Effect of build atmosphere on the mechanical properties of AlSi10Mg produced by selective laser melting

Rakesh, C. H.; Priyanka, Nadig; Jayaganthan, R.; Vasa, Nilesh J.

doi:10.1016/j.matpr.2018.04.133

Cited by 28 publications

(11 citation statements)

References 12 publications

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“…Since the clads were produced in N 2 atmosphere, there is a possibility of nitrogen dissolution in the clads during melting process. Past literature shows an increasing dissolved nitrogen content in the AM component with increasing VED 92,93 . Therefore, increasing VED and slower cooling rates would facilitate nitrogen dissolution in the clads.…”

Section: Electrochemical Characterization At the Beginning Of The Comentioning

confidence: 82%

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Murkute

Pasebani

Isgor

2020

Sci Rep

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this study aims to improve the corrosion resistance of the low carbon steel by cladding it with super duplex stainless steel using laser powder bed fusion process. critical process parameters such as laser power, laser scan speed, hatch spacing, and powder layer thickness were optimized to achieve the best possible metallurgical bonding between the clad and the substrate. the evaporative losses experienced during the laser melting process resulted in clad layers with lower chromium content (12-25 wt. %) as compared to 26 wt. % of the feedstock powder. A clad thickness of 65.8 µm was achieved after melting ten 50 µm thick powder layers. the higher cooling rates associated with laser powder bed fusion resulted in fine high aspect ratio columnar grain structures with predominantly ferrite grains; however, widmanstätten austenite needles were observed with increasing laser scan speeds. increasing scan speed had a negative impact on the thickness, corrosion resistance, and the pitting potential of the clads exposed to 3.5 wt.% NaCl aqueous solution. Clads produced at the lowest scan speeds showed comparable corrosion resistance to rolled and annealed super duplex stainless steel. Duplex stainless steels (DSS) are a special class of ferrous alloys with a balanced ferrite (δ) and austenite (γ) phase microstructure. This dual-phase structure imparts these steels a high strength, toughness, and increased corrosion resistance in environments containing acids, acid chlorides, seawater, and caustic chemicals. Super duplex stainless steels (SDSS) 1 are a variant of DSS with higher Cr (25-26 wt. %) and Mo (4 wt. %) contents. SDSS typically shows superior pitting and stress corrosion cracking resistance than DSS; therefore, the use of SDSS has been increasing in highly corrosive environments, including oil and gas infrastructure, desalination plants, chemical storage tanks, heat exchangers, and paper/pulp manufacturing facilities 1. Although low carbon steel (LCS) remains to be the most widely used ferrous alloy, its applications are limited because it is highly vulnerable to corrosion in neutral, acidic, or saline environments 2. Corrosion-resistant SDSS alloys possess superior corrosion resistance than the LCS for the aforementioned applications, albeit with a significantly higher material cost. One of the viable means to reduce the component cost without compromising on service life is to manufacture a composite with a low-cost tough and ductile substrate cladded with a wear and corrosion resistant surface, as in the case of SDSS clads on an LCS substrate. These dissimilar metal composites (cladded systems) have been produced in the past using conventional manufacturing techniques such as welding 3-5 , diffusion bonding 6 , powder roll bonding 7 , hot rolling 8 , and reduction bonding 9. However, conventionally manufactured composites are often unfit for field use due to substandard clad-substrate bonding, often leading to clad delamination when subjected to operational stresses in the field. This substandard bond typically ...

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Section: Electrochemical Characterization At the Beginning Of The Comentioning

confidence: 82%

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Murkute

Pasebani

Isgor

2020

Sci Rep

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“…Although strength was promoted, elongation was suppressed compared to the as-cast reference due to high residual stresses. Rakesh et al [9] showed that even the type of inert atmosphere (Ar/N 2 ) is reflected in the mechanical performance of SLM AlSi10Mg. Samples processed in N 2 reached about 6% higher value of UTS.…”

Section: Introductionmentioning

confidence: 99%

Specific Response of Additively Manufactured AlSi9Cu3Fe Alloy to Precipitation Strengthening

et al. 2019

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The additive manufacturing of Al-Si-Cu/Mg alloys along with their precipitation strengthening represents a promising option of producing high-strength complex-shaped light-weight components for special applications in automotive or aerospace. In this paper, we follow our previous research on AlSi9Cu3Fe alloy prepared by one of the additive manufacturing technologies, selective laser melting (SLM). We characterize the precipitation strengthening of this material during conventional T6 heat treatment, and also present the possibility of its precipitation strengthening by annealing at temperatures of 413-453 K without previous solutionizing. We revealed the specific response of the studied material consisting in the simultaneous precipitation of semi-coherent θ′ precipitates and Si platelets. By characterization of hardness, mechanical performance under tensile loading and microstructure, we demonstrate that the AlSi9Cu3Fe alloy is not stable when prepared by SLM and its stability can be induced by additional heat treatment. The results of our work thus yield with a practical recommendation for applications where temperature increase may occur.

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“…In addition, the high-magnification SEM micrographs showed that the lamellar β grain (red arrow) appeared near the TiN and α grain boundary. It revealed that introducing N into the building gas during the LPBF process could cause the Ti molten pool to experience a more intense thermal history process [42]. As a result, the LPBF process effectively influenced the heat around the molten pool and changed the microstructure of the CPTi.…”

Section: Morphology and Microstructures Of Lpbf Unti Compositesmentioning

confidence: 99%

In-situ additive manufacturing of high strength yet ductility titanium composites with gradient layered structure using N₂

Xiao,

Song,

Liu

et al. 2024

Int. J. Extrem. Manuf.

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It has always been challenging work to reconcile the contradiction between the strength and plasticity of titanium materials. Laser powder bed fusion (LPBF) is a convenient method to fabricate innovative composites including those inspired by gradient layered materials. In this work, we used LPBF to selectively prepare TiN/Ti gradient layered structure (GLSTi) composites by using different N2-Ar ratios during the LPBF process. We systematically investigated the mechanisms of in-situ synthesis TiN, high strength and ductility of GLSTi composites using microscopic analysis, TEM characterization, and tensile testing with digital image correlation. Besides, a digital correspondence was established between the N2 concentration and the volume fraction of LPBF in-situ synthesized TiN. Our results show that the GLSTi composites exhibit superior mechanical properties compared to pure titanium fabricated by LPBF under pure Ar. Specifically, the tensile strength of GLSTi was more than 1.5 times higher than that of LPBF-formed pure titanium, reaching up to 1100 MPa, while maintaining a high elongation at fracture of 17%. GLSTi breaks the bottleneck of high strength but low ductility exhibited by conventional nanoceramic particle-strengthened titanium matrix composites, and the hetero-deformation induced strengthening effect formed by the TiN/Ti layered structure explained its strength-plasticity balanced principle. The microhardness exhibits a jagged variation of the relatively low hardness of 245 HV0.2 for the pure titanium layer and a high hardness of 408 HV0.2 for the N2 in-situ synthesis layer. Our study provides a new concept for the structure-performance digital customization of 3D-printed Ti-based composites.

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Effect of build atmosphere on the mechanical properties of AlSi10Mg produced by selective laser melting

Cited by 28 publications

References 12 publications

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Specific Response of Additively Manufactured AlSi9Cu3Fe Alloy to Precipitation Strengthening

In-situ additive manufacturing of high strength yet ductility titanium composites with gradient layered structure using N₂

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Effect of build atmosphere on the mechanical properties of AlSi10Mg produced by selective laser melting

Cited by 28 publications

References 12 publications

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Metallurgical and Electrochemical Properties of Super Duplex Stainless Steel Clads on Low Carbon Steel Substrate produced with Laser Powder Bed Fusion

Specific Response of Additively Manufactured AlSi9Cu3Fe Alloy to Precipitation Strengthening

In-situ additive manufacturing of high strength yet ductility titanium composites with gradient layered structure using N2

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Product

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About

In-situ additive manufacturing of high strength yet ductility titanium composites with gradient layered structure using N₂