Conference Proceedings Paper
CREEP PROPERTIES AND TEM CHARACTERIZATION OF 347H STAINLESS STEEL
36th Annual CNS Conference - 2016 June 19-22
B. Shalchi Amirkhiz (NRCan - CanmetMaterials)
S. Xu (NRCan - CanmetMaterials)
J. Liang (NRCan - CanmetMaterials)
C. Bibby (NRCan - CanmetMaterials)
Creep properties of a recent 347H austenitic stainless steel plate at 1073 K (800°C) and 1123 K (850 °C) were examined, and microstructural evolution under temperature and creep was characterized using TEM. Creep minimum rate vs. stress plot at 1123 K (850 °C) showed two different slope regions, suggesting a change in the creep-rate controlling mechanism at lower stresses. Detailed TEM characterization showed that in high-stress (or short-term) creep tests, NbC precipitates interacted with dislocations and indicated to slow down the dislocation-controlled creep by orienting towards slip directions. In low-stress (long-term) creep tests, formation of ferrite on NbC was observed and no sigma phase was detected. In long-term low stress creep tests, NbC precipitates gave way to formation of Widmanstatten Cr2N and Z-phase precipitates, and the rate-controlling mechanism may change to grain boundary sliding.
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