Effect of Loading Rate on Low-Cycle Fatigue Properties of Turbine Rotor Steel

Low-cycle fatigue properties of 30Cr1Mo1V steam turbine rotor steel were studied by RDLO5 electronic creep fatigue test machine at 0.1%.S-1, 0.5%.s(-1) loading rates applied the total strain controlled method. The results involve that with the loading rate increases at 538 degrees C, cyclic stress of the rotor steel increases, and low-cycle fatigue life increases too; in the same strain range values, the increasing loading rate leads to the greater stress amplitude; with the increase of the strain range values, the stress increases and the low-cycle fatigue life decreases. The relationship of stress-strain and the loading rate is Delta sigma =2051.56 Delta epsilon(0.06427)(p)(epsilon) over dot(0.07735) , the relationship of low-cycle fatigue life and the loading rate is Delta epsilon(t) =0.8777 N-f(-0.6147)(epsilon) over dot(0.1627) + 0.0 106 N-f(-0.11917)(epsilon) over dot(0.03156) (C) 2014 Published by Elsevier Ltd.