Phase transformations and control of residual stresses in thick spray-formed steel shells
Large, thick steel shells for tooling applications have been produced using a robot manipulated electric arc spraying technique with steady-state temperatures ranging from 170°C to 450°C. Critical to these experiments has been the use of a real-time feedback control system for surface temperature ba...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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2004
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| _version_ | 1797097012995293184 |
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| author | Rayment, T Hoile, S Grant, P |
| author_facet | Rayment, T Hoile, S Grant, P |
| author_sort | Rayment, T |
| collection | OXFORD |
| description | Large, thick steel shells for tooling applications have been produced using a robot manipulated electric arc spraying technique with steady-state temperatures ranging from 170°C to 450°C. Critical to these experiments has been the use of a real-time feedback control system for surface temperature based on infrared thermal imaging. There was a reproducible trend in net residual shell distortion as a function of temperature with residual tensile stresses in the shell for temperatures ≤210°C and ≥390°C, and net compressive stresses at intermediate temperatures. In-situ linear displacement sensor experiments have been used to investigate the dynamic distortion of sprayed steel shells on steel substrates, over the same range of surface temperatures. Residual and in-situ distortion measurements confirmed two manufacturing temperatures at which stresses in the steel shells were either minimized or eliminated. A numerical model has been developed to relate shell quench and transformations stresses to the shell dynamic distortion behavior. It is proposed that tensile quench stresses are balanced by the time- and temperature-dependent expansive austenite-to-bainite phase transformation. |
| first_indexed | 2024-03-07T04:49:36Z |
| format | Journal article |
| id | oxford-uuid:d4839d2c-aeb2-4d8c-8914-4345d742e0bc |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:49:36Z |
| publishDate | 2004 |
| record_format | dspace |
| spelling | oxford-uuid:d4839d2c-aeb2-4d8c-8914-4345d742e0bc2022-03-27T08:19:03ZPhase transformations and control of residual stresses in thick spray-formed steel shellsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d4839d2c-aeb2-4d8c-8914-4345d742e0bcEnglishSymplectic Elements at Oxford2004Rayment, THoile, SGrant, PLarge, thick steel shells for tooling applications have been produced using a robot manipulated electric arc spraying technique with steady-state temperatures ranging from 170°C to 450°C. Critical to these experiments has been the use of a real-time feedback control system for surface temperature based on infrared thermal imaging. There was a reproducible trend in net residual shell distortion as a function of temperature with residual tensile stresses in the shell for temperatures ≤210°C and ≥390°C, and net compressive stresses at intermediate temperatures. In-situ linear displacement sensor experiments have been used to investigate the dynamic distortion of sprayed steel shells on steel substrates, over the same range of surface temperatures. Residual and in-situ distortion measurements confirmed two manufacturing temperatures at which stresses in the steel shells were either minimized or eliminated. A numerical model has been developed to relate shell quench and transformations stresses to the shell dynamic distortion behavior. It is proposed that tensile quench stresses are balanced by the time- and temperature-dependent expansive austenite-to-bainite phase transformation. |
| spellingShingle | Rayment, T Hoile, S Grant, P Phase transformations and control of residual stresses in thick spray-formed steel shells |
| title | Phase transformations and control of residual stresses in thick spray-formed steel shells |
| title_full | Phase transformations and control of residual stresses in thick spray-formed steel shells |
| title_fullStr | Phase transformations and control of residual stresses in thick spray-formed steel shells |
| title_full_unstemmed | Phase transformations and control of residual stresses in thick spray-formed steel shells |
| title_short | Phase transformations and control of residual stresses in thick spray-formed steel shells |
| title_sort | phase transformations and control of residual stresses in thick spray formed steel shells |
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