Achieving superior strength and ductility in oxide dispersion strengthened IN625 alloy produced by laser powder bed fusion

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dc.authorid0009-0008-7150-7497
dc.authorid0000-0001-7370-3848
dc.authorid0009-0005-1512-8052
dc.authorid0009-0009-1340-8949
dc.authorid0000-0002-4923-7549
dc.contributor.authorDemirci, Kadir Tuğrul
dc.contributor.authorÖzalp, Ali
dc.contributor.authorGüner Gürbüz, Selen Nimet
dc.contributor.authorBükülmez, İlhan
dc.contributor.authorAksu, Erhan
dc.contributor.authorAydoğan, Eda
dc.date.accessioned2025-01-15T10:15:55Z
dc.date.available2025-01-15T10:15:55Z
dc.date.issued2024-12-19
dc.departmentTENMAK-Nükleer Enerji Araştırma Enstitüsü-Ankara
dc.description.abstractIn this study, a new grade of oxide dispersion strengthened (ODS) Inconel 625 (IN625) alloy having the composition of 0.3 wt% Y2O3 – 0.4 wt% Hf – IN625 has been developed and produced by laser powder bed fusion (L-PBF). Production parameters have been determined for standard and ODS IN625 alloys to yield >99.9% densification. Microstructural analyses reveal similar texture along <001> while a larger but homogenous strain distribution exist in ODS IN625. Nano-particles are determined to be mostly Y-Hf-O and Y2O3 with an average size of ~30 ± 18 nm and 2.2 ± 1.1x1013 m-2 areal fraction. Tensile tests at room temperature (RT) and 700 °C demonstrate superior mechanical properties of ODS-IN625, particularly at elevated temperatures. While the yield strengths of standard and ODS IN625 alloys are similar (~680 MPa), ductility of ODS IN625 is slightly larger at RT. However, the yield strength of ODS-IN625 increased by 7.4%, reaching ~580 MPa, compared to the standard IN625, which has a yield strength of ~540 MPa at 700 °C. More notably, the ductility of ODS IN625 shows a remarkable improvement, increasing from ~12% in the standard IN625 to ~22%, representing an increase of more than 80%. Detailed microstructural analyses on the fracture surfaces of the ODS IN625 alloys exhibit submicron dimples, as well as an extensive amount of dislocation loops, Lomer-Cortrel (L-C) locks, and stacking fault tetrahedra. Nano-oxides were determined to be responsible for the dislocation wall structure and dislocation distribution which in turn improves the mechanical properties. This study sheds light on tailoring the strength-ductility balance in IN625 alloys by introducing the nano-oxide particles and perceiving the mechanism of this improvement.
dc.identifier.doi10.1016
dc.identifier.urihttps://kurumsalarsiv.tenmak.gov.tr/handle/20.500.12878/2060
dc.institutionauthorDemirci, Kadir Tuğrul
dc.institutionauthorGüner Gürbüz, Selen Nimet
dc.institutionauthorBükülmez, İlhan
dc.institutionauthorAksu, Erhan
dc.language.isoen
dc.publisherELSEVIER
dc.relation.journalMaterials Science & Engineering A
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectInconel 625
dc.subjectAdditive manufacturing
dc.subjectOxide dispersion strengthening
dc.subjectMechanical properties
dc.subjectTransmission electron microscopy
dc.titleAchieving superior strength and ductility in oxide dispersion strengthened IN625 alloy produced by laser powder bed fusion
dc.typearticle
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