Modeling the Diffusion of Minor Elements in Different MCrAlY-Superalloy Coating/Substrates at High TemperatureShow others and affiliations
2017 (English)In: ENERGY MATERIALS 2017, SPRINGER INT PUBLISHING AG , 2017, p. 251-263Conference paper, Published paper (Refereed)
Abstract [en]
As demands of energy supply have been increased continuously and at the same time the uses of fossil fuel are limited and the greenhouse effect should be minimized, the gas turbine industries have been making efforts to increase gas turbine efficiency and to reduce emissions for power generations. One of the efforts is a continuous development of high temperature capacity of ceramic thermal barrier coatings (TBCs) and metallic MCrAlY overlays. The MCrAlY overlays are used as both protective coatings and bond coats to TBCs on underlying superalloy components in the gas turbines. During high temperature exposure, elemental diffusion occurs between the bond coat and the substrate which can affect the overall coating performance. The present study investigates the diffusion of minor elements like Re, Ta, Si, Mo and Ti in various MCrAlY overlays and superalloy substrates. An oxidation-diffusion model has been used to study the elemental diffusion. The diffusion process contains two stages: beta depletion stage and the b depleted stage. In the stage when MCrAlY overlays exhibit gamma + beta microstructure, the diffusion of minor elements in the coatings was observed to be related to the b depletion rate. After that the diffusion of the minor elements did not show any clear dependence on the coating composition. The development principle of the elemental diffusion is discussed in detail.
Place, publisher, year, edition, pages
SPRINGER INT PUBLISHING AG , 2017. p. 251-263
Series
Minerals Metals & Materials Series, ISSN 2367-1181
Keywords [en]
MCrAlY; Superalloys; Inter-diffusion; Minor elements
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:liu:diva-138496DOI: 10.1007/978-3-319-52333-0_23ISI: 000402563900023ISBN: 978-3-319-52333-0 (electronic)ISBN: 978-3-319-51647-9 (print)OAI: oai:DiVA.org:liu-138496DiVA, id: diva2:1111630
Conference
2nd Energy Materials Conference
Note
Funding Agencies|Swedish governmental agency for Innovation Systems (VINNOVA)
2017-06-192017-06-192017-06-19