Simulation of hot stamping considering self-tempering
The application of ultra-high-strength steel plates to automobile bodies has progressed to achieve weight reduction and collision safety, with expanding applications of hot stamping (HS) technology for components with tensile strengths of 1.5 GPa or more. HS simulations considering phase transformat...
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EDP Sciences
2025-01-01
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| Series: | MATEC Web of Conferences |
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| Online Access: | https://www.matec-conferences.org/articles/matecconf/pdf/2025/02/matecconf_iddrg2025_01003.pdf |
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| author | Mori Keitaro Kubo Masahiro Okamura Kazuo |
| author_facet | Mori Keitaro Kubo Masahiro Okamura Kazuo |
| author_sort | Mori Keitaro |
| collection | DOAJ |
| description | The application of ultra-high-strength steel plates to automobile bodies has progressed to achieve weight reduction and collision safety, with expanding applications of hot stamping (HS) technology for components with tensile strengths of 1.5 GPa or more. HS simulations considering phase transformation for predicting formability, hardenability, and shape accuracy have been reported. The hardness of HS components obtained via die quenching is lower than that of martensitic structures obtained via water quenching, due to self-tempering from the temperature history below the martensite-transformation temperature (Ms point). Few HS simulations consider self-tempering. We established a material model to reproduce self-tempering behaviour accurately and verified hardness prediction after HS. Results: 1) The hardness of water-quenched martensite after tempering was measured, and the activation energy of the tempering reaction was calculated. Then, it became possible to linearly approximate the self-tempering martensite hardness during continuous cooling using the cumulative tempering parameter.2) We developed simulation technology of hot stamping that incorporates the effects of phase transformation, transformation plasticity, and self-tempering. By calculating the tempering parameters at each time step below the Ms point, the accuracy of hardness prediction after HS was confirmed. |
| format | Article |
| id | doaj-art-cdca1eb81ad14959a2ce9cb5784fb7e2 |
| institution | OA Journals |
| issn | 2261-236X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj-art-cdca1eb81ad14959a2ce9cb5784fb7e22025-08-20T02:26:02ZengEDP SciencesMATEC Web of Conferences2261-236X2025-01-014080100310.1051/matecconf/202540801003matecconf_iddrg2025_01003Simulation of hot stamping considering self-temperingMori Keitaro0Kubo Masahiro1Okamura Kazuo2Kyusyu R&D Laboratory, Nippon Steel CorpSteel research Laboratory, Nippon Steel CorpGraduate School of Engineering, Osaka Univ.The application of ultra-high-strength steel plates to automobile bodies has progressed to achieve weight reduction and collision safety, with expanding applications of hot stamping (HS) technology for components with tensile strengths of 1.5 GPa or more. HS simulations considering phase transformation for predicting formability, hardenability, and shape accuracy have been reported. The hardness of HS components obtained via die quenching is lower than that of martensitic structures obtained via water quenching, due to self-tempering from the temperature history below the martensite-transformation temperature (Ms point). Few HS simulations consider self-tempering. We established a material model to reproduce self-tempering behaviour accurately and verified hardness prediction after HS. Results: 1) The hardness of water-quenched martensite after tempering was measured, and the activation energy of the tempering reaction was calculated. Then, it became possible to linearly approximate the self-tempering martensite hardness during continuous cooling using the cumulative tempering parameter.2) We developed simulation technology of hot stamping that incorporates the effects of phase transformation, transformation plasticity, and self-tempering. By calculating the tempering parameters at each time step below the Ms point, the accuracy of hardness prediction after HS was confirmed.https://www.matec-conferences.org/articles/matecconf/pdf/2025/02/matecconf_iddrg2025_01003.pdfhot stampingself-temperingsimulationphase transformation |
| spellingShingle | Mori Keitaro Kubo Masahiro Okamura Kazuo Simulation of hot stamping considering self-tempering MATEC Web of Conferences hot stamping self-tempering simulation phase transformation |
| title | Simulation of hot stamping considering self-tempering |
| title_full | Simulation of hot stamping considering self-tempering |
| title_fullStr | Simulation of hot stamping considering self-tempering |
| title_full_unstemmed | Simulation of hot stamping considering self-tempering |
| title_short | Simulation of hot stamping considering self-tempering |
| title_sort | simulation of hot stamping considering self tempering |
| topic | hot stamping self-tempering simulation phase transformation |
| url | https://www.matec-conferences.org/articles/matecconf/pdf/2025/02/matecconf_iddrg2025_01003.pdf |
| work_keys_str_mv | AT morikeitaro simulationofhotstampingconsideringselftempering AT kubomasahiro simulationofhotstampingconsideringselftempering AT okamurakazuo simulationofhotstampingconsideringselftempering |