Phase evolution in an MCrAlY coating during high temperature exposure
MCrAlY (M = Ni and/or Co) coating systems are often applied on gas turbine blades and vanes to withstand the challenges of severe conditions. During service MCrAlY coatings are subjected to microstructural transformations that can be an indication of components service temperatures. The developme...
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| Format: | Article |
| Language: | English |
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University of Belgrade, Technical Faculty, Bor
2012-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2012/1450-53391200045C.pdf |
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| author | Costa C. Barbareschi E. Guarnone P. Borzone G. |
| author_facet | Costa C. Barbareschi E. Guarnone P. Borzone G. |
| author_sort | Costa C. |
| collection | DOAJ |
| description | MCrAlY (M = Ni and/or Co) coating systems are often applied on gas turbine blades and vanes to withstand the challenges of severe conditions. During service MCrAlY coatings are subjected to microstructural transformations that can be an indication of components service temperatures. The development of indirect methods to measure this parameter is of great concern in the gas turbine “world” due to the impossibility of direct measurements. In the present work the evolution of an MCrAlY coating applied on Rene80 by LPPS (Low Pressure Plasma Spray) technique has been studied in order to verify if it was possible to identify a microstructural indicator of the service temperature. The specimens were exposed for different lengths of time at test temperatures of 700 - 800 - in order to characterize the phase evolution with time and temperature. Selective etching was employed for optical metallographic investigation. Scanning Electron Microscopy (SEM) observation combined with Electron Backscattered Diffraction (EBSD) and Energy Dispersive Spectroscopy (EDS) showed that the coating is composed of a γ- Co matrix, β-AlNi, σ-(Cr, Co), Cr carbide and Y-rich phases. Among these phases, the sigma phase resulted in a temperature - composition dependence that can be a useful tool for evaluating the local service temperature and modelling the residual lifetime. |
| format | Article |
| id | doaj-art-ec975f6a93194ff38f99077455ff681b |
| institution | Kabale University |
| issn | 1450-5339 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | University of Belgrade, Technical Faculty, Bor |
| record_format | Article |
| series | Journal of Mining and Metallurgy. Section B: Metallurgy |
| spelling | doaj-art-ec975f6a93194ff38f99077455ff681b2025-02-02T21:02:03ZengUniversity of Belgrade, Technical Faculty, BorJournal of Mining and Metallurgy. Section B: Metallurgy1450-53392012-01-0148335936510.2298/JMMB120705045CPhase evolution in an MCrAlY coating during high temperature exposureCosta C.Barbareschi E.Guarnone P.Borzone G.MCrAlY (M = Ni and/or Co) coating systems are often applied on gas turbine blades and vanes to withstand the challenges of severe conditions. During service MCrAlY coatings are subjected to microstructural transformations that can be an indication of components service temperatures. The development of indirect methods to measure this parameter is of great concern in the gas turbine “world” due to the impossibility of direct measurements. In the present work the evolution of an MCrAlY coating applied on Rene80 by LPPS (Low Pressure Plasma Spray) technique has been studied in order to verify if it was possible to identify a microstructural indicator of the service temperature. The specimens were exposed for different lengths of time at test temperatures of 700 - 800 - in order to characterize the phase evolution with time and temperature. Selective etching was employed for optical metallographic investigation. Scanning Electron Microscopy (SEM) observation combined with Electron Backscattered Diffraction (EBSD) and Energy Dispersive Spectroscopy (EDS) showed that the coating is composed of a γ- Co matrix, β-AlNi, σ-(Cr, Co), Cr carbide and Y-rich phases. Among these phases, the sigma phase resulted in a temperature - composition dependence that can be a useful tool for evaluating the local service temperature and modelling the residual lifetime.http://www.doiserbia.nb.rs/img/doi/1450-5339/2012/1450-53391200045C.pdfMCrAlY coatingphase evolutionsigma phaseservice temperature |
| spellingShingle | Costa C. Barbareschi E. Guarnone P. Borzone G. Phase evolution in an MCrAlY coating during high temperature exposure Journal of Mining and Metallurgy. Section B: Metallurgy MCrAlY coating phase evolution sigma phase service temperature |
| title | Phase evolution in an MCrAlY coating during high temperature exposure |
| title_full | Phase evolution in an MCrAlY coating during high temperature exposure |
| title_fullStr | Phase evolution in an MCrAlY coating during high temperature exposure |
| title_full_unstemmed | Phase evolution in an MCrAlY coating during high temperature exposure |
| title_short | Phase evolution in an MCrAlY coating during high temperature exposure |
| title_sort | phase evolution in an mcraly coating during high temperature exposure |
| topic | MCrAlY coating phase evolution sigma phase service temperature |
| url | http://www.doiserbia.nb.rs/img/doi/1450-5339/2012/1450-53391200045C.pdf |
| work_keys_str_mv | AT costac phaseevolutioninanmcralycoatingduringhightemperatureexposure AT barbareschie phaseevolutioninanmcralycoatingduringhightemperatureexposure AT guarnonep phaseevolutioninanmcralycoatingduringhightemperatureexposure AT borzoneg phaseevolutioninanmcralycoatingduringhightemperatureexposure |