Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting
Materials produced by additive manufacturing (AM) often have different microstructures from those obtained using conventional metallurgy (CM), which can have significant impacts on the materials’ durability, and in particular, resistance to corrosion. In this study, we were concerned with the suscep...
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MDPI AG
2022-10-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/20/7121 |
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| author | Nizar Guennouni Daniel Maisonnette Christophe Grosjean Dominique Poquillon Christine Blanc |
| author_facet | Nizar Guennouni Daniel Maisonnette Christophe Grosjean Dominique Poquillon Christine Blanc |
| author_sort | Nizar Guennouni |
| collection | DOAJ |
| description | Materials produced by additive manufacturing (AM) often have different microstructures from those obtained using conventional metallurgy (CM), which can have significant impacts on the materials’ durability, and in particular, resistance to corrosion. In this study, we were concerned with the susceptibility to pitting and environmentally assisted cracking (EAC) of 17-4PH martensitic stainless steel (MSS). We focused on the evolution from pitting to EAC, and the behaviour of MSS produced by AM was compared with that of its CM counterpart. Potentiodynamic polarisation tests were combined with chronoamperometry measurements performed without and with mechanical loading to study both stable and metastable pitting and the influence of stress on these processes. EAC tests were carried out and combined with observations of fracture surfaces. MSS produced by AM was more resistant to pit initiation due to fewer and finer NbC particles. However, the propagation kinetics of stable pits were higher for this MSS due to a higher amount of reversed austenite. The stress was found to stabilise the metastable pits and to accelerate the propagation of stable pits, which resulted in an increased susceptibility to EAC of the MSS produced by AM. These results clearly highlighted the fact that the reversed austenite amount has to be perfectly controlled in AM processes. |
| first_indexed | 2024-03-09T19:54:29Z |
| format | Article |
| id | doaj.art-c698c4152ffd4f2a9c1e41eeb6297a87 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T19:54:29Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-c698c4152ffd4f2a9c1e41eeb6297a872023-11-24T01:02:32ZengMDPI AGMaterials1996-19442022-10-011520712110.3390/ma15207121Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam MeltingNizar Guennouni0Daniel Maisonnette1Christophe Grosjean2Dominique Poquillon3Christine Blanc4CIRIMAT, Université de Toulouse, CNRS, INP-ENSIACET 4 allée Emile Monso, CS 44362, CEDEX 4, 31030 Toulouse, FrancePôle MMS, CETIM, 7 rue de la Presse, 42000 Saint-Etienne, FrancePôle MMS, CETIM, 7 rue de la Presse, 42000 Saint-Etienne, FranceCIRIMAT, Université de Toulouse, CNRS, INP-ENSIACET 4 allée Emile Monso, CS 44362, CEDEX 4, 31030 Toulouse, FranceCIRIMAT, Université de Toulouse, CNRS, INP-ENSIACET 4 allée Emile Monso, CS 44362, CEDEX 4, 31030 Toulouse, FranceMaterials produced by additive manufacturing (AM) often have different microstructures from those obtained using conventional metallurgy (CM), which can have significant impacts on the materials’ durability, and in particular, resistance to corrosion. In this study, we were concerned with the susceptibility to pitting and environmentally assisted cracking (EAC) of 17-4PH martensitic stainless steel (MSS). We focused on the evolution from pitting to EAC, and the behaviour of MSS produced by AM was compared with that of its CM counterpart. Potentiodynamic polarisation tests were combined with chronoamperometry measurements performed without and with mechanical loading to study both stable and metastable pitting and the influence of stress on these processes. EAC tests were carried out and combined with observations of fracture surfaces. MSS produced by AM was more resistant to pit initiation due to fewer and finer NbC particles. However, the propagation kinetics of stable pits were higher for this MSS due to a higher amount of reversed austenite. The stress was found to stabilise the metastable pits and to accelerate the propagation of stable pits, which resulted in an increased susceptibility to EAC of the MSS produced by AM. These results clearly highlighted the fact that the reversed austenite amount has to be perfectly controlled in AM processes.https://www.mdpi.com/1996-1944/15/20/7121martensitic stainless steelausteniteenvironmentally assisted crackingpittingpit initiationpit propagation |
| spellingShingle | Nizar Guennouni Daniel Maisonnette Christophe Grosjean Dominique Poquillon Christine Blanc Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting Materials martensitic stainless steel austenite environmentally assisted cracking pitting pit initiation pit propagation |
| title | Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting |
| title_full | Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting |
| title_fullStr | Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting |
| title_full_unstemmed | Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting |
| title_short | Susceptibility to Pitting and Environmentally Assisted Cracking of 17-4PH Martensitic Stainless Steel Produced by Laser Beam Melting |
| title_sort | susceptibility to pitting and environmentally assisted cracking of 17 4ph martensitic stainless steel produced by laser beam melting |
| topic | martensitic stainless steel austenite environmentally assisted cracking pitting pit initiation pit propagation |
| url | https://www.mdpi.com/1996-1944/15/20/7121 |
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