A three-stage mechanistic model for solidification cracking during welding of steel
A three-stage mechanistic model for solidification cracking during TIG welding of steel is proposed from in situ synchrotron X-ray imaging of solidification cracking and subsequent analysis of fracture surfaces. Stage 1—Nucleation of inter-granular hot cracks: cracks nucleate inter-granularly in sub...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
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Springer Verlag
2018
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| _version_ | 1797082877787111424 |
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| author | Aucott, L Huang, D Wen, S Marsden, J Dong, H Rack, A Cocks, A |
| author_facet | Aucott, L Huang, D Wen, S Marsden, J Dong, H Rack, A Cocks, A |
| author_sort | Aucott, L |
| collection | OXFORD |
| description | A three-stage mechanistic model for solidification cracking during TIG welding of steel is proposed from in situ synchrotron X-ray imaging of solidification cracking and subsequent analysis of fracture surfaces. Stage 1—Nucleation of inter-granular hot cracks: cracks nucleate inter-granularly in sub-surface where maximum volumetric strain is localized and volume fraction of liquid is less than 0.1; the crack nuclei occur at solute-enriched liquid pockets which remain trapped in increasingly impermeable semi-solid skeleton. Stage 2—Coalescence of cracks via inter-granular fracture: as the applied strain increases, cracks coalesce through inter-granular fracture; the coalescence path is preferential to the direction of the heat source and propagates through the grain boundaries to solidifying dendrites. Stage 3—Propagation through inter-dendritic hot tearing: inter-dendritic hot tearing occurs along the boundaries between solidifying columnar dendrites with higher liquid fraction. It is recommended that future solidification cracking criterion shall be based on the application of multiphase mechanics and fracture mechanics to the failure of semi-solid materials. |
| first_indexed | 2024-03-07T01:34:07Z |
| format | Journal article |
| id | oxford-uuid:9490e77b-19ec-4194-871c-8a797cd9cc7e |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:34:07Z |
| publishDate | 2018 |
| publisher | Springer Verlag |
| record_format | dspace |
| spelling | oxford-uuid:9490e77b-19ec-4194-871c-8a797cd9cc7e2022-03-26T23:40:15ZA three-stage mechanistic model for solidification cracking during welding of steelJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:9490e77b-19ec-4194-871c-8a797cd9cc7eSymplectic Elements at OxfordSpringer Verlag2018Aucott, LHuang, DWen, SMarsden, JDong, HRack, ACocks, AA three-stage mechanistic model for solidification cracking during TIG welding of steel is proposed from in situ synchrotron X-ray imaging of solidification cracking and subsequent analysis of fracture surfaces. Stage 1—Nucleation of inter-granular hot cracks: cracks nucleate inter-granularly in sub-surface where maximum volumetric strain is localized and volume fraction of liquid is less than 0.1; the crack nuclei occur at solute-enriched liquid pockets which remain trapped in increasingly impermeable semi-solid skeleton. Stage 2—Coalescence of cracks via inter-granular fracture: as the applied strain increases, cracks coalesce through inter-granular fracture; the coalescence path is preferential to the direction of the heat source and propagates through the grain boundaries to solidifying dendrites. Stage 3—Propagation through inter-dendritic hot tearing: inter-dendritic hot tearing occurs along the boundaries between solidifying columnar dendrites with higher liquid fraction. It is recommended that future solidification cracking criterion shall be based on the application of multiphase mechanics and fracture mechanics to the failure of semi-solid materials. |
| spellingShingle | Aucott, L Huang, D Wen, S Marsden, J Dong, H Rack, A Cocks, A A three-stage mechanistic model for solidification cracking during welding of steel |
| title | A three-stage mechanistic model for solidification cracking during welding of steel |
| title_full | A three-stage mechanistic model for solidification cracking during welding of steel |
| title_fullStr | A three-stage mechanistic model for solidification cracking during welding of steel |
| title_full_unstemmed | A three-stage mechanistic model for solidification cracking during welding of steel |
| title_short | A three-stage mechanistic model for solidification cracking during welding of steel |
| title_sort | three stage mechanistic model for solidification cracking during welding of steel |
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