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Dwell effects on low cycle fatigue behaviour of diffusion coated nickel base superalloy IN 713LC at temperature of 800° C
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SYSNO ASEP 0444732 Document Type A - Abstract R&D Document Type Není vybrán druh dokumentu Title Dwell effects on low cycle fatigue behaviour of diffusion coated nickel base superalloy IN 713LC at temperature of 800° C Author(s) Šulák, Ivo (UFM-A) ORCID
Obrtlík, Karel (UFM-A) RID, ORCID
Hutařová, S. (CZ)
Juliš, M. (CZ)
Podrábský, T. (CZ)
Čelko, L. (CZ)Number of authors 6 Source Title Book of Abstracts. - Karlsruhe : Karlsruhe Institute of Technology, 2015 / Eifler D. ; Heilmaier M. ; Kraft O. ; Löhe D.
S. 382-382Number of pages 1 s. Publication form Online - E Action ICM12 - International Conference on the Mechanical Behavior of Materials /12./ Event date 10.05.2015-14.05.2015 VEvent location Karlsruhe Country DE - Germany Event type WRD Language eng - English Country DE - Germany Keywords High temperature ; Low cycle fatigue ; Dwell time ; Diffusion coatings ; Inconel 713LC Subject RIV JL - Materials Fatigue, Friction Mechanics R&D Projects EE2.3.20.0214 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA15-20991S GA ČR - Czech Science Foundation (CSF) TA04011525 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support UFM-A - RVO:68081723 Annotation Materials used for high temperature applications in gas turbine engines are exceptional due to their resistance to mechanical and thermal loading as well as resilience against chemical attacks by high temperature oxidation. First generation Ni-base superalloy IN 713LC is the representative of cast materials used for these purposes. However, the continuously enhancing of operating temperatures severely degrades the material surface and adversely affects the strength properties. Protecting the surface and prevention of its degradation is a major goal of today and tomorrow. Diffusion coatings are used to safeguard the material from aggressive environments and to improve oxidation stability of surface. The theme of the presented paper is focused on the study of low cycle fatigue with tension dwells of cast nickel-base superalloy IN 713LC with Al-Cr difussion coating at 800 °C. Attention is paid to the microstructure observation of the substrate material and Al-Cr diffusion layer. For purpose of this work a cylindrical specimens were cut from the rods manufactured using investment castings. Low cycle fatigue tests and tests with a 10 minut tension dwells included in each cycle were conducted in strain control mode with constant total strain amplitude at 800 °C. The fatigue behaviour was assessed by cyclic hardening/softening curves, cyclic stress-strain curves, Manson-Coffin curves and Basquin curves. The substrate and the Al-Cr coating was analysed in as-received conditions and also after cyclic loading by means of optical microscopy, as well as SEM, energy dispersive spectroscopy (EDS) and Knoop microhardness in terms of coating`s thickness, morphology, composition and hardness. Microstructure of the Al-Cr layer comprises an outer and an inner diffusion layer where is dispersed a large amount of complex particles based on Cr, Mo and Nb. During the tests rafting of precipitates occurred in the substrate. The diffusion layer remained unchanged. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2016 Electronic address http://icm12.com/wp-content/uploads/2015/05/Book_of_Abstracts_ICM12.pdf
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