Abstract
The creep properties of ferritic Fe–19Cr–4Ni–2Al alloy at 873–973 K under an applied stress range of 70–270 MPa were investigated. The results showed that the alloy exhibits two apparent stress exponents for creep: one in the lower stress regime ( n=2.54) and the other in the higher stress region ( n=11). This was the typical characteristic of precipitation-hardened alloys that exhibit a pronounced transition in the stress vs. creep rate relationship. Moreover, the activation energies for creep ( Q) at lower and higher stresses regimes were determined to be 298 and 644 kJ/mol, respectively. Transmission electron microscopy (TEM) examination revealed the precipitation of ordered β′(NiAl)-type particles during creep deformation at the high stresses regime.
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