Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting process
The simultaneous provision of strength and ductility of casting superalloy is challenging. In this work, a micro-grain casting process was applied to produce grain-refined K4169 alloy, which exhibited a superior combination of tensile ultimate strength, yield strength and elongation of 1204 MPa, 104...
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| Language: | English |
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Elsevier
2023-12-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127523008651 |
| _version_ | 1797391921903042560 |
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| author | Yue Wang Jinshan He Pinpin Hu Chengbo Xiao Xitao Wang |
| author_facet | Yue Wang Jinshan He Pinpin Hu Chengbo Xiao Xitao Wang |
| author_sort | Yue Wang |
| collection | DOAJ |
| description | The simultaneous provision of strength and ductility of casting superalloy is challenging. In this work, a micro-grain casting process was applied to produce grain-refined K4169 alloy, which exhibited a superior combination of tensile ultimate strength, yield strength and elongation of 1204 MPa, 1041 MPa and 21.0 % at 23 °C. The tensile strengths were significantly enhanced without elongation weakened compared with the conventional casting one, which exhibited values of 947 MPa, 813 MPa and 20.0 %, respectively. As temperature decreased to −196 °C, the elongation of micro-grain K4169 further increased to 26.1 % while decreased to 13.5 % of the conventional one resulting from the different twinning tendencies related to grain refinement. This is because twinning occurs predominantly in grains orientated close to the 〈111〉 // tensile axis, and micro-grain casting process improves the probability for grains to meet this crystallography condition. The deformation twins together with stacking faults and Lomer-Cottrell locks ensured continuous work hardening, resulting in the delayed onset of necking and a better elongation. This work highlights the excellent mechanical properties of micro-grain K4169 and anticipates its enormous application potential. Moreover, the results of micromechanical behavior-microstructure-property relationship may improve the understanding of the plastic deformation of K4169 alloy and guide a further upgrading. |
| first_indexed | 2024-03-08T23:39:42Z |
| format | Article |
| id | doaj.art-764b139c8d9243bb8b5c36122f0c3c75 |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-03-08T23:39:42Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
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| series | Materials & Design |
| spelling | doaj.art-764b139c8d9243bb8b5c36122f0c3c752023-12-14T05:20:17ZengElsevierMaterials & Design0264-12752023-12-01236112450Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting processYue Wang0Jinshan He1Pinpin Hu2Chengbo Xiao3Xitao Wang4Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaCollaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; Corresponding authors at: Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China (J. He); Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China (C. Xiao).Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, ChinaScience and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China; Corresponding authors at: Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China (J. He); Science and Technology on Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China (C. Xiao).Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China; Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, ChinaThe simultaneous provision of strength and ductility of casting superalloy is challenging. In this work, a micro-grain casting process was applied to produce grain-refined K4169 alloy, which exhibited a superior combination of tensile ultimate strength, yield strength and elongation of 1204 MPa, 1041 MPa and 21.0 % at 23 °C. The tensile strengths were significantly enhanced without elongation weakened compared with the conventional casting one, which exhibited values of 947 MPa, 813 MPa and 20.0 %, respectively. As temperature decreased to −196 °C, the elongation of micro-grain K4169 further increased to 26.1 % while decreased to 13.5 % of the conventional one resulting from the different twinning tendencies related to grain refinement. This is because twinning occurs predominantly in grains orientated close to the 〈111〉 // tensile axis, and micro-grain casting process improves the probability for grains to meet this crystallography condition. The deformation twins together with stacking faults and Lomer-Cottrell locks ensured continuous work hardening, resulting in the delayed onset of necking and a better elongation. This work highlights the excellent mechanical properties of micro-grain K4169 and anticipates its enormous application potential. Moreover, the results of micromechanical behavior-microstructure-property relationship may improve the understanding of the plastic deformation of K4169 alloy and guide a further upgrading.http://www.sciencedirect.com/science/article/pii/S0264127523008651Micro-grain castingK4169Tensile propertyStrengthening mechanismDeformation mechanismTwinning |
| spellingShingle | Yue Wang Jinshan He Pinpin Hu Chengbo Xiao Xitao Wang Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting process Materials & Design Micro-grain casting K4169 Tensile property Strengthening mechanism Deformation mechanism Twinning |
| title | Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting process |
| title_full | Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting process |
| title_fullStr | Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting process |
| title_full_unstemmed | Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting process |
| title_short | Exceptional cryogenic tensile properties of K4169 superalloy by micro-grain casting process |
| title_sort | exceptional cryogenic tensile properties of k4169 superalloy by micro grain casting process |
| topic | Micro-grain casting K4169 Tensile property Strengthening mechanism Deformation mechanism Twinning |
| url | http://www.sciencedirect.com/science/article/pii/S0264127523008651 |
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