Cold and Hot Forming Procedures for Alloy 718

Document identifier: oai:DiVA.org:ltu-76242
Keyword: Engineering and Technology, Materials Engineering, Metallurgy and Metallic Materials, Teknik och teknologier, Materialteknik, Metallurgi och metalliska material, Alloy 718, Hot forming, Material characterization, Solid Mechanics, Hållfasthetslära
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 9 Industry, innovation and infrastructureSDG 11 Sustainable cities and communities
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

Since the past few decades, superalloys have had an important role in the reduction of fuel consumption and carbon dioxide emissions for the transportation sector due to major concerns about climate change and more restrictive environmental laws. Advanced manufacturing methods in nickel-based superalloy aero-engine components allow lightweight designs with a reduced product cost and weight while increasing the efficiency of the engine. However, the prediction of the final geometry of a hot-formed part remains a challenge. In this work, a double-curved sheet-metal component in alloy 718 is studied. The material is characterized at 20°C and 900°C. The predicted shape deviation of the part when considering the anisotropic Barlat Yld2000-2D material model with data at both temperatures is discussed. The effect of including data from stress-relaxation tests at 900°C on the simulated springback is assessed. A hot-forming test is performed at around 900°C to validate the FE simulations regarding springback, strain levels, forming temperatures, and press forces. The results show the significance in considering the input data at high temperatures along with the stress-relaxation behaviour at different strain levels to accurately predict the final geometry of the component.

Authors

Lluís Pérez Caro

Luleå tekniska universitet; Material- och solidmekanik; RISE IVF AB, Vällaregatan 30, 293 38 Olofström, Sweden
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Eva-Lis Odenberger

Luleå tekniska universitet; Material- och solidmekanik; RISE IVF AB, Vällaregatan 30, 293 38 Olofström, Sweden
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Mats Oldenburg

Luleå tekniska universitet; Material- och solidmekanik
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