Effect of process parameters in laser cladding on substrate melted areas and the substrate melted shape

Goodarzi, Dara Moazami; Pekkarinen, Joonas; Salminen, Antti

doi:10.2351/1.4906376

Cited by 64 publications

(37 citation statements)

References 4 publications

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“…The impact of the laser parameters such as travel speed, laser power, or powder flow on the geometrical dimensions of the single-clad deposited is, generally, well known [ 30 , 31 ]. As a general tendency, low powder flows and process speeds melt the substrate material, thus increasing the degree to which a given layer penetrates into the previous one or into the substrate, known as dilution [ 32 ].…”

Section: Methodsmentioning

confidence: 99%

Direct Generation of High-Aspect-Ratio Structures of AISI 316L by Laser-Assisted Powder Deposition

Alvarez¹,

Montealegre²,

Cordovilla

et al. 2020

Materials

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The effect of process parameters and the orientation of the cladding layer on the mechanical properties of 316L stainless steel components manufactured by laser metal deposition (LMD) was investigated. High aspect-ratio walls were manufactured with layers of a 4.5 mm wide single-cladding track to study the microstructure and mechanical properties along the length and the height of the wall. Samples for the tensile test (according to ASTM E-8M-04) were machined from the wall along both the direction of the layers and the direction perpendicular to them. Cross-sections of the LMD samples were analyzed by optical and scanning electron microscopy (SEM). The orientation of the growing grain was observed. It was associated with the thermal gradient through the building part. A homogeneous microstructure between consecutive layers and some degree of microporosity was observed by SEM. Uniaxial tension tests were performed on samples extracted from the wall in perpendicular and parallel directions. Results for ultimate tensile strength were similar in both cases and with the wrought material. The σ0.2 were similar in both cases but slightly superior to the wrought material.

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Section: Methodsmentioning

confidence: 99%

Direct Generation of High-Aspect-Ratio Structures of AISI 316L by Laser-Assisted Powder Deposition

Alvarez¹,

Montealegre²,

Cordovilla

et al. 2020

Materials

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show abstract

“…Therefore, some works revealed the possibility of coating design by cladding with substrate material selection and dilution control [12][13][14][15][16][17][18] while many others indicated, as a research opportunity, the processing of composite coatings by laser cladding [2][3][4][5][6][7][8][9][10] . The latter involves an even more intricate task because of the need to select and manage the clad alloy, reinforcement particle type, and its amount, substrate, and laser processing parameters 19,20 .…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Wear Behavior of NbC-Reinforced Ni-Based Alloy Composite Coatings by Laser Cladding

et al. 2021

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This work aims to evaluate the influence of laser power and reinforcement feeding rate on the microstructure, hardness, and wear behavior of NbC-reinforced Hastelloy C276 TM alloy composite coatings. From a dual feeding system, one-step metal-matrix composite coatings were deposited with 10, 30, and 50% mass feeding of NbC powder with laser powers of 1.5 and 3.0 kW. Coatings deposited with 1.5 kW and 30% NbC showed some degree of porosity due to a combination of NbC feeding rate and melting pool temperature. Laser power and NbC feeding rate altered the melting efficiency and substrate burn-in shape, remarkably influencing the dilution. The composite microstructure was comprised of Ni-γ (FCC) dendrites with interdendritic network carbide which, in turn, ranged from lamellar-like M 6 C to blocky-like conjugated MC-M 23 C 6 carbide. Primary petaloid-like MC [Nb] carbide was formed from a 30% reinforcement rate on, whilst a considerable number of unmelted particles was observed for 50%. The higher the reinforcement feeding rate, the higher the carbide fraction and better wear performance of low heat-input specimens. Synthesis with high heat-input sheds a light on the deleterious effect of the dilution and is not an option to enhance the wear performance.

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“…Furthermore, the specific energies from the process parameters in this work and the other works were measured to find the minimal specific energy for avoiding the LOF. The specific energy (J•g -1 ) was calculated using these following formulas which were used in the laser cladding process 12) :…”

Section: Introductionmentioning

confidence: 99%

Effect of Process Parameters on the Formation of Lack of Fusion in Directed Energy Deposition of Ti-6Al-4V Alloy

Nursyifaulkhair

Park

Baek

et al. 2019

Journal of Welding and Joining

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The effect of different process parameters on the formation of lack of fusion (LOF) in Ti-6Al-4V alloy fabricated using DED was studied. The specific energy was calculated to evaluate the minimal amount of required energy to avoid LOF. The results showed that a specific energy smaller than 2700 J.g-1 led to the formation of LOF; however, a higher specific energy was able to successfully prevent the defect. A smaller amount of specific energy resulted in inadequate heat, which was too low to completely melt the metal powder, and resulted in insufficient penetration depth. Subsequently, LOF was observed between the interface of the deposited layers. Furthermore, a higher powder feed rate had a more significant effect on the formation of LOF than higher laser power.

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Effect of process parameters in laser cladding on substrate melted areas and the substrate melted shape

Cited by 64 publications

References 4 publications

Direct Generation of High-Aspect-Ratio Structures of AISI 316L by Laser-Assisted Powder Deposition

Direct Generation of High-Aspect-Ratio Structures of AISI 316L by Laser-Assisted Powder Deposition

Microstructure and Wear Behavior of NbC-Reinforced Ni-Based Alloy Composite Coatings by Laser Cladding

Effect of Process Parameters on the Formation of Lack of Fusion in Directed Energy Deposition of Ti-6Al-4V Alloy

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