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MODELLING OF TRANSPORT PHENOMENA IN LASER SURFACE ALLOYING WITH DISTRIBUTED MELTING OF ALLOYING ELEMENT

P. Mohan Raj
Dept. of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, INDIA

S. Sarkar
Dept. of Mechanical Engineering, Indian Institute of Science, Bangalore 560012, INDIA

Suman Chakraborty
Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India; Advanced Technology Development Centre, Indian Institute of Technology Kharagpur 721302, Kharagpur, India

G. Phanikumar
Dept. of Metallurgy Indian, Institute of Science, Bangalore 560012, INDIA

Pradip Dutta
Dept. of Mechanical Engineering Indian Institute of Science Bangalore, INDIA

K. Chattopadhyay
Dept. of Metallurgy, Indian Institute of Science, Bangalore 560012, INDIA

Sinopsis

In this paper, a three dimensional transient macroscopic numerical model is developed for the description of transport phenomena during laser surface alloying. In order to make accurate estimates for the species composition distribution during the process, the addition of alloying elements is formulated by devising a species generation term for the solute transport equation. By employing a particle-tracking algorithm and a simultaneous particle-melting consideration, the species source term is estimated by the amount of fusion of a spherical particle as it passes through a particular control volume. Numerical simulations are performed for Ni as alloying element on Al base metal and are compared with the available experimental results. It is revealed that the present model makes a more accurate prediction of composition variation within the resolidified microstructure, as compared to a model that does not incorporate any considerations of distributed melting.

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