Analysis of strain age cracking using tomography and 3D-XRD
| Reference number | |
| Coordinator | Malmö universitet - Fakulteten för teknik och samhälle |
| Funding from Vinnova | SEK 495 000 |
| Project duration | August 2019 - September 2021 |
| 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 | 2019-02584__GKN Aerospace .pdf (pdf, 419 kB) |
Purpose and goal
The purpose of the project has been to increase the understanding of the occurrence of strain and aging cracks. For this, test pieces with different heat treatment have been loaded. The results from the experiment have provided information on how the stiffness of the grains affects the formation of cracks. To investigate the effect of volumetric strains, specimens have been heat-treated in-situ in a synchrotron under load. The preliminary results show successful experiments that increase the understanding of the appearance of elongation and aging cracks.
Expected results and effects
The conclusions drawn from the SAXS, 3DXRD and tomography data are that an increase in grain stiffness because of precipitation is not the only mechanism for SAC to occur. Rather it is suggested that several mechanisms at various length scales are responsible for this phenomena.
Planned approach and implementation
The approach has been to analyze two common hypotheses for strain age cracking by utilizing synchrotron system. For this, two experiments at p21.2 the Swedish material science beamline were performed in 2020 and 2021. In both experiments, SAXS, 3DXRD and tomography were performed. It is difficult to perform good experiments if several length scales are to be studied simultaneously.