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Fatigue Testing of Ni-based Superalloys for Gas Turbine Blades

Meid, Carla and Kostka, Aleksander and Bartsch, Marion (2016) Fatigue Testing of Ni-based Superalloys for Gas Turbine Blades. HELSMAC (HELmholtz Symposium on Materials and Coatings for High Temperature), 07.-08. April 2016, Cambridge, England.

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Single crystal Ni-base superalloys are used for turbine blades in aero engines and stationary gas turbines, where they operate under complex loading conditions, i.e. high temperature and complex stress state. The microstructure that provides high strength and high resistance against creep and fatigue is the well-known γ / γ’ microstructure with cubic γ’-precipitates separated by γ-channels, which is achieved by adding alloying elements and a stepwise solid solution annealing treatment. While in the γ’-phase Al, Ti, and Ta segregate, forming Ni3Al (Ni3Ti), solid solution strengthening of the γ-channels is provided by enrichment of Co, Cr, Re, and W [1,2]. During longer exposure at high temperatures, these strengthening elements also have the tendency to form undesired brittle phases, such as the so called TCP (topologically closed packed) phases namely the σ, μ, or Laves phase. TCP phases can have a deleterious effect on the creep properties of superalloys [3] and influence the fatigue properties (in thermal mechanical fatigue) due to the depletion of the γ matrix of strengthening elements in the vicinity of the TCP-phases [4]. However, observations made in high temperature fatigue experiments indicate that formation of TCP-phases may have beneficial effects on the evolution of fatigue damages. In this contribution, the influence of TCP phases on the crack propagation during high temperature fatigue tests has been investigated and will be discussed.

Item URL in elib:https://elib.dlr.de/108265/
Document Type:Conference or Workshop Item (Poster)
Title:Fatigue Testing of Ni-based Superalloys for Gas Turbine Blades
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Kostka, AleksanderRuhr-Universität BochumUNSPECIFIEDUNSPECIFIED
Date:7 April 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Nickelbasis-Superlegierung, Ermüdung, Hochtemperaturverhalten
Event Title:HELSMAC (HELmholtz Symposium on Materials and Coatings for High Temperature)
Event Location:Cambridge, England
Event Type:international Conference
Event Dates:07.-08. April 2016
Organizer:Helmholtz Association, The Gordon Laboratory
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Meid, Carla
Deposited On:28 Nov 2016 07:30
Last Modified:01 Dec 2016 14:32

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