The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting
In this work, two Ni-based superalloys with 13 wt.% and 35 wt.% Co were prepared via selective laser melting (SLM), and the effects of Co on the microstructure and mechanical properties of the additively manufactured superalloys were investigated. As the Co fraction increased from 13 wt.% to 35 wt.%...
| Main Authors: | , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-04-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/16/7/2926 |
| _version_ | 1797607483761491968 |
|---|---|
| author | Xiaoqiong Ouyang Feng Liu Lan Huang Lin Ye Heng Dong Liming Tan Li Wang Xiaochao Jin Yong Liu |
| author_facet | Xiaoqiong Ouyang Feng Liu Lan Huang Lin Ye Heng Dong Liming Tan Li Wang Xiaochao Jin Yong Liu |
| author_sort | Xiaoqiong Ouyang |
| collection | DOAJ |
| description | In this work, two Ni-based superalloys with 13 wt.% and 35 wt.% Co were prepared via selective laser melting (SLM), and the effects of Co on the microstructure and mechanical properties of the additively manufactured superalloys were investigated. As the Co fraction increased from 13 wt.% to 35 wt.%, the average grain size decreased from 25.69 μm to 17.57 μm, and the size of the nano-phases significantly increased from 80.54 nm to 230 nm. Moreover, the morphology of the γ′ phase changed from that of a cuboid to a sphere, since Co decreased the γ/γ′ lattice mismatch from 0.64% to 0.19%. At room temperature, the yield strength and ultimate tensile strength of the 13Co alloy reached 1379 MPa and 1487.34 MPa, and those of the 35Co alloy were reduced to 1231 MPa and 1350 MPa, while the elongation increased by 52%. The theoretical calculation indicated that the precipitation strengthening derived from the γ′ precipitates made the greatest contribution to the strength. |
| first_indexed | 2024-03-11T05:30:34Z |
| format | Article |
| id | doaj.art-4cda9ebe75a84389987a6d522d2e9554 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T05:30:34Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4cda9ebe75a84389987a6d522d2e95542023-11-17T17:07:11ZengMDPI AGMaterials1996-19442023-04-01167292610.3390/ma16072926The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser MeltingXiaoqiong Ouyang0Feng Liu1Lan Huang2Lin Ye3Heng Dong4Liming Tan5Li Wang6Xiaochao Jin7Yong Liu8State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, ChinaState Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, ChinaIn this work, two Ni-based superalloys with 13 wt.% and 35 wt.% Co were prepared via selective laser melting (SLM), and the effects of Co on the microstructure and mechanical properties of the additively manufactured superalloys were investigated. As the Co fraction increased from 13 wt.% to 35 wt.%, the average grain size decreased from 25.69 μm to 17.57 μm, and the size of the nano-phases significantly increased from 80.54 nm to 230 nm. Moreover, the morphology of the γ′ phase changed from that of a cuboid to a sphere, since Co decreased the γ/γ′ lattice mismatch from 0.64% to 0.19%. At room temperature, the yield strength and ultimate tensile strength of the 13Co alloy reached 1379 MPa and 1487.34 MPa, and those of the 35Co alloy were reduced to 1231 MPa and 1350 MPa, while the elongation increased by 52%. The theoretical calculation indicated that the precipitation strengthening derived from the γ′ precipitates made the greatest contribution to the strength.https://www.mdpi.com/1996-1944/16/7/2926Ni-base superalloyselective laser meltingcobaltstrengthductility |
| spellingShingle | Xiaoqiong Ouyang Feng Liu Lan Huang Lin Ye Heng Dong Liming Tan Li Wang Xiaochao Jin Yong Liu The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting Materials Ni-base superalloy selective laser melting cobalt strength ductility |
| title | The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting |
| title_full | The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting |
| title_fullStr | The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting |
| title_full_unstemmed | The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting |
| title_short | The Effects of Co on the Microstructure and Mechanical Properties of Ni-Based Superalloys Prepared via Selective Laser Melting |
| title_sort | effects of co on the microstructure and mechanical properties of ni based superalloys prepared via selective laser melting |
| topic | Ni-base superalloy selective laser melting cobalt strength ductility |
| url | https://www.mdpi.com/1996-1944/16/7/2926 |
| work_keys_str_mv | AT xiaoqiongouyang theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT fengliu theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT lanhuang theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT linye theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT hengdong theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT limingtan theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT liwang theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT xiaochaojin theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT yongliu theeffectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT xiaoqiongouyang effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT fengliu effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT lanhuang effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT linye effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT hengdong effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT limingtan effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT liwang effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT xiaochaojin effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting AT yongliu effectsofcoonthemicrostructureandmechanicalpropertiesofnibasedsuperalloyspreparedviaselectivelasermelting |