1Ph.D student, TarbiatModares University, Department of Materials Engineering, Tehran, Iran
2Full Professor , TarbiatModares University, Department of Materials Engineering, Tehran, Iran
Microstructural changes during laser welding and laser surface treatment has been regarded by many researchers. Most researches have focused on studying the effect of various process parameters on the size and microstructure of the heat affected zone. But some studies show that the initial microstructure of the base metal can also affect the heat affected zone dimensions and final microstructure. In this research, the effect of initial grain size on final microstructure of the heat affected zone in laser surface melting process has been studied. For this purpose we used phase field simulation technique. The results showed that the change in initial grain size can lead to a change in the size of the heat affected zone and grain topology in this area.