Springback prediction and validation in hot forming of a double-curved component in alloy 718

Document identifier: oai:DiVA.org:ltu-76204
Access full text here:10.1007/s12289-021-01615-x
Keyword: Engineering and Technology, Teknisk mekanik, Hållfasthetslära, Solid Mechanics, High temperature, Anisotropy, Stress relaxation, Superalloy, Alloy 718, Hot forming, Maskinteknik, Materials Engineering, Applied Mechanics, Mechanical Engineering, Metallurgi och metalliska material, Metallurgy and Metallic Materials, Bearbetnings-, yt- och fogningsteknik, Materialteknik, Teknik och teknologier, Manufacturing, Surface and Joining Technology, Engineering Materials
Publication year: 2021
Relevant Sustainable Development Goals (SDGs):
SDG 11 Sustainable cities and communitiesSDG 9 Industry, innovation and infrastructure
The SDG label(s) above have been assigned by OSDG.ai


The demands associated with the production of advanced parts made of nickel-base superalloys are continuously increasing to meet the requirements of current environmental laws. The use of lightweight components in load-carrying aero-engine structures has the potential to significantly reduce fuel consumption and greenhouse gas emissions. Furthermore, the competitiveness of the aero-engine industry can benefit from reduced production costs and shorter development times while minimizing costly try-outs and increasing the efficiency of engines. The manufacturing process of aero-engine parts in superalloys at temperatures close to 950 °C produces reduced stamping force, residual stresses, and springback compared to traditional forming procedures occurring at room temperature. In this work, a hot forming procedure of a double-curved component in alloy 718 is studied. The mechanical properties of the material are determined between 20 and 1000 °C. The presence and nature of serrations in the stress–strain curves are assessed. The novel version of the anisotropic Barlat Yld2000-2D material model, which allows the input of thermo-mechanical data, is used in LS-DYNA to model the behaviour of the material at high temperatures. The effect of considering the stress-relaxation data on the predicted shape distortions is evaluated. The results show the importance of considering the thermo-mechanical anisotropic properties and stress-relaxation behaviour of the material to predict the final geometry of the component with high accuracy. The implementation of advanced material models in the finite element (FE) analyses, along with precise process conditions, is vital to produce lightweight components in advanced materials of interest to the aerospace industry.


Lluís Pérez Caro

Luleå tekniska universitet; Material- och solidmekanik; RISE IVF AB; Solid Mechanics
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Eva-Lis Odenberger

RISE IVF AB; Solid Mechanics
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Mikael Schill

DYNAmore Nordic AB
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Fredrik Niklasson

GKN Aerospace Sweden AB
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Pia Åkerfeldt

Luleå tekniska universitet; Materialvetenskap; Materialteknik
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Mats Oldenburg

Luleå tekniska universitet; Hållfasthetslära; Solid Mechanics
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