High-resolution characterisation of chemically complex low alloyed high strength martensitic steels
|Coordinator||Swerim AB - Swerim AB, Kista|
|Funding from Vinnova||SEK 500 000|
|Project duration||November 2018 - November 2019|
|Venture||Research infrastructure - utilisation and collaboration|
|Call||Industriella pilotprojekt för neutron- och fotonexperiment vid storskalig forskningsinfrastruktur 2018|
Purpose and goal
The purpose with the new experiments is to provide a greater understanding of the precipitation processes occurring in low-alloyed high-strength martensitic steels. The precipitation process in these steels is complicated, and combinations of characterisation techniques are needed in order to provide information on all type of reactions. The experimental data provided in this project can also be used to predict the precipitation, which can then be used on other alloys or heat treatments as well.
Expected results and effects
The industrial interest is to understand the precipitation processes that occur in high-strength low-alloyed steels during tempering, typically at 500-600ºC. At precipitation tiny nanometer sized particles rich on molybdenum and vanadium gives a hardness increase to the material. It is of greatest interest for a steel producer like SSAB to carefully study and to characterise the particle structure in these commercial steels, and to use the information for alloy development of new steel concepts.
Planned approach and implementation
The proposed work using Anomalous Small Angle X-ray Scattering (ASAXS), will complement previous work using electron microscopy, atom probe and previous neutron scattering experiments (SANS). Due to the complexity of the reactions occurring in these commercial steels, more detailed information is needed in order to investigate, and to isolate, the scattering contribution from molybdenum and vanadium rich carbides. Experiments are planned at Advanced Photon Sources APS (Lemont IL, USA). Partners are SSAB EMEA AB, Swerim AB and KTH.