PSI - Issue 13

ScienceDirect Available online at www.sciencedirect.com Av ilable o line at ww.sciencedire t.com ienceDirect Structural Integrity Procedia 00 (2016) 000 – 000 Procedia Structu al Integrity 13 (2018) 831–836 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Int grity 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 Fatigue Crack Growth Behavior and Associated Microstructure in a Metastable High-Entropy Alloy Takeshi Eguchi a, *, Motomichi Koyama a , Yoshihiro Fukushima a , Cemal Cem Tas n b , Kaneaki Tsuzaki a a Department of Mechanical Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan b Department of Materials Science and Engineering, Massachusettes Institute of Technology, 77 Massachusettes Avenue, Cambridge, MA 02139, USA High-entropy alloys (HEAs) containing different kinds of high-concentration solute atoms provide new concepts for obtaining excellent balance of strength and ductility. In particular, a metastable dual-phase HEA (Fe30Mn10Cr10Co; FCC matrix and HCP second phase) shows superior ductility and strength owing to the transformation-induced plasticity effect associated with deformation-induced HCP-martensitic transformation. In this context, the fatigue properties of metastable HEAs are to be investigated towards practical applications as structure materials. In this study, the fatigue crack growth behaviors of HEA and type 316L austenitic stainless steel (FCC single phase) were comparatively examined. The crack growth rate of HEA was comparable to that of 316L. In HEA, the fatigue crack was covered by a large amount of HCP-martensite. In general, the HCP-martensite was cracked easily because of the smaller number of slip systems. However, the negative effect of HCP-martensite did not appear in the fatigue crack growth rate of HEA. By electron channeling contrast imaging, we found that the HCP-martensite beneath the fracture surface contained significant orientation gradient and high density of dislocations, indicating that HCP-martensite in the present Fe30Mn10Cr10Co HEA had high plastic deformability and associated stress accommodation capacity. © 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. ECF22 - Loading and Environmental effects on Structural Integrity Fatigue Crack Growth Behavior and Associated Microstructure in a Metastable High-Entropy Alloy Takeshi Eguchi a, *, Motomichi Koyama a , Yoshihiro Fukushima a , Cemal Cem Tasan b , Kaneaki Tsuzaki a a Department of Mechanical Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan b Department of Materials Science and Engineeri g, Massach ettes Institute of Technology, 77 Massa husettes Avenue, Cambridge, MA 02139, USA Abstract High-entropy alloys (HEAs) containing different kinds of high-concentration solute atoms provide new concepts for obtaining excellent balance of strength and ductility. In particular, a metastable dual-phase HEA (Fe30Mn10Cr10Co; FCC matrix and HCP se ond ph se) sh ws superior ductility a d strength owing to the transformation-induced plasticity effect associate with d f rmation-induced HCP-martensitic transformation. In this cont xt, the fatigue properties of metastable HEAs r to be investigated towards practical pplications a structure material . In this study, the fatigue crack gr wth behaviors of HEA and typ 316L austenitic stainless steel (FCC single phase) were comparatively examined. The crack growth rate of HEA was comparabl to that of 316L. In HEA, th fatigue crack was cover d by a large amount of HCP-martensite. In general, the HCP-martensite was cracked easily because of the smaller number of slip systems. However, the negative effect of HCP-martensite did not app ar in the fatigue crack growth rat of HEA. By electron channeling contrast imaging, we found that the HCP-martensite beneath the fracture surface contained significant orientation gradient and high density of dislocations, indicating that HCP-martensite in t present Fe30Mn10Cr10Co HEA h d high plastic deformability and associated stress accommodatio capacity. © 2018 The Au hors. Published by Elsevier B.V. Peer-review under responsibility of the ECF22 orga izers. Abstract

© 2016 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Scientific Committee of PCF 2016. Keywords: High-entropy alloy; HCP-martensite; Fatigue; Crack growth behavior. Keywords: High-entropy alloy; HCP-martensite; Fatigue; Crack growth behavior.

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

* Corresponding author. Tel.: +81-92-802-3288. E-mail address: 2TE17803T@s.kyushu-u.ac.jp * Corresponding author. Tel.: +81-92-802-3288. E-mail ad ress: 2TE17803T@s.kyushu u.ac.jp

* 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.

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.2018.12.159