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Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD

In situ X-ray diffraction and transmission electron microscopy has been used to investigate René 108 Ni-based superalloy after short-term annealing at high-homologous temperatures. Current work is focused on characterisation of γ′ precipitates, their volume fraction, evolution of the lattice paramet...

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Autores principales: Rakoczy, Łukasz, Milkovič, Ondrej, Rutkowski, Bogdan, Cygan, Rafał, Grudzień-Rakoczy, Małgorzata, Kromka, František, Zielińska-Lipiec, Anna
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7288281/
https://www.ncbi.nlm.nih.gov/pubmed/32455991
http://dx.doi.org/10.3390/ma13102397
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author Rakoczy, Łukasz
Milkovič, Ondrej
Rutkowski, Bogdan
Cygan, Rafał
Grudzień-Rakoczy, Małgorzata
Kromka, František
Zielińska-Lipiec, Anna
author_facet Rakoczy, Łukasz
Milkovič, Ondrej
Rutkowski, Bogdan
Cygan, Rafał
Grudzień-Rakoczy, Małgorzata
Kromka, František
Zielińska-Lipiec, Anna
author_sort Rakoczy, Łukasz
collection PubMed
description In situ X-ray diffraction and transmission electron microscopy has been used to investigate René 108 Ni-based superalloy after short-term annealing at high-homologous temperatures. Current work is focused on characterisation of γ′ precipitates, their volume fraction, evolution of the lattice parameter of γ and γ′ phases and misfit parameter of γ′ in the matrix. Material in the initial condition is characterised by a high-volume fraction (over 63%) of γ′ precipitates. Irregular distribution of alloying elements was observed. Matrix channels were strongly enriched in Cr, Co, W and Mo, whereas precipitates contain large amount of Al, Ti, Ta and Hf. Exposure to high-homologous temperatures in the range 1100–1250 °C led to the dissolution of the precipitates, which influenced the change of lattice parameter of both γ and γ′ phases. The lattice parameter of the matrix continuously grew during holding at high temperatures, which had a dominant influence on the more negative misfit coefficient.
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spelling pubmed-72882812020-06-17 Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD Rakoczy, Łukasz Milkovič, Ondrej Rutkowski, Bogdan Cygan, Rafał Grudzień-Rakoczy, Małgorzata Kromka, František Zielińska-Lipiec, Anna Materials (Basel) Article In situ X-ray diffraction and transmission electron microscopy has been used to investigate René 108 Ni-based superalloy after short-term annealing at high-homologous temperatures. Current work is focused on characterisation of γ′ precipitates, their volume fraction, evolution of the lattice parameter of γ and γ′ phases and misfit parameter of γ′ in the matrix. Material in the initial condition is characterised by a high-volume fraction (over 63%) of γ′ precipitates. Irregular distribution of alloying elements was observed. Matrix channels were strongly enriched in Cr, Co, W and Mo, whereas precipitates contain large amount of Al, Ti, Ta and Hf. Exposure to high-homologous temperatures in the range 1100–1250 °C led to the dissolution of the precipitates, which influenced the change of lattice parameter of both γ and γ′ phases. The lattice parameter of the matrix continuously grew during holding at high temperatures, which had a dominant influence on the more negative misfit coefficient. MDPI 2020-05-22 /pmc/articles/PMC7288281/ /pubmed/32455991 http://dx.doi.org/10.3390/ma13102397 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Rakoczy, Łukasz
Milkovič, Ondrej
Rutkowski, Bogdan
Cygan, Rafał
Grudzień-Rakoczy, Małgorzata
Kromka, František
Zielińska-Lipiec, Anna
Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD
title Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD
title_full Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD
title_fullStr Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD
title_full_unstemmed Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD
title_short Characterization of γ′ Precipitates in Cast Ni-Based Superalloy and Their Behaviour at High-Homologous Temperatures Studied by TEM and in Situ XRD
title_sort characterization of γ′ precipitates in cast ni-based superalloy and their behaviour at high-homologous temperatures studied by tem and in situ xrd
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7288281/
https://www.ncbi.nlm.nih.gov/pubmed/32455991
http://dx.doi.org/10.3390/ma13102397
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