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Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade

The study investigates the microstructural transformation and mechanical properties of nickel-based IN738 super-alloy turbine blade after service exposure of 52,000 h at temperature of ±720°C for the degradations and stress rupture profile. The grain boundary carbides, decomposition and the transfor...

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Main Authors: Owolabi, A.L., Megat-Yusoff, P.S.M., Said, M.A.M.
Format: Article
Published: Inderscience Enterprises Ltd. 2017
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032664672&doi=10.1504%2fIJMMP.2017.087661&partnerID=40&md5=661b83f31bffcc4d9747e5b2c5fddbf0
http://eprints.utp.edu.my/19735/
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spelling my.utp.eprints.197352018-04-20T07:35:16Z Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade Owolabi, A.L. Megat-Yusoff, P.S.M. Said, M.A.M. The study investigates the microstructural transformation and mechanical properties of nickel-based IN738 super-alloy turbine blade after service exposure of 52,000 h at temperature of ±720°C for the degradations and stress rupture profile. The grain boundary carbides, decomposition and the transformation of MC carbides (gamma prime (γ) and creep cavities are analysed. The growth of γ precipitates in the microstructure was investigated using transmission electron microscopy. It was observed that gamma prime (γ) possesses high coarsening at inter-dendritic area than in the dendrite core. Thus implies a contributing factor in the interface between the carbides, grain boundaries and the gamma prime (γ) films preferential location for nucleation and propagation of cracks and creep cavities. The coarsening behaviour of γ precipitates adhere with the Ostwald ripening. The average hardness values of the inside and outside portion of the turbine blade was 325 and 298 HV10, respectively. © 2017 Inderscience Enterprises Ltd. Inderscience Enterprises Ltd. 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032664672&doi=10.1504%2fIJMMP.2017.087661&partnerID=40&md5=661b83f31bffcc4d9747e5b2c5fddbf0 Owolabi, A.L. and Megat-Yusoff, P.S.M. and Said, M.A.M. (2017) Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade. International Journal of Microstructure and Materials Properties, 12 (1-2). pp. 38-54. http://eprints.utp.edu.my/19735/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description The study investigates the microstructural transformation and mechanical properties of nickel-based IN738 super-alloy turbine blade after service exposure of 52,000 h at temperature of ±720°C for the degradations and stress rupture profile. The grain boundary carbides, decomposition and the transformation of MC carbides (gamma prime (γ) and creep cavities are analysed. The growth of γ precipitates in the microstructure was investigated using transmission electron microscopy. It was observed that gamma prime (γ) possesses high coarsening at inter-dendritic area than in the dendrite core. Thus implies a contributing factor in the interface between the carbides, grain boundaries and the gamma prime (γ) films preferential location for nucleation and propagation of cracks and creep cavities. The coarsening behaviour of γ precipitates adhere with the Ostwald ripening. The average hardness values of the inside and outside portion of the turbine blade was 325 and 298 HV10, respectively. © 2017 Inderscience Enterprises Ltd.
format Article
author Owolabi, A.L.
Megat-Yusoff, P.S.M.
Said, M.A.M.
spellingShingle Owolabi, A.L.
Megat-Yusoff, P.S.M.
Said, M.A.M.
Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade
author_facet Owolabi, A.L.
Megat-Yusoff, P.S.M.
Said, M.A.M.
author_sort Owolabi, A.L.
title Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade
title_short Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade
title_full Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade
title_fullStr Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade
title_full_unstemmed Investigation on microstructure and mechanical properties on varying surface region of a serviceexposed IN738 turbine blade
title_sort investigation on microstructure and mechanical properties on varying surface region of a serviceexposed in738 turbine blade
publisher Inderscience Enterprises Ltd.
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85032664672&doi=10.1504%2fIJMMP.2017.087661&partnerID=40&md5=661b83f31bffcc4d9747e5b2c5fddbf0
http://eprints.utp.edu.my/19735/
_version_ 1738656112037593088
score 13.211869

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