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Simulation of the influence of forming on residual stresses and deformations after welding and heat treatment in Alloy 718
Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). GKN Aerospace Sweden. (PTW)ORCID-id: 0000-0001-7169-7069
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för maskinteknik. (PTW)ORCID-id: 0000-0002-5824-7474
2014 (Engelska)Ingår i: / [ed] E. Oñate, J. Oliver and A. Huerta, International Center for Numerical Methods in Engineering (CIMNE), 2014, s. 1657-1666Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Abstract [en]

Manufacturing of components in aero engines requires attention to residual stress and final shape of the product in order to meet high quality product standards. This sets very high demands on involved manufacturing steps. The manufacturing of a V-shaped leading edge of a vane is simulated. It is made of Alloy718, which is a nickel based heat resistant material commonly used in aerospace components. The manufacturing process chain consists of forming, welding and heat treatment. The results show that the remaining residual stresses after a manufacturing process chain are affected when the residual history from the formingprocess is considered. The residual stress decrease after heat treatment is about 55-65%. Moreover, the von Mises stress profile through thickness at the centre of the radius at the weld joint is about 25% higher when full forming history is considered.

Ort, förlag, år, upplaga, sidor
International Center for Numerical Methods in Engineering (CIMNE), 2014. s. 1657-1666
Nyckelord [en]
Manufacturing process chain, Forming, Welding, Heat treatment, Residual stresses, Alloy 718
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik Annan maskinteknik Metallurgi och metalliska material
Forskningsämne
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-7109ISI: 000353626502018Scopus ID: 2-s2.0-84923973244ISBN: 9788494284472 (digital)OAI: oai:DiVA.org:hv-7109DiVA, id: diva2:770456
Konferens
11th World Congress on Computational Mechanics (WCCM XI) 5th European Conference on Computational Mechanics (ECCM V) 6th European Conference on Computational Fluid Dynamics (ECFD VI)
Tillgänglig från: 2014-12-10 Skapad: 2014-12-10 Senast uppdaterad: 2020-02-21Bibliografiskt granskad
Ingår i avhandling
1. Process chain simulation of forming, welding and heat treatment of Alloy 718
Öppna denna publikation i ny flik eller fönster >>Process chain simulation of forming, welding and heat treatment of Alloy 718
2017 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Manufacturing of aero engine components requires attention to residual stress and final shape of the product in order to meet high quality product standards.This sets very high demands on involved manufacturing steps to meet design requirements. Simulation of manufacturing processes can therefore be animportant tool to contribute to quality assurance.The focus in this work is on simulation of a manufacturing process chain comprising of sheet metal forming, welding and a stress relief heat treatment.Simulation of sheet metal forming can be used to design a forming tool design that accounts for the material behaviour, e.g. spring back, and avoid problems such as wrinkling, thinning and cracking. Moreover, the simulation can also show how the material is stretched and work hardened. The residual stresses after forming may be of local character or global depending on the shape that is formed. However, the heat affected zone due to welding is located near the weld.The weld also causes large residual stresses with the major component along the weld. It is found that the magnitude of the residual stresses after welding is affected by remaining stresses from the previous sheet metal forming. The final stress relieve treatment will relax these residual stresses caused by e.g. forming and welding. However, this causes additional deformations.The main focus of this study is on how a manufacturing process step affects the subsequent step when manufacturing a component of the nickel-based super alloy 718. The chosen route and geometry is a simplified leading edge of an exhaust case guide vane. The simulations were validated versus experiments. The computed deformations were compared with measurements after each manufacturing step. The overall agreement between experiments and measurement was good. However, not sufficiently accurate considering the required tolerance of the component. It was found from simulations that the residual stresses after each process affects the subsequent step. After a complete manufacturing process chain which ends with a stress relief heat treatment the residual stresses were not negligible. VIII Special experiments were performed for studying the stress relief in order to understand how the stresses evolve through the heat treatment cycle during relaxation. It was found that the stresses were reduced already during the beginning of the heating up sequence due to decreasing Young´s modulus and yield stress with increasing temperature. Relaxation due to creep starts when a certain temperature was reached which gave a permanent stress relief.

Ort, förlag, år, upplaga, sidor
Trollhättan: University West, 2017. s. 44
Serie
Licentiate Thesis: University West ; 17
Nyckelord
Forming, Welding, Stress relieve annealing, Heat treatment, Finite Element Simulation, Manufacturing process chain, Alloy 718
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-10917 (URN)978-91-87531-54-5 (ISBN)978-91-87531-53-8 (ISBN)
Handledare
Tillgänglig från: 2017-05-12 Skapad: 2017-04-24 Senast uppdaterad: 2019-12-05

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Steffenburg-Nordenström, JoachimLarsson, Mats

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