3D phase mapping of austenite-martensite transition in 3rd generation advanced high strength steel.
| Reference number | |
| Coordinator | SWERIM AB - Swerim AB, Kista |
| Funding from Vinnova | SEK 414 894 |
| Project duration | August 2019 - February 2022 |
| Status | Completed |
| Venture | Research infrastructure - utilisation and collaboration |
| Call | Industrial pilot projects for utilisation of neutron- and photon based techniques at large scale infrastructures - spring 2019 |
| End-of-project report | 2019-02576_SSAB EMEA AB.pdf (pdf, 523 kB) |
Purpose and goal
Using the neutron beam sources at J-PARC in Japan and ISIS in the UK, the transformation from retained austenite to martensite could be followed in a 3rd generation AHS steel, developed by industry partner SSAB, by analyzing the resulting Bragg edge data. The amount of retained austenite was verified using traditional XRD.
Expected results and effects
The results showed that it is quite possible to follow the deformation driven transformation of retained austenite to martensite by using a neutron source and analyzing Bragg edge data.
Planned approach and implementation
Tensile specimens of 3rd generation AHS steel were heat treated in lab furnace to obtain retained austenite. These specimens were then drawn in a tensile tester, where the test was stopped at different elongations. Characterization was then done using neutron beam source and gathering of the resulting Bragg edge data. Verification testing was done with XRD. From the beginning, it was intended to do tensile testing in-situ, but this could not be carried out due to restrictions on travel and presence at the instrument. The test was instead performed by staff on site at J-PARC and ISIS.