The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusion
The current work explores the meso-scale deformation behaviour of an additively manufactured CM247 LC at room and high temperatures. In particular, the study focuses on assessing grain boundary sliding (GBS), which can play a crucial role in the high-temperature deformation of superalloys. Specific...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423031952 |
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| author | P.A. Martelli I. Sabirov M.A. Monclus E. Bassini G. Marchese D. Ugues |
| author_facet | P.A. Martelli I. Sabirov M.A. Monclus E. Bassini G. Marchese D. Ugues |
| author_sort | P.A. Martelli |
| collection | DOAJ |
| description | The current work explores the meso-scale deformation behaviour of an additively manufactured CM247 LC at room and high temperatures. In particular, the study focuses on assessing grain boundary sliding (GBS), which can play a crucial role in the high-temperature deformation of superalloys. Specific samples were produced using the Laser Based Powder Bed Fusion technique (PBF-LB), heat treated and tested under monotonic compression in a Gleeble® system. Compression tests were carried out in a wide temperature range at two strain rates and the effect of testing parameters on GBS activity was studied. A thorough microstructural characterization of the PBF-LB material using EBSD and TEM revealed a γ/γ’ microstructure consisting of columnar grains decorated with Hf-rich MC carbides without any segregations of alloying elements. Qualitative and quantitative analysis of GBS was performed using FEG-SEM and AFM, and contribution of GBS into plastic deformation was estimated. It was demonstrated that GBS is activated at 760 °C. A direct correlation between the contribution of GBS into plastic deformation and testing temperature was found, while strain rate has the opposite effect. The highest GBS contribution (∼32%) was recorded at 1093 °C/10−3 s−1. Finally, intergranular microcracking at triple junctions and along grain boundaries was observed when the material was tested at the highest temperatures (871 °C and 1093 °C). The effect of the temperature and the strain rate on the GBS activity in the PBF-LB material is discussed. |
| first_indexed | 2024-03-08T09:28:40Z |
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| id | doaj.art-323d2a1f97f1431c941a97d852e56fbb |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-08T09:28:40Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-323d2a1f97f1431c941a97d852e56fbb2024-01-31T05:43:42ZengElsevierJournal of Materials Research and Technology2238-78542024-01-012824662477The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusionP.A. Martelli0I. Sabirov1M.A. Monclus2E. Bassini3G. Marchese4D. Ugues5Politecnico di Torino, Dip. Scienza Applicata e Tecnologia (DISAT), Italy; Centro Interdipartimentale Integrated Additive Manufacturing IAM@PoliTO, ItalyIMDEA Materials Institute, Getafe, 28906, Madrid, SpainIMDEA Materials Institute, Getafe, 28906, Madrid, SpainPolitecnico di Torino, Dip. Scienza Applicata e Tecnologia (DISAT), Italy; Centro Interdipartimentale Integrated Additive Manufacturing IAM@PoliTO, Italy; Consorzio Nazionale della Scienza e Tecnologia dei Materiali (INSTM), Italy; Corresponding author. Politecnico di Torino, Dip. Scienza Applicata e Tecnologia (DISAT), Corso Duca Degli Abruzzi 24, 10129, Torino, Italy.Politecnico di Torino, Dip. Scienza Applicata e Tecnologia (DISAT), Italy; Centro Interdipartimentale Integrated Additive Manufacturing IAM@PoliTO, ItalyPolitecnico di Torino, Dip. Scienza Applicata e Tecnologia (DISAT), Italy; Centro Interdipartimentale Integrated Additive Manufacturing IAM@PoliTO, Italy; Consorzio Nazionale della Scienza e Tecnologia dei Materiali (INSTM), ItalyThe current work explores the meso-scale deformation behaviour of an additively manufactured CM247 LC at room and high temperatures. In particular, the study focuses on assessing grain boundary sliding (GBS), which can play a crucial role in the high-temperature deformation of superalloys. Specific samples were produced using the Laser Based Powder Bed Fusion technique (PBF-LB), heat treated and tested under monotonic compression in a Gleeble® system. Compression tests were carried out in a wide temperature range at two strain rates and the effect of testing parameters on GBS activity was studied. A thorough microstructural characterization of the PBF-LB material using EBSD and TEM revealed a γ/γ’ microstructure consisting of columnar grains decorated with Hf-rich MC carbides without any segregations of alloying elements. Qualitative and quantitative analysis of GBS was performed using FEG-SEM and AFM, and contribution of GBS into plastic deformation was estimated. It was demonstrated that GBS is activated at 760 °C. A direct correlation between the contribution of GBS into plastic deformation and testing temperature was found, while strain rate has the opposite effect. The highest GBS contribution (∼32%) was recorded at 1093 °C/10−3 s−1. Finally, intergranular microcracking at triple junctions and along grain boundaries was observed when the material was tested at the highest temperatures (871 °C and 1093 °C). The effect of the temperature and the strain rate on the GBS activity in the PBF-LB material is discussed.http://www.sciencedirect.com/science/article/pii/S2238785423031952Nickel-based superalloysPowder metallurgyHeat treatmentGrain boundary slidingGrain boundaryPlastic deformation mechanisms |
| spellingShingle | P.A. Martelli I. Sabirov M.A. Monclus E. Bassini G. Marchese D. Ugues The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusion Journal of Materials Research and Technology Nickel-based superalloys Powder metallurgy Heat treatment Grain boundary sliding Grain boundary Plastic deformation mechanisms |
| title | The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusion |
| title_full | The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusion |
| title_fullStr | The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusion |
| title_full_unstemmed | The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusion |
| title_short | The effect of temperature and strain rate on the grain boundary sliding in a CM247 LC Ni-based superalloy processed with laser based powder bed fusion |
| title_sort | effect of temperature and strain rate on the grain boundary sliding in a cm247 lc ni based superalloy processed with laser based powder bed fusion |
| topic | Nickel-based superalloys Powder metallurgy Heat treatment Grain boundary sliding Grain boundary Plastic deformation mechanisms |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423031952 |
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