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Dahmen, T.
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Publications (7/7 displayed)
- 2024Integration of spray-formed AISI H13 overspray powder in additive manufacturing to enable a circular ecosystem
- 2023Aging 17-4 PH martensitic stainless steel prior to hardening: effects on martensitic transformation, microstructure and propertiescitations
- 2021Densification, microstructure, and mechanical properties of heat-treated MAR-M247 fabricated by Binder Jettingcitations
- 2021Densification, microstructure, and mechanical properties of heat-treated MAR-M247 fabricated by Binder Jettingcitations
- 2020Characterization of channels made by laser powder bed fusion and binder jetting using X-ray CT and image analysiscitations
- 2020X-ray CT and image analysis methodology for local roughness characterization in cooling channels made by metal additive manufacturingcitations
- 2019Build orientation effects on the roughness of SLM channels
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article
Densification, microstructure, and mechanical properties of heat-treated MAR-M247 fabricated by Binder Jetting
Abstract
<p>Additive Manufacturing (AM) enables the design of complex part geometries for high-temperature applications. Laser Powder Bed Fusion or Direct Energy Deposition of the nickel-based superalloy MAR-M247 poses a challenge in AM due to its poor weldability. Binder Jetting does not utilize a heat source and interaction with a liquid metal during build-up and thus has the potential to overcome this limitation. In this study, MAR-M247 was manufactured by Binder Jetting and subsequently characterized regarding density and microstructure. Combinations of two different Hot-Isostatic-Pressing (HIP) treatments (T = 1120–1180 °C, p = 1000–1500 bar, t = 4 h) and four different heat-treatments involving solution treatment (T = 1250 °C, t = 4 h) and different aging steps (T = 700–1000 °C, t = 12–24 h) were applied to study the densification and microstructural evolution of binder-jetted MAR-M247. The influence of the build direction in combination with HIP is studied concerning the resulting density and mechanical properties at room temperature. The results show that close-to-full densification can be achieved after HIP. Subsequent solution treatment and double-aging after HIP lead to a favorable bimodal microstructure. A process chain for binder-jetted MAR-M247 is presented, which yields tensile properties comparable to those of analogously post-processed cast material. Further possibilities of microstructural optimization and the design philosophy are discussed in the light of the Binder Jetting process-chain.</p>