A hybrid numerical-analytical-experimental framework to estimate the surface state and fatigue performance of laser powder bed fusion materials after surface treatment of shot peening

2021 ◽  
pp. 150758
Author(s):  
Hamed Khajehmirza ◽  
Asghar Heydari Astaraee ◽  
Stefano Monti ◽  
Mario Guagliano ◽  
Sara Bagherifard
Keyword(s):  
Surface Treatment ◽  
Surface State ◽  
Shot Peening ◽  
Fatigue Performance ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Fusion Materials

Low-cycle fatigue performance of remelted laser powder bed fusion (L-PBF) biomedical Ti25Ta

2020 ◽  
Vol 798 ◽  
pp. 140228 ◽  
Author(s):  
Erin G. Brodie ◽  
Julia Richter ◽  
Thomas Wegener ◽  
Thomas Niendorf ◽  
Andrey Molotnikov
Keyword(s):  
Low Cycle Fatigue ◽  
Fatigue Performance ◽  
Powder Bed Fusion ◽  
Cycle Fatigue ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

scholarly journals HIGH CYCLE FATIGUE PERFORMANCE OF TI6AL4V(ELI) SPECIMENS PRODUCED WITH INHERENT LASER POWDER BED FUSION SURFACE ROUGHNESS

2021 ◽  
Vol 32 (3) ◽  
pp. 248-257
Author(s):  
Hlakae Patrick Miya ◽  
Willie Bouwer du Preez ◽  
Lehlohonolo Francis Monaheng
Keyword(s):  
Surface Roughness ◽  
Surface Defects ◽  
Fatigue Testing ◽  
Fatigue Performance ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Heat Treated ◽  
Initiation And Propagation ◽  
Cycles To Failure

This study investigated how surface defects affect the fatigue performance of laser powder bed fusion (LPBF) Ti6Al4V(ELI) test specimens in as-built surface roughness and heat-treated conditions. Tensile and fatigue specimens were built in three orthogonal directions for testing. Fatigue testing was carried out to determine the maximum stress at which a run-out number of 5 million cycles to failure could be achieved. Fractured specimens were analysed and compared for crack initiation and propagation characteristics using scanning electron microscopy. Conclusions were drawn on the possibility of producing Ti6Al4V(ELI) aircraft components through LPBF.

scholarly journals Scale, Material Concentration, Stress Relief and Part Removal Effects on the Dimensional Behaviour of Selected AlSi10Mg Components Manufactured by Laser Powder Bed Fusion

2019 ◽  
Vol 3 (2) ◽  
pp. 49
Author(s):  
Floriane Zongo ◽  
Antoine Tahan ◽  
Vladimir Brailovski
Keyword(s):  
Shot Peening ◽  
Scale Effects ◽  
Three Dimensional ◽  
Stress Relief ◽  
Computer Assisted ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Before And After ◽  
3D Profile

Laser Powder Bed Fusion (LPBF) is a predominant Additive Manufacturing (AM) process. While metallic LPBF is gaining popularity, one of the barriers facing its wider industrial use is the current relatively limited knowledge with respect to its dimensional and geometrical performance, as well as the inability to predict it. This paper presents an experimental investigation of the geometrical and dimensional deviations of selected LPBF-manufactured components according to the ASME Y14.5 (2009) standard. In this study, two types of axisymmetric parts (cylinder and cylindrical pyramid) were designed with three different levels of material concentration, and replicated at three different scales for a total of 18 test artifacts. These parts were manufactured from AlSi10Mg powder using an EOSINT M280 printer, subjected to stress relief annealing at 300 °C for two hours, removed from the platform and finished by micro shot peening. A complete statistical analysis was carried out on the artifacts before and after each post-processing step. The results of this investigation allowed for the quantification of the intra- (same part) and inter- (different parts) scale effects, as well as of the material concentration, stress relief, part removal and micro shot peening effects on the overall three-dimensional (3D) profile deviations and on the dimensional deviations of some selected features (e.g., diameter, thickness). For example, cylindrical pyramid parts showed the following average deviations of their outside diameters: a −63 µm shrinkage of the as-built part diameter as compared to its computer-assisted design (CAD) value, a +20 µm expansion after stress relief annealing as compared to the precedent step, a −18 µm shrinkage after part removal and, finally, a −50 µm shrinkage after micro shot peening.

Effects of post-processing route on fatigue performance of laser powder bed fusion Inconel 718

2020 ◽  
Vol 36 ◽  
pp. 101442
Author(s):  
Dennise Tanoko Ardi ◽  
Lim Guowei ◽  
Niroj Maharjan ◽  
Bisma Mutiargo ◽  
Seng Hwee Leng ◽  
...  
Keyword(s):  
Inconel 718 ◽  
Fatigue Performance ◽  
Processing Route ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Post Processing ◽  
Powder Bed
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