Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting
Selective laser melting (SLM) is a powder-bed fusion additive manufacturing process that fabricates metallic parts in a layer-by-layer manner. IN718 is a nickel-based austenitic (γ) superalloy with broad applications in aerospace, chemical, and nuclear industries. In this study, fully-dense IN718-ma...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2019
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| Online Access: | https://hdl.handle.net/10356/105815 http://hdl.handle.net/10220/48751 |
| _version_ | 1826111491605004288 |
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| author | Yao, Xiling Moon, Seung Ki Lee, Bing Yang Bi, Guijun |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Yao, Xiling Moon, Seung Ki Lee, Bing Yang Bi, Guijun |
| author_sort | Yao, Xiling |
| collection | NTU |
| description | Selective laser melting (SLM) is a powder-bed fusion additive manufacturing process that fabricates metallic parts in a layer-by-layer manner. IN718 is a nickel-based austenitic (γ) superalloy with broad applications in aerospace, chemical, and nuclear industries. In this study, fully-dense IN718-matrix composite reinforced by TiC nanoparticles were fabricated in-situ by SLM. As-built and heattreated IN718/TiC nanocomposite was compared against pure IN718 in terms of microstructures and tensile properties. Columnar and cellular microstructure morphologies in as-built pure IN718 and IN718/TiC nanocomposite were demolished by heat treatment. Microstructure refining and grain boundary dislocation pinning effect of TiC nanoparticles improved the tensile strength of as-built IN718/TiC nanocomposite. In both as-built IN718/TiC and pure IN718, γ and Laves phase are the major constituents while the other precipitates were suppressed by rapid solidification in SLM. Heat treatment dissolved Laves precipitates and grew γ'/γ'', δ, and MC/ M23C6 carbides that strengthened both pure IN718 and IN718/TiC nanocomposite. In heat-treated IN718/TiC, the TiC nanoparticles and M23C6 carbides degenerated from TiC counteracted the deficiency of δ precipitates. Therefore, heat-treated IN718/TiC nanocomposite had similar tensile strength but lower ductility than heat-treated pure IN718. |
| first_indexed | 2024-10-01T02:51:36Z |
| format | Journal Article |
| id | ntu-10356/105815 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:51:36Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/1058152023-03-04T17:21:26Z Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting Yao, Xiling Moon, Seung Ki Lee, Bing Yang Bi, Guijun School of Mechanical and Aerospace Engineering Singapore Centre for 3D Printing Additive Manufacturing IN718/TiC DRNTU::Engineering::Aeronautical engineering Selective laser melting (SLM) is a powder-bed fusion additive manufacturing process that fabricates metallic parts in a layer-by-layer manner. IN718 is a nickel-based austenitic (γ) superalloy with broad applications in aerospace, chemical, and nuclear industries. In this study, fully-dense IN718-matrix composite reinforced by TiC nanoparticles were fabricated in-situ by SLM. As-built and heattreated IN718/TiC nanocomposite was compared against pure IN718 in terms of microstructures and tensile properties. Columnar and cellular microstructure morphologies in as-built pure IN718 and IN718/TiC nanocomposite were demolished by heat treatment. Microstructure refining and grain boundary dislocation pinning effect of TiC nanoparticles improved the tensile strength of as-built IN718/TiC nanocomposite. In both as-built IN718/TiC and pure IN718, γ and Laves phase are the major constituents while the other precipitates were suppressed by rapid solidification in SLM. Heat treatment dissolved Laves precipitates and grew γ'/γ'', δ, and MC/ M23C6 carbides that strengthened both pure IN718 and IN718/TiC nanocomposite. In heat-treated IN718/TiC, the TiC nanoparticles and M23C6 carbides degenerated from TiC counteracted the deficiency of δ precipitates. Therefore, heat-treated IN718/TiC nanocomposite had similar tensile strength but lower ductility than heat-treated pure IN718. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) Accepted version 2019-06-14T03:40:04Z 2019-12-06T21:58:30Z 2019-06-14T03:40:04Z 2019-12-06T21:58:30Z 2017 Journal Article Yao, X., Moon, S. K., Lee, B. Y., & Bi, G. (2017). Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting. International Journal of Precision Engineering and Manufacturing, 18(12), 1693-1701. doi:10.1007/s12541-017-0197-y 2234-7593 https://hdl.handle.net/10356/105815 http://hdl.handle.net/10220/48751 10.1007/s12541-017-0197-y en International Journal of Precision Engineering and Manufacturing © 2017 Korean Society for Precision Engineering and Springer-Verlag GmbH Germany, part of Springer Nature. All rights reserved. This paper was published by Springer in International Journal of Precision Engineering and Manufacturing and is made available with permission of Korean Society for Precision Engineering and Springer-Verlag GmbH Germany, part of Springer Nature. 9 p. application/pdf |
| spellingShingle | Additive Manufacturing IN718/TiC DRNTU::Engineering::Aeronautical engineering Yao, Xiling Moon, Seung Ki Lee, Bing Yang Bi, Guijun Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting |
| title | Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting |
| title_full | Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting |
| title_fullStr | Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting |
| title_full_unstemmed | Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting |
| title_short | Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting |
| title_sort | effects of heat treatment on microstructures and tensile properties of in718 tic nanocomposite fabricated by selective laser melting |
| topic | Additive Manufacturing IN718/TiC DRNTU::Engineering::Aeronautical engineering |
| url | https://hdl.handle.net/10356/105815 http://hdl.handle.net/10220/48751 |
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