Manufacturing Of Functionally Graded Materials


Laser deposition of metal layers has been recognized in recent years as a one-step process to fabricate metal parts. A one-dimensional model was developed to calculate the plume temperature, process parameters and melt pool characteristics. The model accounts for the transmission of the laser beam through the plume, energy transfer in the molten phase and the Stefan conditions at the solid-liquid and liquid-vapor interfaces. The surface temperature at the molten surface is found to exceed the normal boiling temperature causing the pressure to be higher than one atmospheric pressure. The plume temperatures were found to be below the respective material's ionization temperature. The calculated plume temperatures are in good agreement with the values obtained from the spectral data. Also, the model predictions for remelt layer depth, deposition height and plasma height compare well with experimental data. The authors have employed this one-step technique to create graded materials by varying the part's composition from 100 % stainless steel to a 100 % nickel-based superalloy. Mechanical properties of these graded materials are measured and the effects of slow solidification rates are investigated.

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American Society of Mechanical Engineers, Materials Division (Publication) MD



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Personal Identifier


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14044252370 (Scopus)

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