SLM metal powder forming is a proce

SLM metal powder forming is a process involving complex physical and chemical reactions, including the absorption of laser energy by metal, the thermal conduction between liquid and solid metal phases, thermal convection, phase transition, and the flow of molten pool. When the laser power must be, with the increase of the scanning speed, the energy of the metal receiving the laser beam in unit area will be less, and the metal powder near the melting pool will penetrate into the melting pool less, and the melting area will become narrower, so the width and height of the melting channel will naturally decrease. When the scanning speed is constant, the laser power increases, the laser energy density increases, the influence of the surrounding temperature field increases, the molten pool area increases, and the metal powder entering the molten pool also increases, so the width and height of the molten pool increase. However, when the laser power is too high, the surface tension of the liquid metal cannot keep a balance with its own gravity, so it will flow out to both sides, resulting in a wider channel and a narrower channel until the two reach a balance again