Abstract
Real-time in situ neutron diffraction was performed on an austenitic stainless steel under cyclic loading at room temperature. The evolutions of individual phase stresses during martensitic transformation were derived from the lattice parameters and volume fraction based on Rietveld refinements and Hooke's law, while the phase-specific dislocation densities were elucidated by the single peak broadenings. Both results reveal that the increasing content of martensite phase, instead of individual phase strengthening, should be accounted for the remarkable secondary cyclic hardening.
| Original language | English |
|---|---|
| Pages (from-to) | 45-48 |
| Number of pages | 4 |
| Journal | Scripta Materialia |
| Volume | 89 |
| DOIs | |
| State | Published - Oct 15 2014 |
Funding
This work was carried out at SNS, ORNL, supported by the U.S. Department of Energy, Basic Energy Sciences, Scientific User Facilities Division. D.Y. is grateful to the China Scholarship Council for financial support during his visit to SNS, ORNL. The authors thank Dr. H. Bei, Dr. W. Wu and Ms. H. Yang from ORNL for their technical help in this research.
Keywords
- Austenitic steels
- Cyclic hardening
- Low cycle fatigue
- Martensitic phase transformation
- Neutron diffraction