deformation, which has a positive effect on, e.g., hardness, fatigue, and tensile strength, as seen for other bulk materials.…”