Dimensionless enthalpy as characteristic factor for process control in laser powder bed fusionThursday (25.06.2020) 17:00 - 17:20 Room 1
While volume energy density (VED) is often used for process development in laser powder bed fusion (LPBF), its usefulness has limitations regarding comparability of materials from different alloying groups as it does not contain physical material parameters. To overcome this disadvantage, dimensionless enthalpy could provide a better characteristic factor for process control. Dimensionless enthalpy relates the absorbed energy of a material during laser welding to its enthalpy necessary for melting and was found suitable to describe the relationship between process parameters and melt pool morphologies for a range of alloys in laser welding. The question arises, whether those findings are also valid in LPBF. In contrast to laser welding, LPBF requires taking into account further boundary conditions such as the powder bed as well as gas flow within the process chamber. Therefore, the transferability of dimensionless enthalpy as characteristic factor for determination of melt pool morphology as well as stability in LPBF is investigated here. Experiments were done for two common LPBF alloys IN718 and MS1 taking into account peculiarities of the LPBF process, such as scan orientation and build plate to flow location.
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