Recrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusion
The CoCrMo alloys fabricated by the laser powder bed fusion (LPBF) exhibit significant anisotropy due to the characteristics of layer-by-layer manufacturing. This study investigated the microstructural evolution and mechanical properties of CoCrMo alloys in both as-printed and heat-treated states. T...
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IOP Publishing
2025-01-01
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| Series: | Materials Futures |
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| Online Access: | https://doi.org/10.1088/2752-5724/adb50a |
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| author | Lijin Dai Changhui Song Houxiong Fu Hongyi Chen Zhongwei Yan Zibin Liu Renyao Li Anming Wang Yongqiang Yang Jia-Kuo Yu |
| author_facet | Lijin Dai Changhui Song Houxiong Fu Hongyi Chen Zhongwei Yan Zibin Liu Renyao Li Anming Wang Yongqiang Yang Jia-Kuo Yu |
| author_sort | Lijin Dai |
| collection | DOAJ |
| description | The CoCrMo alloys fabricated by the laser powder bed fusion (LPBF) exhibit significant anisotropy due to the characteristics of layer-by-layer manufacturing. This study investigated the microstructural evolution and mechanical properties of CoCrMo alloys in both as-printed and heat-treated states. The results demonstrated that the elongation was 19.1% in the tensile direction parallel to the building direction, compared to only 9.3% in the perpendicular direction, showing a difference of over 100%. After solution heat treatment at 1150 °C for 1 h followed by annealing heat treatment at 450 °C for 0.5 h, the ultimate tensile strength (UTS) and elongation nearly equalized, reaching 906.1 MPa, 20.2% and 879.2 MPa, 17.9%, respectively. Further characterization indicated that the anisotropy was mainly caused by grain morphology. Solution treatment-induced recrystallization refined coarse columnar grains into equiaxed grains that accommodated orientation-related stresses, which tentatively achieves microstructural and mechanical homogeneity. Subsequent low-temperature annealing broke the trade-off between the strength and ductility while further promoting the isotropy. At this stage, the mechanical properties were strengthened by the synergistic interaction of nanoscale annealing twins and martensitic laths. This study provided valuable insights for optimizing the isotropic behavior in LPBF-fabricated CoCrMo alloys. |
| format | Article |
| id | doaj-art-d8663dd3bf7b44faba2d1ee4eb589a06 |
| institution | DOAJ |
| issn | 2752-5724 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Futures |
| spelling | doaj-art-d8663dd3bf7b44faba2d1ee4eb589a062025-08-20T03:00:07ZengIOP PublishingMaterials Futures2752-57242025-01-014202500110.1088/2752-5724/adb50aRecrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusionLijin Dai0Changhui Song1https://orcid.org/0000-0001-6225-7627Houxiong Fu2Hongyi Chen3Zhongwei Yan4Zibin Liu5Renyao Li6Anming Wang7Yongqiang Yang8Jia-Kuo Yu9School of Mechanical and Automotive Engineering, South China University of Technology , Guangzhou 510640, People’s Republic of ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology , Guangzhou 510640, People’s Republic of ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology , Guangzhou 510640, People’s Republic of ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology , Guangzhou 510640, People’s Republic of ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology , Guangzhou 510640, People’s Republic of ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology , Guangzhou 510640, People’s Republic of ChinaNaton Biotechnology (Beijing) Co. , Ltd, Beijing 100094, People’s Republic of China; School of Biological Science and Medical Engineering, Beihang University , Beijing 100083, People’s Republic of ChinaNaton Biotechnology (Beijing) Co. , Ltd, Beijing 100094, People’s Republic of ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology , Guangzhou 510640, People’s Republic of ChinaOrthopaedic and Sports Medicine Center, Beijing Tsinghua Changgung Hospital, Tsinghua University , Beijing 102218, People’s Republic of ChinaThe CoCrMo alloys fabricated by the laser powder bed fusion (LPBF) exhibit significant anisotropy due to the characteristics of layer-by-layer manufacturing. This study investigated the microstructural evolution and mechanical properties of CoCrMo alloys in both as-printed and heat-treated states. The results demonstrated that the elongation was 19.1% in the tensile direction parallel to the building direction, compared to only 9.3% in the perpendicular direction, showing a difference of over 100%. After solution heat treatment at 1150 °C for 1 h followed by annealing heat treatment at 450 °C for 0.5 h, the ultimate tensile strength (UTS) and elongation nearly equalized, reaching 906.1 MPa, 20.2% and 879.2 MPa, 17.9%, respectively. Further characterization indicated that the anisotropy was mainly caused by grain morphology. Solution treatment-induced recrystallization refined coarse columnar grains into equiaxed grains that accommodated orientation-related stresses, which tentatively achieves microstructural and mechanical homogeneity. Subsequent low-temperature annealing broke the trade-off between the strength and ductility while further promoting the isotropy. At this stage, the mechanical properties were strengthened by the synergistic interaction of nanoscale annealing twins and martensitic laths. This study provided valuable insights for optimizing the isotropic behavior in LPBF-fabricated CoCrMo alloys.https://doi.org/10.1088/2752-5724/adb50alaser powder bed fusionCoCrMo alloyheat treatmentanisotropymechanical properties |
| spellingShingle | Lijin Dai Changhui Song Houxiong Fu Hongyi Chen Zhongwei Yan Zibin Liu Renyao Li Anming Wang Yongqiang Yang Jia-Kuo Yu Recrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusion Materials Futures laser powder bed fusion CoCrMo alloy heat treatment anisotropy mechanical properties |
| title | Recrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusion |
| title_full | Recrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusion |
| title_fullStr | Recrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusion |
| title_full_unstemmed | Recrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusion |
| title_short | Recrystallization induced by heat treatment regulates the anisotropic behavior of CoCrMo alloys fabricated by laser powder bed fusion |
| title_sort | recrystallization induced by heat treatment regulates the anisotropic behavior of cocrmo alloys fabricated by laser powder bed fusion |
| topic | laser powder bed fusion CoCrMo alloy heat treatment anisotropy mechanical properties |
| url | https://doi.org/10.1088/2752-5724/adb50a |
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