Abstract: The high temperature deformation characteristics of HR3C austenitic heat-resistant steel in ultra-supercritical power plant boiler were studied under the temperature range of 948—998 K, mean stress of 200—240 MPa and stress amplitude of 0—130 MPa. The deformation mechanism and fracture behavior of HR3C steel under high-temperature cyclic loading were elucidated. The results show that with the increasing of temperature, mean stress and stress amplitude, the minimum strain rate of HR3C steel under cyclic loading increases, and the life gradually decreases. According to the minimum strain rate characteristics, the apparent stress exponents of the sample under cyclic loading are 3.30, 4.47, 5.03, and the apparent activation energy is 460—520 kJ/mol at 948, 973 and 998 K. By extrapolation method, the threshold stresses at different temperatures was estimated to be 89, 73 and 23 MPa, respectively. By introducing threshold stresses, the true stress exponent is 3 and the true activation energy is 275—315 kJ/mol. The deformation mechanism of HR3C steel under cyclic loading is the creep deformation controlled by dislocation slip assisted by lattice diffusion. At the same time, the cumulative damage strain εd was used to modify the M-G relationship to achieve life prediction. Under constant load and cyclic load, the fracture mode of HR3C steel is ductile fracture dominated by intergranular fracture. There are a few transcrystalline cracks in the fracture morphology under cyclic loading.
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2025, Vol. 39 
