Interphase precipitation HSLA steels
|Coordinator||Uppsala Synchrotronix AB - c/o Edwards Science & Technology AB|
|Funding from Vinnova||SEK 98 582|
|Project duration||June 2019 - October 2019|
|Venture||Research infrastructure - utilisation and collaboration|
|Call||Industrial pilot projects for utilisation of neutron- and photon based techniques at large scale infrastructures - spring 2019|
Purpose and goal
We have investigated the possibilities to study precipitation in-situ following both austenite to ferrite phase transformation and precipitation simultaneously by doing realistic in-situ experiments at synchrotron radiation facilities mimicking the finishing mill and the cooling process conditions. It is desirable to establish if interphase precipitation is dominant or if precipitation also occurs in the ferrite. A roadmap towards in-situ synchrotron experiments with combined scattering (SAXS and WAXS) has been drafted and beam time has been applied for at P21 at PETRA-III.
Expected results and effects
The pre-study has resulted in four deliverables: a background technology document from SSAB, a survey of experimental capabilities, a roadmap towards realistic in-situ measurements and a beam time proposal. We have limited the investigations to X-ray tomography and scattering techniques (SAXS, WAXS), which are suited for studies of the micro-scale grain structure and the nano-sized precipitates, respectively. These techniques can in principle be applied for in-situ experiments involving mechanical loading at high temperatures and cooling.
Planned approach and implementation
The pre-study was performed during slightly more than three months. The parties in the project were SSAB, Uppsala Synchrotronix (USync) and Lund University (LU). The activities comprised investigations regarding ex-situ and in-situ measurements at synchrotron beamlines, discussions in tele conferences, and a workshop in Lund including a visit at MAX IV. Outside the project plan, Stephen Hall did preparatory tomography measurements in his laboratory at LU. A sample was also tested at PETRA-III and a strong signal was received which is very positive for future measurements.