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Advanced thermal gradient mechanical fatigue testing of CMSX-4 with an oxidation protection coating

Baufeld, Bernd and Bartsch, Marion and Heinzelmann, Michael (2007) Advanced thermal gradient mechanical fatigue testing of CMSX-4 with an oxidation protection coating. International Journal of Fatigue, 30 (2), pp. 219-225. doi: 10.1016/j.ijfatigue.2007.01.034.

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Official URL: http://www.elsevier.com/locate/ijfatigue


Frequently, turbine blades are cooled internally, which generates thermal gradients over the blade wall and, consequently, multi-axial stresses in addition to stresses due to centrifugal forces. In order to study these conditions, a new thermal gradient mechanical fatigue (TGMF) testing equipment with a lamp furnace has been developed. The advantages of this furnace are high power (16 lamps a 1000 W), controlled thermal gradients, high heating and cooling rates, and lamp lives exceeding 8000 thermal cycles. The studied material system was the single-crystalline superalloy CMSX-4 with a NiPtAl oxidation protection coating. Different TGMF tests with a maximal surface temperature of 1050C, mechanical loads up to 400 MPa, and cycle numbers up to 9000 resulted in microstructural changes and defects, reflecting in each case the particular temperature, thermal gradient, and local stresses. For example, phase evolution of the metal coatings and rafting of the g/g0 substrate morphology was investigated. Furthermore, cracks at the inner specimen surface and at substrate pores were detected. The observed morphology and defects were related to the applied thermomechanical loads using finite element calculations.

Item URL in elib:https://elib.dlr.de/50306/
Document Type:Article
Title:Advanced thermal gradient mechanical fatigue testing of CMSX-4 with an oxidation protection coating
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Baufeld, BerndKatholieke Universiteit Leuven, BelgiumUNSPECIFIEDUNSPECIFIED
Heinzelmann, MichaelUniversity of Applied Sciences, Bonn-Rhein-Sieg, GermanyUNSPECIFIEDUNSPECIFIED
Date:March 2007
Journal or Publication Title:International Journal of Fatigue
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 219-225
Keywords:Defects; Cracks; Stress analysis; Superalloys; Thermomechanical fatigue/cycling
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:16 Nov 2007
Last Modified:27 Apr 2009 14:08

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