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Effect of porosity and eutectics on the high-temperature low-cycle fatigue Performance of a nickel-base single-crystal superalloy

Ruttert, Benjamin and Meid, Carla and Mujica Roncery, Lais and Lopez-Galilea, Inmaculada and Bartsch, Marion and Theisen, Werner (2018) Effect of porosity and eutectics on the high-temperature low-cycle fatigue Performance of a nickel-base single-crystal superalloy. Scripta Materialia, 155, pp. 139-143. Elsevier. DOI: 10.1016/j.scriptamat.2018.06.036 ISBN ISSN: 1359-6462 ISSN 1359-6462

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Official URL: https://www.sciencedirect.com/science/article/pii/S1359646218304007?via%3Dihub

Abstract

This work investigates the separate influence of porosity and γ/γ′-eutectics on the low-cycle fatigue life of a single-crystal Ni-base superalloy at high temperatures. A conventional vacuum furnace heat-treatment but also integrated heat-treatments in a hot isostatic press are applied to produce different material variants of the same alloy. High-resolution electron microscopy revealed that both pores and γ/γ′-eutectics act as crack starters, thus initiating early failure. Moreover, the results indicate that remaining γ/γ′-eutectics can weaken the fatigue resistance even more than pores. Furthermore, the results confirm the beneficial effect of proper integrated hot isostatic pressing heat-treatments on the fatigue Performance.

Item URL in elib:https://elib.dlr.de/123404/
Document Type:Article
Title:Effect of porosity and eutectics on the high-temperature low-cycle fatigue Performance of a nickel-base single-crystal superalloy
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ruttert, BenjaminRuhr-Universität BochumUNSPECIFIED
Meid, Carlacarla.meid (at) dlr.deUNSPECIFIED
Mujica Roncery, LaisUniversidad Pedagogica y Technologica de ColombiaUNSPECIFIED
Lopez-Galilea, InmaculadaRuhr-Universität BochumUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.dehttps://orcid.org/0000-0002-3952-2928
Theisen, WernerRuhr-Universität BochumUNSPECIFIED
Date:26 June 2018
Journal or Publication Title:Scripta Materialia
Refereed publication:Yes
Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:155
DOI :10.1016/j.scriptamat.2018.06.036
Page Range:pp. 139-143
Publisher:Elsevier
ISSN:1359-6462
ISBN:ISSN: 1359-6462
Status:Published
Keywords:Electron backscatter diffraction (EBSD); Hot isostatic pressing (HIP); Low-cycle fatigue; Microstructure; Single-crystal superalloy
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
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:20 Nov 2018 09:04
Last Modified:25 Jun 2019 16:52

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