5. Results
5.1. Creep behavior analysis
The obtained creep curves are shown in Figure 1, and the obtained
minimum creep rate and rupture time are summarized in Table 2. The
rupture time varies from 17 hours to 942 hours, which increases with the
decrease of the applied stress at the same temperature. It can be seen
from specimens 8, 13, and specimens 9, 14, 15 that obvious scatter of
creep data exists. The origin of the scatter comes from many sources,
such as the fluctuation of test conditions, surface roughness, grain
size and inhomogeneous microstructure41,42.