Analysis of melt pool temperature and stresses in laser cladding of inconel 718

Laser aided Directed Material Deposition (DMD) is an additive manufacturing process based on laser cladding. A full understanding of laser cladding is essential in order to achieve a steady state and robust DMD process. A two dimensional mathematical model of laser cladding with droplet injection was developed to understand the influence of fluid flow on the mixing, dilution depth, and deposition dimension, while incorporating melting, solidification, and evaporation phenomena. The fluid flow in the melt pool that is driven by thermal capillary convection and an energy balance at the liquid–vapor and the solid–liquid interface was investigated and the impact of the droplets on the melt pool shape and ripple was also studied. Dynamic motion, development of melt pool and the formation of cladding layer were simulated. The simulated results for average surface roughness were compared with the experimental data and showed a comparable trend.

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A Comparative Analysis of Laser Additive Manufacturing of High Layer Thickness Pure Ti and Inconel 718 Alloy Materials Using Finite Element Method

Materials ◽

10.3390/ma14040876 ◽

2021 ◽

Vol 14 (4) ◽

pp. 876 ◽

Cited By ~ 1

Author(s):

Sapam Ningthemba Singh ◽

Sohini Chowdhury ◽

Yadaiah Nirsanametla ◽

Anil Kumar Deepati ◽

Chander Prakash ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Layer Thickness ◽

Inconel 718 ◽

Laser Power ◽

Scanning Speed ◽

Laser Additive Manufacturing ◽

Inconel 718 Alloy ◽

Melt Pool ◽

High Layer

Investigation of the selective laser melting (SLM) process, using finite element method, to understand the influences of laser power and scanning speed on the heat flow and melt-pool dimensions is a challenging task. Most of the existing studies are focused on the study of thin layer thickness and comparative study of same materials under different manufacturing conditions. The present work is focused on comparative analysis of thermal cycles and complex melt-pool behavior of a high layer thickness multi-layer laser additive manufacturing (LAM) of pure Titanium (Ti) and Inconel 718. A transient 3D finite-element model is developed to perform a quantitative comparative study on two materials to examine the temperature distribution and disparities in melt-pool behaviours under similar processing conditions. It is observed that the layers are properly melted and sintered for the considered process parameters. The temperature and melt-pool increases as laser power move in the same layer and when new layers are added. The same is observed when the laser power increases, and opposite is observed for increasing scanning speed while keeping other parameters constant. It is also found that Inconel 718 alloy has a higher maximum temperature than Ti material for the same process parameter and hence higher melt-pool dimensions.

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Microstructure and Corrosion Properties of La2Zr2O7/NiCoAlY Thermal Barrier Coatings Deposited on Inconel 718 Superalloy by Laser Cladding

Coatings ◽

10.3390/coatings11010101 ◽

2021 ◽

Vol 11 (1) ◽

pp. 101

Author(s):

Kaijin Huang ◽

Wei Li ◽

Kai Pan ◽

Xin Lin ◽

Aihua Wang

Keyword(s):

Corrosion Resistance ◽

Thermal Barrier Coating ◽

Laser Cladding ◽

Inconel 718 ◽

Electrochemical Techniques ◽

Thermal Barrier ◽

Nacl Solution ◽

Corrosion Performance ◽

Barrier Coating ◽

Inconel 718 Superalloy

In order to improve the seawater corrosion resistance of Inconel 718 superalloy, a La2Zr2O7/NiCoCrAlY thermal barrier coating corrosion resistant to 3.5 wt.% NaCl aqueous solution was prepared by laser cladding on Inconel 718 superalloy. X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and electrochemical techniques were used to study the microstructure and the corrosion performance of the coating in 3.5 wt.% NaCl solution. The results show that the thermal barrier coating is mainly composed of primary La2Zr2O7 phase and γ + laves/δ phase eutectic structure. The corrosion potential and corrosion current of the coating in 3.5 wt.% NaCl solution are higher and lower than that of the Inconel 718 substrate, respectively, indicating that the corrosion performance of the coating is better than that of the Inconel 718 substrate. The presence of La2Zr2O7 phase in the thermal barrier coating is the main reason for its corrosion resistance to 3.5 wt.% NaCl solution.

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A Hybrid Deep Learning Model for Layer-Wise Melt Pool Temperature Forecasting in Wire-Arc Additive Manufacturing Process

IEEE Access ◽

10.1109/access.2021.3097177 ◽

2021 ◽

Vol 9 ◽

pp. 100652-100664

Author(s):

Pavan Kumar Nalajam ◽

Ramesh Varadarajan

Keyword(s):

Deep Learning ◽

Additive Manufacturing ◽

Manufacturing Process ◽

Learning Model ◽

Melt Pool ◽

Temperature Forecasting ◽

Melt Pool Temperature ◽

Wire Arc Additive Manufacturing ◽

Deep Learning Model

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Numerical Model for Predicting Bead Geometry and Microstructure in Laser Beam Welding of Inconel 718 Sheets

10.20944/preprints201806.0311.v1 ◽

2018 ◽

Author(s):

Iñigo Hernando ◽

Jon Iñaki Arrizubieta ◽

Aitzol Lamikiz ◽

Eneko Ukar

Keyword(s):

Numerical Model ◽

Laser Beam ◽

Inconel 718 ◽

Laser Beam Welding ◽

Welding Process ◽

Bead Geometry ◽

Predictive Tool ◽

Melt Pool ◽

Dendritic Arm Spacing ◽

Weld Seams

A numerical model was developed for predicting the bead geometry and microstructure in Laser Beam Welding of 2 mm thickness Inconel 718 sheets. The experiments were carried out with a 1 kW maximum power fiber laser coupled with a galvanometric scanner. Wobble strategy was employed for sweeping 1 mm wide circular areas for creating the weld seams and a specific tooling was manufactured for supplying protective Argon gas during the welding process. The numerical model takes into account both the laser beam absorption and the melt-pool fluid movement along the bead section, resulting in a weld geometry that depends on the process input parameters, such as feed rate and laser power. The microstructure of the beads was also estimated based on the cooling rate of the material. Features as bead upper and bottom final shapes, weld penetration and dendritic arm spacing were numerically and experimentally analyzed and discussed. The results given by the numerical analysis agree with the tests, making the model a robust predictive tool.

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Study of the Influence of Shielding Gases on Laser Metal Deposition of Inconel 718 Superalloy

Materials ◽

10.3390/ma11081388 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1388 ◽

Cited By ~ 11

Author(s):

Jose Ruiz ◽

Magdalena Cortina ◽

Jon Arrizubieta ◽

Aitzol Lamikiz

Keyword(s):

Metal Deposition ◽

Slight Reduction ◽

Laser Metal Deposition ◽

Melt Pool ◽

Industrial Sectors ◽

Inconel 718 Superalloy ◽

Melt Pool Temperature ◽

Different Gases ◽

Die And Mold

The use of the Laser Metal Deposition (LMD) technology as a manufacturing and repairing technique in industrial sectors like the die and mold and aerospace is increasing within the last decades. Research carried out in the field of LMD process situates argon as the most usual inert gas, followed by nitrogen. Some leading companies have started to use helium and argon as carrier and shielding gas, respectively. There is therefore a pressing need to know how the use of different gases may affect the LMD process due there being a lack of knowledge with regard to gas mixtures. The aim of the present work is to evaluate the influence of a mixture of argon and helium on the LMD process by analyzing single tracks of deposited material. For this purpose, special attention is paid to the melt pool temperature, as well as to the characterization of the deposited clads. The increment of helium concentration in the gases of the LMD processes based on argon will have three effects. The first one is a slight reduction of the height of the clads. Second, an increase of the temperature of the melt pool. Last, smaller wet angles are obtained for higher helium concentrations.

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