ISSN Online: 2688-7231
ISBN Online: 978-1-56700-524-0
Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
Melting and solidification of metal matrix nanocomposites during laser melting
要約
A numerical model to capture the melting and subsequent
solidification at micro-scale during laser melting of binary
alloy matrix nanocomposites is developed. The enthalpy method is used to develop the model. The nanoparticles are treated similar to an alloying element and a volume averaged
concentration is used to specify the distribution of
nanoparticles. The diffusion driven movement of nanoparticles
is formulated using the Stokes-Einstein equation. The low
wettability of the nanoparticles is incorporated in the model by defining a parameter called nanoparticle partition coefficient. The effect of nanoparticles on solidification is also incorporated in the model. The laser power input is modelled as a heat input term. The liquid fraction evolution, solute distribution, nanoparticle distribution and final microstructure during the laser melting process are captured. The effect of initial nanoparticle concentration on final nanoparticle distribution and liquid fraction evolution is studied. It is observed that the nanoparticle accumulation between the grain boundaries increases with increase in initial nanoparticle concentration.