PSI - Issue 14

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XV Portuguese Conference on Fracture, PCF 2016, 10-12 February 2016, Paço de Arcos, Portugal Thermo-mechanical modeling of a high pressure turbine blade of an airplane gas turbine engine P. Brandão a , V. Infante b , A.M. Deus c * a Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal b IDMEC, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal c CeFEMA, Department of Mechanical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, 1049-001 Lisboa, Portugal Abstract During their operation, modern aircraft engine components are subjected to increasingly demanding operating conditions, especially the high pressure turbine (HPT) blades. Such conditions cause these parts to undergo different types of time-dependent degradation, one of which is creep. A model using the finite element method (FEM) was developed, in order to be able to predict the creep behaviour of HPT blades. Flight data records (FDR) for a specific aircraft, provided by a commercial aviation company, were used to obtain thermal and mechanical data for three different flight cycles. In order to create the 3D model needed for the FEM analysis, a HPT blade scrap was scanned, and its chemical composition and material properties were obtained. The data that was gathered was fed into the FEM model and different simulations were run, first with a simplified 3D rectangular block shape, in order to better establish the model, and then with the real 3D mesh obtained from the blade scrap. The overall expected behaviour in terms of displacement was observed, in particular at the trailing edge of the blade. Therefore such a model can be useful in the goal of predicting turbine blade life, given a set of FDR data. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2nd International Conference on Structural Integrity and Exhibition 2018 Investigation of hot corrosion resistance of bare and Ni-20%Cr coated superalloy 825 to Na 2 SO 4 -60%V O 5 environment at 900°C S.M.Muthu a , M.Arivarasu b *, N.Arivazhagan a , M.Nageswara rao a a School of Mechanical Engineering, Vellore Institute of Technology, Vellore-632014, India b* Center for Innovative Manufacturing Research, Vellore Institute of Technology, Vellore-632014. India Abstract The present study aims to compare the h t corrosion resista ce of bare and Ni-20%Cr coated Ni-Fe based superalloy 825 in Na 2 SO 4 -60%V 2 O 5 molten salt environment at 900°C. Superalloy 825 was thermal spray coated with Ni-20%Cr by high velocity oxy-fuel (HVOF) coating process. During hot corrosion study, weight measurement was done at the end of each cycle to obtain the corrosion kinetics by thermogravimetric techniqu . Surface morphology study, surface chemical analysis and phase identification of the corrosion products were carried out using scanning electron microscope, energy dispersive spectroscopy and X-ray diffraction. Cross-sectional analysis was performed on the hot corroded specimens to determine oxide layer thickness and depth of corrosion attack. Elemental distributions on the cross-sectioned hot corroded specimens were studied using X-ray mapping analysis. The Ni-20%Cr coated specimen showed better corrosion resistance than the bare specimen. Spallation and cracking of scale was observed on the uncoat d specimen with progress of corrosi n reactio . © 2018 The Authors. Published by Elsevier B.V. This is an open-access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Ni-based superalloy 825; Thermal spray coating, Hot corrosion, Thermogravimetric analysis. 1. Introduction Alloy 825 is a titanium stabilized nickel-iron based superalloy. It is a candidate material for a wide spectrum of applications; superheaters in waste heat incinerators, nuclear power plants, chemical plant and equipment, nuclear fuel processing, petrochemicals, oil and gas. The alloy has superior resistance to stress corrosion cracking and 2nd International Conference on Structural Integrity and Exhibition 2018 Investigation of hot corrosion resistance of bare and Ni-20%Cr coated superalloy 825 to Na 2 SO 4 -60%V 2 O 5 environment at 900°C S.M.Muthu a , M.Arivarasu b *, N.Arivazhagan a , M.Nageswara rao a a School of Mechanical Engineering, Vellore Institute of Technology, Vellore-632014, India b* Center for Innovative Manufacturing Research, Vellore Institute of Technology, Vellore-632014. India Abstract The present study aims to compare the ho corrosion resistance of bare and Ni-20%Cr coated Ni-Fe based superalloy 825 in Na 2 SO 4 -60% 2 5 m l e salt environment at 900°C. Superalloy 825 was the mal spray c at d with Ni-20%Cr b high velocity oxy-fuel (HVOF) oating p ocess. During ho c rrosion study, weight measurement was done at the end of each cycle to obtain the corrosion kinetics by thermogravimetric technique. Surface morphology study, surface chemical analysis and ph se identification f the corrosion products were carried out usi g scanning electron microscope, n gy dispersive spectroscopy X-ray diffraction. Cross-sectional an lys was performed on the hot c rro ed specimens to determine oxide lay r thickness and depth of corro on attack. Elemental distribut ons on th cross-se tioned hot corrod d specimens wer studied using X-ray m pp analysis. The Ni-20%Cr coated sp cim n showed better corr sion resistan e than the bare specimen. Spallation and cracking of scale was ob erv d on th uncoated specimen with pr gress of corrosion reaction. © 2018 The Authors. Published by Elsevier B.V. This is an open-access article und r the CC BY-NC-ND lic nse (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. Keywords: Ni-based superalloy 825; Thermal spray coating, Hot corrosion, Thermogravimetric analysis. 1. Introduction Alloy 825 is a titanium tabilized nickel-iron based super lloy. It is candidate material for a wide spectr m of application ; superheaters in waste heat incinerators, nucle r pow r plants, chemical plant and equipment, uclear fuel process ng, petrochemicals, oil and gas. Th alloy has superior resistance to stress corrosion cracking and © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +91 9488982584; fax: +91-416-2243092 . E-mail address: arivarasu.m@vit.ac.in * Corresponding author. Tel.: +91 9488982584; fax: +91-416-2243092 . E-mail address: arivarasu.m@vit.ac.in

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. 2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 10.1016/j.prostr.2019.05.037 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of Peer-review under responsibility of the SICE 2018 organizers. * Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt