Residual stress analysis for development of hydrogen embrittlement resistant high strength steels
| Reference number | |
| Coordinator | SSAB EMEA AB - SSAB Special Steel |
| Funding from Vinnova | SEK 497 000 |
| Project duration | November 2018 - November 2019 |
| Status | Completed |
| Venture | Research infrastructure - utilisation and collaboration |
| Call | Research infrastructure - utilisation and collaboration: Industrial pilot projects for neutron and photon experiments at large scale research infrastructures - 2018 |
| End-of-project report | 2018-04427_SSAB_Special_Steels2.pdf (pdf, 139 kB) |
Important results from the project
** Denna text är maskinöversatt ** The aim of the project has been to illustrate the potential and reliability of residual stresses analysis with neutron diffraction (ND) for industry and the project partners have significantly increased their competence in this measurement method. The direct aim was to analyze macro and micro residual stresses with ND in high-strength wear steel after various steps in the manufacturing process: after curing, after tempering and after direction. Very good measurement data has been obtained, especially for macro stresses measured by the thickness of the plate.
Expected long term effects
** Denna text är maskinöversatt ** The successful results have been compared with FEA calculations with good consistency, which is important for continued FE modeling. in the investigated high-strength steels. Methods for evaluation of residual stress data for ND have been developed and will be used for future measurements.
Approach and implementation
Local micro- and macro stresses have been studied using neutron diffraction after quenching, tempering and levelling of a high strength wear steel. The measurements were performed through the plate thickness and in various directions. Diffraction data was recorded using the Engine-X diffractometer at ISIS, Oxfordshire UK. From the neutron time of flight data, the bcc cubic cell parameters were evaluated, and from this, the residual strain and stress at each measurement depth could be calculated.