Superior tensile and fatigue properties of Incoloy 901 repair welds produced by direct energy deposition

Article Materials Science, Multidisciplinary

Alloys-by-design: Application to new superalloys for additive manufacturing

Yuanbo T. Tang et al.

Summary: New grades of gamma/gamma' nickel-based superalloy for the additive manufacturing process were designed using computational approaches, with processing trials carried out using powder-based selective laser melting. The superior processability and mechanical behaviour of the new alloys were demonstrated through microstructural characterisation, calorimetry and hot tensile testing. Suggestions for refinements to the modelling approach were also made.

ACTA MATERIALIA (2021)

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Article Nanoscience & Nanotechnology

Uncommon Cr-rich γ′ precipitation during creep at 950 °C in Inconel 617 superalloy with serrated grain boundaries through pre-straining

Jiwon Lee et al.

Summary: Pre-straining of a Ni-based solid-solution-strengthened superalloy with serrated grain boundaries promotes the formation of rare nano-sized Ni3Al phase at 950 degrees C, rather than the predicted Ti(C,N) phase. Atom probe tomography revealed that the nano-sized precipitate is a unique γ' phase partitioned by over 14% of Cr atoms.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2021)

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Article Materials Science, Multidisciplinary

A novel method to prevent cracking in directed energy deposition of Inconel 738 by in-situ doping Inconel 718

Xiaoqiang Zhang et al.

Summary: In the DED process of Inconel 738, in-situ doping a small amount of Inconel 718 between deposited layers can effectively prevent cracking, improve strength and plasticity, and enhance the printability of unweldable superalloys in additive manufacturing.

MATERIALS & DESIGN (2021)

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Article Nanoscience & Nanotechnology

Analysis of microstructure and mechanical properties of additive repaired Ti-6Al-4V by Direct Energy Deposition

Sulochana Shrestha et al.

Summary: The recent advances in additive manufacturing have created new possibilities in repairing aerospace components, with a focus on evaluating the microstructural characteristics, mechanical properties, and fatigue behavior of additively repaired specimens. The study found that the mechanical properties of DED repaired Ti-6Al-4V were slightly lower than the stock material but compared favorably to annealed Ti-6Al-4V.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (2021)

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Review Materials Science, Multidisciplinary