Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusion
Inconel 718 powder with reduced carbon content was used to manufacture coupons via laser powder bed fusion (LPBF) to study the influence of carbon content on microstructures and mechanical properties of HIP'ed and heat-treated material. The carbon concentration in this material was kept deliber...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Additive Manufacturing Letters |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772369022000123 |
| _version_ | 1797986429279666176 |
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| author | Tait D. McLouth David B. Witkin Julian R. Lohser Glenn E. Bean Paul M. Adams Zachary R. Lingley Rafael J. Zaldivar |
| author_facet | Tait D. McLouth David B. Witkin Julian R. Lohser Glenn E. Bean Paul M. Adams Zachary R. Lingley Rafael J. Zaldivar |
| author_sort | Tait D. McLouth |
| collection | DOAJ |
| description | Inconel 718 powder with reduced carbon content was used to manufacture coupons via laser powder bed fusion (LPBF) to study the influence of carbon content on microstructures and mechanical properties of HIP'ed and heat-treated material. The carbon concentration in this material was kept deliberately low (0.01 wt%) relative to a typical commercial powder composition (0.04 wt%) of IN718 in order to minimize the precipitation of primary carbides during post-processing heat treatments, which have been observed to be deleterious to elevated temperature mechanical properties such as elongation, stress rupture ductility, and notch sensitivity. The final microstructure of the lean C alloy is shown to have a significantly reduced NbC population relative to the baseline material. Furthermore, other microstructural variations such as an increased δ phase population and decreased γ’’ particle size were observed. Empirical observations agreed with microstructural simulations calculated by the ThermoCalc/TC-PRISMA precipitation module. These changes to the microstructure resulted in a 10% increase in the yield strength at both 25 and 650 °C in the lean C alloy, bringing the strength of LPBF-printed material closer to that of wrought IN718. Overall, the reduction in carbon content in the raw material has significant effects beyond limiting the pre-solution treatment precipitation of NbC, primarily by freeing Nb for formation of δ and γ’’ phases. |
| first_indexed | 2024-04-11T07:33:42Z |
| format | Article |
| id | doaj.art-07b6ed53fdb745b6aed8ee0719a30077 |
| institution | Directory Open Access Journal |
| issn | 2772-3690 |
| language | English |
| last_indexed | 2024-04-11T07:33:42Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Additive Manufacturing Letters |
| spelling | doaj.art-07b6ed53fdb745b6aed8ee0719a300772022-12-22T04:36:47ZengElsevierAdditive Manufacturing Letters2772-36902022-12-013100037Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusionTait D. McLouth0David B. Witkin1Julian R. Lohser2Glenn E. Bean3Paul M. Adams4Zachary R. Lingley5Rafael J. Zaldivar6Corresponding author.; The Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 90245, USAThe Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 90245, USAThe Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 90245, USAThe Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 90245, USAThe Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 90245, USAThe Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 90245, USAThe Aerospace Corporation, 2310 E. El Segundo Blvd., El Segundo, CA 90245, USAInconel 718 powder with reduced carbon content was used to manufacture coupons via laser powder bed fusion (LPBF) to study the influence of carbon content on microstructures and mechanical properties of HIP'ed and heat-treated material. The carbon concentration in this material was kept deliberately low (0.01 wt%) relative to a typical commercial powder composition (0.04 wt%) of IN718 in order to minimize the precipitation of primary carbides during post-processing heat treatments, which have been observed to be deleterious to elevated temperature mechanical properties such as elongation, stress rupture ductility, and notch sensitivity. The final microstructure of the lean C alloy is shown to have a significantly reduced NbC population relative to the baseline material. Furthermore, other microstructural variations such as an increased δ phase population and decreased γ’’ particle size were observed. Empirical observations agreed with microstructural simulations calculated by the ThermoCalc/TC-PRISMA precipitation module. These changes to the microstructure resulted in a 10% increase in the yield strength at both 25 and 650 °C in the lean C alloy, bringing the strength of LPBF-printed material closer to that of wrought IN718. Overall, the reduction in carbon content in the raw material has significant effects beyond limiting the pre-solution treatment precipitation of NbC, primarily by freeing Nb for formation of δ and γ’’ phases.http://www.sciencedirect.com/science/article/pii/S2772369022000123Additive manufacturingInconel 718Mechanical propertiesLow carbon content |
| spellingShingle | Tait D. McLouth David B. Witkin Julian R. Lohser Glenn E. Bean Paul M. Adams Zachary R. Lingley Rafael J. Zaldivar Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusion Additive Manufacturing Letters Additive manufacturing Inconel 718 Mechanical properties Low carbon content |
| title | Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusion |
| title_full | Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusion |
| title_fullStr | Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusion |
| title_full_unstemmed | Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusion |
| title_short | Influence of reduced carbon content on microstructure and mechanical behavior of Inconel 718 prepared by laser powder bed fusion |
| title_sort | influence of reduced carbon content on microstructure and mechanical behavior of inconel 718 prepared by laser powder bed fusion |
| topic | Additive manufacturing Inconel 718 Mechanical properties Low carbon content |
| url | http://www.sciencedirect.com/science/article/pii/S2772369022000123 |
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