Influence of shielding gas flow on the μLMWD of biodegradable Mg alloy and permanent stainless steel for additive manufacturing of biomedical implants

2022 ◽  
Author(s):  
Anna Kaljevic ◽  
Ali Gökhan Demir
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Gas Flow ◽  
Mg Alloy ◽  
Biomedical Implants ◽  
Shielding Gas

scholarly journals Parameters Optimization of Auxiliary Gas Process for Double-Wire SS316L Stainless Steel Arc Additive Manufacturing

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 190
Author(s):  
Wei Wu ◽  
Jiaxiang Xue ◽  
Wei Xu ◽  
Hongyan Lin ◽  
Heqing Tang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Process Parameters ◽  
Evaluation System ◽  
Gas Flow ◽  
Interactive Effect ◽  
Parameters Optimization ◽  
Heat Accumulation ◽  
Auxiliary Process ◽  
Strength And Stiffness

Serious heat accumulation limits the further efficiency and application in additive manufacturing (AM). This study accordingly proposed a double-wire SS316L stainless steel arc AM with a two-direction auxiliary gas process to research the effect of three parameters, such as auxiliary gas nozzle angle, auxiliary gas flow rate and nozzle-to-substrate distance on depositions, then based on the Box–Behnken Design response surface, a regression equation between three parameters and the total score were established to optimized parameters by an evaluation system. The results showed that samples with nozzle angle of 30° had poor morphology but good properties, and increasing gas flow or decreasing distance would enhance the airflow strength and stiffness, then strongly stir the molten pool and resist the interference. Then a diverse combination of auxiliary process parameters had different influences on the morphology and properties, and an interactive effect on the comprehensive score. Ultimately the optimal auxiliary gas process parameters were 17.4°, 25 L/min and 10.44 mm, which not only bettered the morphology, but refined the grains and improved the properties due to the stirring and cooling effect of the auxiliary gas, which provides a feasible way for quality and efficiency improvements in arc additive manufacturing.

Laser additive manufacturing of Zn porous scaffolds: Shielding gas flow, surface quality and densification

2019 ◽  
Vol 35 (2) ◽  
pp. 368-376 ◽  
Author(s):  
Peng Wen ◽  
Yu Qin ◽  
Yanzhe Chen ◽  
Maximilian Voshage ◽  
Lucas Jauer ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Surface Quality ◽  
Gas Flow ◽  
Porous Scaffolds ◽  
Shielding Gas ◽  
Laser Additive Manufacturing ◽  
Flow Surface

scholarly journals On the effect of shielding gas flow on porosity and melt pool geometry in laser powder bed fusion additive manufacturing

2020 ◽  
Vol 32 ◽  
pp. 101030 ◽  
Author(s):  
Joni Reijonen ◽  
Alejandro Revuelta ◽  
Tuomas Riipinen ◽  
Kimmo Ruusuvuori ◽  
Pasi Puukko
Keyword(s):  
Additive Manufacturing ◽  
Gas Flow ◽  
Powder Bed Fusion ◽  
Shielding Gas ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Melt Pool

An Investigation Into the Challenges of Using Metal Additive Manufacturing for the Production of Patient-Specific Aneurysm Clips

2019 ◽  
Vol 13 (3) ◽  
Author(s):  
Brandon J. Walker ◽  
Benjamin L. Cox ◽  
Ulas Cikla ◽  
Gabriel Meric de Bellefon ◽  
Behzad Rankouhi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Surgical Complication ◽  
Vascular Anatomy ◽  
Patient Specific ◽  
Biomedical Implants ◽  
Metal Additive Manufacturing ◽  
316 L Stainless Steel ◽  
Material Choice ◽  
Metal Additive

Cerebral aneurysm clips are biomedical implants applied by neurosurgeons to re-approximate arterial vessel walls and prevent catastrophic aneurysmal hemorrhages in patients. Current methods of aneurysm clip production are labor intensive and time-consuming, leading to high costs per implant and limited variability in clip morphology. Metal additive manufacturing is investigated as an alternative to traditional manufacturing methods that may enable production of patient-specific aneurysm clips to account for variations in individual vascular anatomy and possibly reduce surgical complication risks. Relevant challenges to metal additive manufacturing are investigated for biomedical implants, including material choice, design limitations, postprocessing, printed material properties, and combined production methods. Initial experiments with additive manufacturing of 316 L stainless steel aneurysm clips are carried out on a selective laser melting (SLM) system. The dimensions of the printed clips were found to be within 0.5% of the dimensions of the designed clips. Hardness and density of the printed clips (213 ± 7 HV1 and 7.9 g/cc, respectively) were very close to reported values for 316 L stainless steel, as expected. No ferrite and minimal porosity is observed in a cross section of a printed clip, with some anisotropy in the grain orientation. A clamping force of approximately 1 N is measured with a clip separation of 1.5 mm. Metal additive manufacturing shows promise for use in the creation of custom aneurysm clips, but some of the challenges discussed will need to be addressed before clinical use is possible.

scholarly journals Gas flow study for development of a novel shielding gas nozzle for directed energy deposition processes using computational fluid dynamic simulations

2021 ◽  
Vol 1135 (1) ◽  
pp. 012016
Author(s):  
Yogesh Nalam ◽  
Tobias Hauser ◽  
Philipp Peter Breese ◽  
Tobias Kamps ◽  
Yves Küsters ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Gas Flow ◽  
Energy Deposition ◽  
Fluid Dynamic ◽  
Ambient Atmosphere ◽  
Shielding Gas ◽  
Dynamic Simulations ◽  
Directed Energy Deposition ◽  
Directed Energy ◽  
Dynamics Simulations

Abstract Directed energy deposition (DED) enables the additive manufacturing of several materials such as molybdenum alloys that are very difficult to process by conventional methods. Some of these materials are highly reactive to gases in ambient atmosphere such as oxygen, and nitrogen. Oxidation during additive manufacturing significantly influences the mechanical properties of a part. In some cases, the shielding gas coverage of standard powder nozzles is not sufficient, and oxidation still takes place. A functional prototype of a compound multi flow path annular nozzle was developed using computational fluid dynamics simulations. Simulations were performed using multi-component miscible gas model. Prototypes were manufactured for several design iterations to test their functionality in cold flow conditions. In the end, an Inconel based prototype was built, using laser powder bed fusion. The volume of shielding gas cover over the substrate improved with the proposed design and the radial extent of 80 ppm oxygen concentration increased from 8 mm to 25 mm. Finally, Mo-Si-B alloy was deposited on a 1000 °C pre-heated substrate without significant oxidation or cracks.

Parametric Optimization of Dissimilar TIG Welding of AISI 304L and 430 Steel Using Taguchi Analysis

2019 ◽  
Vol 969 ◽  
pp. 625-630
Author(s):  
A. Sivanantham ◽  
S. Manivannan ◽  
S.P. Kumaresh Babu
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Flow Rate ◽  
Welding Speed ◽  
Gas Flow ◽  
Welding Current ◽  
Dissimilar Welding ◽  
Shielding Gas ◽  
Gas Flow Rate ◽  
Aisi 304L

Dissimilar welding of 3mm thickness of AISI 304L austenitic stainless steel plate and AISI 430 ferritic stainless steel plates were performed by Tungsten Inert Gas welding without any filler material by using argon as shielding gas. Welding is carried out according to set of combinations of welding parameters such as welding current (levels of 135,140,145 Ampere), welding speed (levels of 105, 110, 115 mm/min) and shielding gas flow rate (of levels 5,10,15 Litre/min) obtained through Taguchi L9 orthogonal approach for maximizing the ultimate tensile strength by using MiniTab software . Radiography test was performed to know the soundness of the welds. Tensile specimens are fabricated as per ASTM E8 standard for tensile testing. Microstructural observations of the weld are performed. Correlations have been obtained to know the effect of welding speed, welding current and shielding gas flow rate on tensile strength and an optimum level of parameter is obtained at welding current of 145 Ampere, welding speed of 115 mm/min and shielding gas flow rate of 5 Litre/min.

Effects of nitrogen and hydrogen in argon shielding gas on bead profile, delta-ferrite and nitrogen contents of the pulsed GTAW welds of AISI 316L stainless steel

2016 ◽  
Vol 58 (6) ◽  
pp. 489-494 ◽  
Author(s):  
Panyasak Phakpeetinan ◽  
Amnuysak Chianpairot ◽  
Ekkarut Viyanit ◽  
Fritz Hartung ◽  
Gobboon Lothongkum
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Aisi 316L ◽  
Shielding Gas ◽  
Delta Ferrite ◽  
Aisi 316L Stainless Steel ◽  
Pulsed Gtaw ◽  
Nitrogen Contents ◽  
Bead Profile
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