On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys
The susceptibility of nickel-based superalloys to processing-induced crack formation during laser powder-bed additive manufacturing is studied. Twelve different alloys—some of existing (heritage) type but also other newly-designed ones—are considered. A strong inter-dependence of alloy composition a...
| Glavni autori: | , , , , , , , |
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| Format: | Journal article |
| Jezik: | English |
| Izdano: |
Springer
2022
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| _version_ | 1826303100339617792 |
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| author | Ghoussoub, JN Tang, YT Dick-Cleland, WJB Nemeth, AAN McCartney, DG Gong, Y Cocks, ACF Reed, RC |
| author_facet | Ghoussoub, JN Tang, YT Dick-Cleland, WJB Nemeth, AAN McCartney, DG Gong, Y Cocks, ACF Reed, RC |
| author_sort | Ghoussoub, JN |
| collection | OXFORD |
| description | The susceptibility of nickel-based superalloys to processing-induced crack formation during laser powder-bed additive manufacturing is studied. Twelve different alloys—some of existing (heritage) type but also other newly-designed ones—are considered. A strong inter-dependence of alloy composition and processability is demonstrated. Stereological procedures are developed to enable the two dominant defect types found—solidification cracks and solid-state ductility dip cracks—to be distinguished and quantified. Differential scanning calorimetry, creep stress relaxation tests at 1000 °C and measurements of tensile ductility at 800 °C are used to interpret the effects of alloy composition. A model for solid-state cracking is proposed, based on an incapacity to relax the thermal stress arising from constrained differential thermal contraction; its development is supported by experimental measurements using a constrained bar cooling test. A modified solidification cracking criterion is proposed based upon solidification range but including also a contribution from the stress relaxation effect. This work provides fundamental insights into the role of composition on the additive manufacturability of these materials. |
| first_indexed | 2024-03-07T05:57:30Z |
| format | Journal article |
| id | oxford-uuid:eb08d390-fa58-45dd-974d-40fa13c21d8d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:57:30Z |
| publishDate | 2022 |
| publisher | Springer |
| record_format | dspace |
| spelling | oxford-uuid:eb08d390-fa58-45dd-974d-40fa13c21d8d2022-03-27T11:06:38ZOn the influence of alloy composition on the additive manufacturability of Ni-Based superalloysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:eb08d390-fa58-45dd-974d-40fa13c21d8dEnglishSymplectic ElementsSpringer2022Ghoussoub, JNTang, YTDick-Cleland, WJBNemeth, AANMcCartney, DGGong, YCocks, ACFReed, RCThe susceptibility of nickel-based superalloys to processing-induced crack formation during laser powder-bed additive manufacturing is studied. Twelve different alloys—some of existing (heritage) type but also other newly-designed ones—are considered. A strong inter-dependence of alloy composition and processability is demonstrated. Stereological procedures are developed to enable the two dominant defect types found—solidification cracks and solid-state ductility dip cracks—to be distinguished and quantified. Differential scanning calorimetry, creep stress relaxation tests at 1000 °C and measurements of tensile ductility at 800 °C are used to interpret the effects of alloy composition. A model for solid-state cracking is proposed, based on an incapacity to relax the thermal stress arising from constrained differential thermal contraction; its development is supported by experimental measurements using a constrained bar cooling test. A modified solidification cracking criterion is proposed based upon solidification range but including also a contribution from the stress relaxation effect. This work provides fundamental insights into the role of composition on the additive manufacturability of these materials. |
| spellingShingle | Ghoussoub, JN Tang, YT Dick-Cleland, WJB Nemeth, AAN McCartney, DG Gong, Y Cocks, ACF Reed, RC On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys |
| title | On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys |
| title_full | On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys |
| title_fullStr | On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys |
| title_full_unstemmed | On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys |
| title_short | On the influence of alloy composition on the additive manufacturability of Ni-Based superalloys |
| title_sort | on the influence of alloy composition on the additive manufacturability of ni based superalloys |
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