Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy
The additive manufacturing of directionally solidified Ni-based superalloys remains a significant challenge due to the formation of stray equiaxed grains and their high susceptibility to cracking, particularly for high-volume γ´-type Ni-based superalloys. In this study, a novel strategy based on tem...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424021069 |
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| author | Fangxian Zhang Liping Zhou Xinliang Xie Zhenbo Zhang Qi Chao Guohua Fan |
| author_facet | Fangxian Zhang Liping Zhou Xinliang Xie Zhenbo Zhang Qi Chao Guohua Fan |
| author_sort | Fangxian Zhang |
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| description | The additive manufacturing of directionally solidified Ni-based superalloys remains a significant challenge due to the formation of stray equiaxed grains and their high susceptibility to cracking, particularly for high-volume γ´-type Ni-based superalloys. In this study, a novel strategy based on temperature field management was proposed to prevent hot cracking and control crystallographic texture during laser powder bed fusion (LPBF) of IN738LC superalloy. The influence of laser parameters and substrate preheating on crack density, melt pool morphology, and texture of IN738LC superalloy was investigated. The fluid dynamics and thermal behavior of melt pool was simulated using the discrete element model (DEM) and volume of fluid (VOF) method. The processing window for achieving defect-free IN738LC samples was established and was found to be highly affected by substrate preheating. Substrate preheating at 350 °C resulted in expanded processing window, with the volume energy density ranging from 42.9 to 62.5 J/mm³ without substrate preheating to 40–75 J/mm³. The enlarged processing window was achieved by reducing cracking susceptibility due to the reduced temperature gradient and cooling rate. A unique crystallographic lamellar microstructure (CLM), comprising a <110>-oriented major layer and <100>-oriented sub-layer along the building direction, was successfully achieved in the LPBF-processed IN738LC superalloy. The solidification conditions for obtaining such a CLM were discussed on the aspects of temperature gradient and solidification rate within the melt pool. This work provides new insights and methods for preparing crack-free γ´-Ni-based superalloys with specific textures, which is favorable for improving the high-temperature properties. |
| format | Article |
| id | doaj-art-dfca67cc625f405a96803376f6e07dfd |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-dfca67cc625f405a96803376f6e07dfd2025-08-20T02:35:33ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013365266610.1016/j.jmrt.2024.09.101Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloyFangxian Zhang0Liping Zhou1Xinliang Xie2Zhenbo Zhang3Qi Chao4Guohua Fan5Key Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing, 211816, ChinaKey Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing, 211816, ChinaKey Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing, 211816, China; Corresponding author.Center for Adaptive System Engineering, ShanghaiTech University, Shanghai, 201210, ChinaKey Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing, 211816, China; Corresponding author.Key Laboratory for Light-Weight Materials, Nanjing Tech University, Nanjing, 211816, China; Corresponding author.The additive manufacturing of directionally solidified Ni-based superalloys remains a significant challenge due to the formation of stray equiaxed grains and their high susceptibility to cracking, particularly for high-volume γ´-type Ni-based superalloys. In this study, a novel strategy based on temperature field management was proposed to prevent hot cracking and control crystallographic texture during laser powder bed fusion (LPBF) of IN738LC superalloy. The influence of laser parameters and substrate preheating on crack density, melt pool morphology, and texture of IN738LC superalloy was investigated. The fluid dynamics and thermal behavior of melt pool was simulated using the discrete element model (DEM) and volume of fluid (VOF) method. The processing window for achieving defect-free IN738LC samples was established and was found to be highly affected by substrate preheating. Substrate preheating at 350 °C resulted in expanded processing window, with the volume energy density ranging from 42.9 to 62.5 J/mm³ without substrate preheating to 40–75 J/mm³. The enlarged processing window was achieved by reducing cracking susceptibility due to the reduced temperature gradient and cooling rate. A unique crystallographic lamellar microstructure (CLM), comprising a <110>-oriented major layer and <100>-oriented sub-layer along the building direction, was successfully achieved in the LPBF-processed IN738LC superalloy. The solidification conditions for obtaining such a CLM were discussed on the aspects of temperature gradient and solidification rate within the melt pool. This work provides new insights and methods for preparing crack-free γ´-Ni-based superalloys with specific textures, which is favorable for improving the high-temperature properties.http://www.sciencedirect.com/science/article/pii/S2238785424021069Laser powder bed fusionNi-based superalloySolidification crackCrystallographic textureSubstrate preheating |
| spellingShingle | Fangxian Zhang Liping Zhou Xinliang Xie Zhenbo Zhang Qi Chao Guohua Fan Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy Journal of Materials Research and Technology Laser powder bed fusion Ni-based superalloy Solidification crack Crystallographic texture Substrate preheating |
| title | Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy |
| title_full | Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy |
| title_fullStr | Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy |
| title_full_unstemmed | Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy |
| title_short | Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy |
| title_sort | crack inhibition and crystallographic texture control in an additively manufactured in738lc ni based superalloy |
| topic | Laser powder bed fusion Ni-based superalloy Solidification crack Crystallographic texture Substrate preheating |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424021069 |
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