Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS)
This research investigates the microstructure and defects of powder metallurgy (PM) nickel-based superalloys prepared by spark plasma sintering (SPS). The densification, microstructural evolution, and precipitate phase evolution processes of FGH96 superalloy after powder heat treatment (PHT) and sin...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-06-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/16/13/4664 |
| _version_ | 1797591381014740992 |
|---|---|
| author | Zijun Qin Qianyi Li Guowei Wang Feng Liu |
| author_facet | Zijun Qin Qianyi Li Guowei Wang Feng Liu |
| author_sort | Zijun Qin |
| collection | DOAJ |
| description | This research investigates the microstructure and defects of powder metallurgy (PM) nickel-based superalloys prepared by spark plasma sintering (SPS). The densification, microstructural evolution, and precipitate phase evolution processes of FGH96 superalloy after powder heat treatment (PHT) and sintering via SPS are specifically analyzed. Experimental results demonstrate that SPS technology, when applied to sinter at the sub-solidus temperature of the γ’ phase, effectively mitigates the formation of a prior particle boundary (PPB). Based on experimental and computational findings, it has been determined that the presence of elemental segregation and Al<sub>2</sub>O<sub>3</sub> oxides on the surface of pre-alloyed powders leads to the preferential precipitation of MC-type carbides and Al<sub>2</sub>O<sub>3</sub> and ZrO<sub>2</sub> oxides in the sintering necks during the hot consolidation process, resulting in the formation of PPB. This study contributes to the understanding of microstructural modifications achieved through SPS technology, providing crucial information for optimizing sintering conditions and reducing the widespread occurrence of PPB, ultimately enhancing the material performance of PM nickel-based superalloys. |
| first_indexed | 2024-03-11T01:36:35Z |
| format | Article |
| id | doaj.art-df624478802a493bbbbd4ecc02101ac9 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T01:36:35Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-df624478802a493bbbbd4ecc02101ac92023-11-18T16:58:01ZengMDPI AGMaterials1996-19442023-06-011613466410.3390/ma16134664Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS)Zijun Qin0Qianyi Li1Guowei Wang2Feng Liu3The State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaThe State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaThe State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaThe State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaThis research investigates the microstructure and defects of powder metallurgy (PM) nickel-based superalloys prepared by spark plasma sintering (SPS). The densification, microstructural evolution, and precipitate phase evolution processes of FGH96 superalloy after powder heat treatment (PHT) and sintering via SPS are specifically analyzed. Experimental results demonstrate that SPS technology, when applied to sinter at the sub-solidus temperature of the γ’ phase, effectively mitigates the formation of a prior particle boundary (PPB). Based on experimental and computational findings, it has been determined that the presence of elemental segregation and Al<sub>2</sub>O<sub>3</sub> oxides on the surface of pre-alloyed powders leads to the preferential precipitation of MC-type carbides and Al<sub>2</sub>O<sub>3</sub> and ZrO<sub>2</sub> oxides in the sintering necks during the hot consolidation process, resulting in the formation of PPB. This study contributes to the understanding of microstructural modifications achieved through SPS technology, providing crucial information for optimizing sintering conditions and reducing the widespread occurrence of PPB, ultimately enhancing the material performance of PM nickel-based superalloys.https://www.mdpi.com/1996-1944/16/13/4664superalloypowder metallurgyspark plasma sintering (SPS)prior particle boundary (PPB) |
| spellingShingle | Zijun Qin Qianyi Li Guowei Wang Feng Liu Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS) Materials superalloy powder metallurgy spark plasma sintering (SPS) prior particle boundary (PPB) |
| title | Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS) |
| title_full | Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS) |
| title_fullStr | Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS) |
| title_full_unstemmed | Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS) |
| title_short | Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS) |
| title_sort | microstructural characterization and prior particle boundary ppb of pm nickel based superalloys by spark plasma sintering sps |
| topic | superalloy powder metallurgy spark plasma sintering (SPS) prior particle boundary (PPB) |
| url | https://www.mdpi.com/1996-1944/16/13/4664 |
| work_keys_str_mv | AT zijunqin microstructuralcharacterizationandpriorparticleboundaryppbofpmnickelbasedsuperalloysbysparkplasmasinteringsps AT qianyili microstructuralcharacterizationandpriorparticleboundaryppbofpmnickelbasedsuperalloysbysparkplasmasinteringsps AT guoweiwang microstructuralcharacterizationandpriorparticleboundaryppbofpmnickelbasedsuperalloysbysparkplasmasinteringsps AT fengliu microstructuralcharacterizationandpriorparticleboundaryppbofpmnickelbasedsuperalloysbysparkplasmasinteringsps |