Numerical modelling of heat and mass transfer in laser surface alloying: Non-equilibrium solidification effects Available to Purchase

A three dimensional transient macroscopic model is developed for studying heat and mass transfer in a single-pass laser surface alloying process, with particular emphasis to non-equilibrium solidification considerations. The solution for species concentration distribution requires suitable treatment of non-equilibrium mass transfer conditions. In this context, microscopic features pertaining to non-equilibrium effects on account of solutal undercooling are incorporated through the formulation of a modified partition-coefficient. The effective partition-coefficient is numerically modelled by means of a number of macroscopically observable parameters related to the solidifying domain. The numerical model is so developed that the modifications on account of non-equilibrium solidification considerations can be conveniently implemented in existing numerical codes based on equilibrium solidification considerations.