PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at www.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 763–768 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural I tegrity Procedia 00 (2018) 000 – 000

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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. ECF22 - Loading and Environmental effects on Structural Integrity The Effect of Microstructure Constituents on the Static and Dynamic Fracture Behavior of High Strength Quenched and Tempered Martensitic Steels Frank Tioguem Teagho a,b *, Matthieu Maziere a , Franck Tankoua b , André Galtier b , Anne-Françoise Gourgues-Lorenzon a a MINES ParisTech – PSL Research University – Centre des Matériaux – UMR CNRS 7633 – BP 87 – 91003 EVRY CEDEX, France. b ASCO Industries – Centre de Recherche CREAS – BP 70045 – avenue de France, 57301 HAGONDANGE CEDEX, France. Abstract The aim of the present work is to contribute to a microstructural-based predictive tool of Charpy impact toughness for the design of new grades of quenched and tempered (QT) martensitic steels. The effect of carbides on the true strain to fracture under uniaxial tension has been extensively studied; but very little attention has been paid yet to the effect of carbides on the upper shelf energy (USE) of QT martensite. The present work focuses on the contribution of microstructural constituents, carbide in particular, to the fracture behavior in the USE domain of the ductile-to-brittle transition curve. A hot-rolled, martensitic 40CrMo4 steel bar, quenched from 875°C and tempered at 600°C was used. In order to keep similar matrix while varying the carbide precipitation state, an additional tempering at either 690°C or 720°C was applied to some specim n blanks. The three matrix microstructures and carbi e populations were characterized in detail. The impact tough ess, M 3 C carbide size and intercarbide spacing were shown to increase wit tempering temperature. Instrumented Charpy impact curves were used to derive the respective contributions of initiation energy and propagation energy to the overall fracture energy of each microstructure. Th propagation en rgy gives a major contribution and a correlation has been proposed with the intercarbide s acing distribution. The reported results shed new light on the effect of carbid size and spatial distribution on the impact toughness be avior in the USE domain of QT martensitic ste ls. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. ECF22 - Loading and Environmental effects on Structural Integrity The Effect of Microstructure Constituents on the Static and Dynamic Fracture Behavior of High Strength Quenched and Tempered Martensitic Steels Frank Tioguem Teagho a,b *, Matthieu Maziere a , Franck Tankoua b , André Galtier b , Anne-Françoise Gourgues-Lorenzon a a MINES ParisTech – PSL Research University – Centre des Matériaux – UMR CNRS 7633 – BP 87 – 91003 EVRY CEDEX, France. b A CO Industries – Centre de Recherche CREAS – BP 70045 – venue de France, 57 01 HAGONDANG CEDEX, France. Abstract The aim of the present work is to contribute to a microstructural-based predictive tool of Charpy impact toughness for the design of new grades of qu nched and tempered (QT) m rtensitic steels. The effect of carbides on the true strain to fracture und r uniaxial tension ha been xtensively studied; but very lit l at ention has b en paid yet to the effect of carbides on the pper shelf energy (USE) of QT martensite. The pres nt work focuses on the contribution of microstructural onstituents, carbide in particular, to the fracture behavior in the USE domai of the du tile-to-brittle transition curve. A hot-rolled, martensitic 40C Mo4 steel bar, quenched om 875°C and tempered at 600°C was used. In rder to keep similar matrix whi varying the carbide precipitation state, an additional tempering at either 69 ° or 720°C was applied to some specimen blanks. The three matrix m crostructures a d carbide populations wer characterized in detail. The impact toughness, M 3 C carbide size and intercarbide spacing were shown to inc eas with tempering t mper ture. Instrumented Charpy impact curve were used to derive the respective contr butions of initiation en rgy and propagation nergy t the overall fracture energy of each microstructure. Th propagation energy gives a maj r contributio and correlation has been propos d with the intercarbide spacing istribution. The reported results sh d new light on the effect of carbide size and spatial distributi n on the impact toughness behavior in he USE domain f QT martensitic st els. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers.

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High strength steel; Martensite; Impact toughness; Carbides; Ductile fracture. Keywords: High strength steel; Martensite; Impact toughness; Carbides; Ductile fracture.

Keywords: High Pressure Turbine Blade; Creep; Finite Element Method; 3D Model; Simulation.

* Corresponding author. Tel.: +351 218419991. E-mail address: amd@tecnico.ulisboa.pt 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 2452-3216 © 2018 The Authors. Published by Elsevier B.V. Peer review under r sponsibility of the ECF22 o ganizers. * Corresponding author. Tel.: +33 (0)1.60.76.30.49 E-mail address: frank.tioguem-teagho@mines-paristech.fr * Corresponding author. Tel.: +33 (0)1.60.76.30.49 E-mail address: frank.tioguem-teagho@mines-paristech.fr

2452-3216 © 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016.

2452-3216  2018 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 organizers. 10.1016/j.prostr.2018.12.126