TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy
Inconel 718 is widely used because of its ability to retain strength at up to 650∘C for long periods of time through coherent metastable 𝛾 Ni3Nb precipitation associated with a smaller volume fraction of 𝛾 Ni3Al precipitates. At very long ageing times at service temperature, 𝛾 decomposes to...
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| Format: | Article |
| Language: | English |
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Wiley
2011-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2011/940634 |
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| author | Moukrane Dehmas Jacques Lacaze Aliou Niang Bernard Viguier |
| author_facet | Moukrane Dehmas Jacques Lacaze Aliou Niang Bernard Viguier |
| author_sort | Moukrane Dehmas |
| collection | DOAJ |
| description | Inconel 718 is widely used because of its ability to retain strength at up to 650∘C for long periods of time through coherent metastable 𝛾
Ni3Nb precipitation associated with a smaller volume fraction of 𝛾
Ni3Al precipitates. At very long ageing times at service temperature, 𝛾
decomposes to the stable Ni3Nb 𝛿 phase. This latter phase is also present above the 𝛾
solvus and is used for grain control during forging of alloy 718. While most works available on 𝛿 precipitation have been performed at temperatures below the 𝛾
solvus, it appeared of interest to also investigate the case where 𝛿 phase precipitates directly from the fcc matrix free of 𝛾
precipitates. This was studied by X-ray diffraction and transmission electron microscopy (TEM). TEM observations confirmed the presence of rotation-ordered domains in 𝛿 plates, and some unexpected contrast could be explained by double diffraction due to overlapping phases. |
| format | Article |
| id | doaj-art-915af91eacc6402a9f412f8ef5ad7818 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-915af91eacc6402a9f412f8ef5ad78182025-02-03T01:03:32ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422011-01-01201110.1155/2011/940634940634TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 AlloyMoukrane Dehmas0Jacques Lacaze1Aliou Niang2Bernard Viguier3IJL-SI2M UMR 7198 CNRS-Nancy Université-UPV Metz, École des Mines de Nancy, Parc de Saurupt, CS 14234, 54042 Nancy Cedex, FranceInstitut Carnot CIRIMAT, Université de Toulouse, INP-ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse Cedex 4, FranceInstitut Carnot CIRIMAT, Université de Toulouse, INP-ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse Cedex 4, FranceInstitut Carnot CIRIMAT, Université de Toulouse, INP-ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse Cedex 4, FranceInconel 718 is widely used because of its ability to retain strength at up to 650∘C for long periods of time through coherent metastable 𝛾 Ni3Nb precipitation associated with a smaller volume fraction of 𝛾 Ni3Al precipitates. At very long ageing times at service temperature, 𝛾 decomposes to the stable Ni3Nb 𝛿 phase. This latter phase is also present above the 𝛾 solvus and is used for grain control during forging of alloy 718. While most works available on 𝛿 precipitation have been performed at temperatures below the 𝛾 solvus, it appeared of interest to also investigate the case where 𝛿 phase precipitates directly from the fcc matrix free of 𝛾 precipitates. This was studied by X-ray diffraction and transmission electron microscopy (TEM). TEM observations confirmed the presence of rotation-ordered domains in 𝛿 plates, and some unexpected contrast could be explained by double diffraction due to overlapping phases.http://dx.doi.org/10.1155/2011/940634 |
| spellingShingle | Moukrane Dehmas Jacques Lacaze Aliou Niang Bernard Viguier TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy Advances in Materials Science and Engineering |
| title | TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy |
| title_full | TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy |
| title_fullStr | TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy |
| title_full_unstemmed | TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy |
| title_short | TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy |
| title_sort | tem study of high temperature precipitation of delta phase in inconel 718 alloy |
| url | http://dx.doi.org/10.1155/2011/940634 |
| work_keys_str_mv | AT moukranedehmas temstudyofhightemperatureprecipitationofdeltaphaseininconel718alloy AT jacqueslacaze temstudyofhightemperatureprecipitationofdeltaphaseininconel718alloy AT aliouniang temstudyofhightemperatureprecipitationofdeltaphaseininconel718alloy AT bernardviguier temstudyofhightemperatureprecipitationofdeltaphaseininconel718alloy |