MechanicalProperty
subclass of: Characteristic
comment: Mechanical properties of the produced part

TemperatureDifference
subclass of: ConsolidationPhysicalProperty
subclass of: Restriction
  on property: influences
  some values from: MaximumFluidVelocity
subclass of: Restriction
  on property: influences
  some values from: SurfaceTension
comment: Difference between temperature on the top of the melt pool and the solidus temperature

Keyhole-mode laser melting
comment: Laser powder-bed fusion additive manufacturing of metals employs high-power focused laser beams. Typically, the depth of the molten pool is controlled by conduction of heat in the underlying solid material. But, under certain conditions, the mechanism of melting can change from conduction to so-called “keyhole-mode” laser melting. In this mode, the depth of the molten pool is controlled by evaporation of the metal. Keyhole-mode laser melting results in melt pool depths that can be much deeper than observed in conduction mode. In addition, the collapse of the vapor cavity that is formed by the evaporation of the metal can result in a trail of voids in the wake of the laser beam. In the following paper (Observation of keyhole-mode laser melting in laser powder-bed fusion additive manufacturing), the experimental observation of keyhole-mode laser melting in a laser powder-bed fusion additive manufacturing setting for 316L stainless steel is presented. The conditions required to transition from conduction controlled melting to keyhole-mode melting are identified.