Abstract
The effect of boundary conditions (constant load, constant strain and elastic follow-up) on lattice strain evolution during creep in a polycrystalline austenitic stainless steel was studied using in situ neutron diffraction at 550 °C. The lattice strains were found to remain constant under constant load control. However, under constant strain and elastic follow-up control, the lattice strains relaxed the most in the elastically softest lattice plane {200} and the least in the elastically stiffest lattice plane {111}. The intergranular stresses created between different grain families were constant during creep tests irrespective of the boundary conditions with the initial applied stresses of 250 MPa.
| Original language | English |
|---|---|
| Pages (from-to) | 7929-7936 |
| Number of pages | 8 |
| Journal | Journal of Materials Science |
| Volume | 52 |
| Issue number | 13 |
| DOIs | |
| State | Published - Jul 1 2017 |
| Externally published | Yes |
Funding
This paper is dedicated to the late Professor David Smith. The authors would like to thank EDF Energy, for funding this work and for granting permission to publish this paper. Yiqiang Wang thanks to Dr. Sui Tan, Dr. Jianan Hu and Dr. Chen Bo for their help and advices. Experiments at the ENGIN-X, ISIS Pulsed Neutron Source were supported by a beamtime (RB1310146) allocation from the Science and Technology Facilities Council.
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