60 research outputs found
ΠΠ»Π°ΡΡΠΈΡΠΈΠΊΠ°ΡΠΈΡ Π·ΠΎΠ»ΠΎΡΠΎΠ½ΠΎΡΠ½ΡΡ ΡΡΠ΄Π½ΠΎ-ΠΌΠ°Π³ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ ΡΠΈΡΡΠ΅ΠΌ Π³ΡΠ°Π½ΠΈΡΠΎΠΈΠ΄Π½ΠΎΠ³ΠΎ ΡΡΠ΄Π°
Π ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΈ ΡΡΠ΅Ρ ΠΎΠ±ΠΌΠΎΡΠΎΡΠ½ΡΡ ΡΡΠ°Π½ΡΡΠΎΡΠΌΠ°ΡΠΎΡΠΎΠ² ΡΠΎΠΊΠ° Π΄Π»Ρ ΠΏΠΈΡΠ°Π½ΠΈΡ ΡΠ΅ΠΏΠ΅ΠΉ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΠΎΠ³ΠΎ ΡΠΎΠΊΠ°
Geometry Effect on Microstructure and Mechanical Properties in Laser Powder Bed Fusion of Ti-6Al-4V
Laser Powder Bed Fusion (LPBF) of Ti-6Al-4V enables the manufacturing of complex parts for lightweight applications. The emerging microstructure in the LPBF process and thus the mechanical properties are defined by the thermal cycles, which are locally variable for complex geometries. Predictions of local mechanical properties by simulation would reduce the development time of new applications drastically but are today not possible on part scale, so new part applications must be qualified experimentally at great effort. In this study, representative geometry sections were transferred into a simplified sample shape to mechanically characterize different geometry-dependent microstructures. In areas exposed to comparatively increased heat input over time, a lamellar Ξ± + Ξ² microstructure with Ξ² fraction up to 20% was measured in contrast to the common martensitic Ξ±β² microstructure of LPBF-manufactured Ti-6Al-4V, resulting in reduced tensile strength and fatigue life. For the first time, a correlation was successfully established between ultimate tensile strength of multiple geometries and the corresponding temperatureβtime cycles. With reduced computational effort by use of simplifying assumptions in the simulation, this correlation model can theoretically be applied to the part level. This work has laid the foundation for the simulation-based prediction of mechanical properties for entire parts manufactured with LPBF
Randschichtlegieren von Aluminiumwerkstoffen mit Laserstrahlung : physikalische Prozesse, Modelle und Integrationsverfahren
Randschichtlegieren von Aluminiumwerkstoffen mit Laserstrahlung : physikalische Prozesse, Modelle und Integrationsverfahren
Investigation on the mechanism of surface structure formation during laser remelting with modulated laser power on tool steel H11
3D simulation of surface tension driven interdendritic convection and microsegregation during laser surface alloying
3D simulation of surface tension driven interdendritic convection and microsegregation during laser surface alloying
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