Abstract
A static cast ingot of type 316 stainless steel was tested at 811, 866, and 922 K. Creep curves for this material under certain temperature and stress conditions show instantaneous increase in strain. In the open literature this increase has been called “strain burst” or “jump”. The number of “bursts” per curve varied from 0 to 3, and the instantaneous strain was as large as 2 pct. The bursts generally occurred at high stresses and at the two lower test temperatures, 811 and 866 K. The rupture time for specimens showing bursts was lower than for specimens without them. The creep-rupture strength of the static casting was approximately 40 MPa lower than that for wrought material. The rupture time of the casting was a strong function of specimen location. The fine grained structure near the ingot edge produced longer rupture time compared with the coarse grain structure. Microprobe analysis showed significant variation in chromium, nickel, and molybdenum across the dendritic regions. The inhomogeneous distribution of the potent creep-strengthening element molybdenum has been suggested as responsible for the strain bursts.
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