Irradiation creep of Fe-25Ni-15Cr during 10 MeV deuteron bombardment

Irradiation creep of Fe-25Ni-15Cr-0.07C and a Ti-modified counterpart has been investigated using a tensile creep rig and a 10 MeV deuteron beam generated by a small cyclotron. The creep rates found in the Fe-25Ni-15Cr-0.07C alloy are relatively large compared to those of 316 stainless steels, while the Ti-modified alloy shows a smaller creep rate. The result suggests that the Ni content of 25% solely does not improve the creep resistance but that the minor elements such as Ti would play an important role in suppressing the creep. The stress exponent of creep rate tends to change from linear to quadratic at about 150 MPa. The observed stress dependence may be qualitatively explained in terms of the SIPA and the PAG models, but, quantitatively, there exists considerable disagreement especially for the high stress region. (orig.)