Abstract
Creep tests and constant load rate tensile tests at cryogenic temperatures were carried out on austenitic stainless steels AISI304L, 310S and 316L. A creep rate of ≈ 10 −9 s −1 was observed in a 200 h creep test under the proof stress of the materials at 77 K. The creep rate at 4 K was decreased to a tenth of that at 77 K. However, an abrupt and large deformation occurs in a constant load rate tensile test at 4 K. The magnitude of the abrupt deformation depends on the work-hardening rate and the stablity of the austenitic phase. Higher proof stress materials, especially AISI310S, do not always show better characteristics for the creep or the abrupt deformation at 4 K.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have