Influence of Interlayer Temperature and Heat Treatment on the Microstructure and Mechanical Properties of Duplex Steel 2209 processed with wire laser additive manufacturing

Kurzfassung

The DiMad project investigates the influence of build height and interlayer temperature (ILT) on the microstructure and mechanical properties of wire-based laser additive manufactured (WLAM) 2209 duplex stainless steel. The results show that an ILT of 200 °C promotes a more balanced austenite-ferrite phase distribution and increases hardness, yield strength, and tensile strength, while slightly reducing uniform elongation. Subsequent heat treatments dissolve meltpool structures, promote austenite grain growth, and improve microstructural homogeneity, accompanied by an approximately 10% reduction in hardness. The integration of experimental characterization data, thermal and microstructural simulations, and structured data management within the DiMad triple store provides a foundation for establishing transferable process-microstructure-property relationships. Future work will focus on validating numerical simulations and investigating the transferability of the findings to demonstrator components with varying build and scan strategies.