James, William SeanGanguly, SupriyoRodrigues Pardal, Goncalo2023-01-262023-01-262023-01-11James W, Ganguly S, Rodrigues Pardal G. (2023) High‑temperature failure and microstructural investigation of wire‑arc additive manufactured Rene 41, The International Journal of Advanced Manufacturing Technology, Volume 125, Issue 5-6, March 2023, pp. 2485–25010268-3768https://doi.org/10.1007/s00170-023-10885-5https://dspace.lib.cranfield.ac.uk/handle/1826/19016In developing a wire-arc plasma direct energy deposition process for creep-resistant alloys used in high-speed flight applications, structures were built from nickel-based superalloy Rene 41. Samples of additive manufacturing (AM) material were analysed for their microstructural and mechanical properties, in both as-deposited (AD) and heat-treated (HT) conditions. Tensile specimens were tested at room temperature, 538, 760, and 1000 °C. Macroscopically, large columnar grains made up of a typical dendritic structure were observed. Microscopically, significant segregation of heavier elements, grain boundary precipitates, and secondary phases were observed, with key differences observed in HT material. There was a clear distinction between failure modes at different testing temperatures and between AD and HT variants. A fractographic investigation found a progressive move from brittle to ductile fracture with increasing testing temperature in both AD and HT conditions, as well as microstructural features which support this observation.enAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Additive manufacturingDirect energy depositionMechanical propertiesFractographyMicrostructureRene 41Article1433-3015