Low-cycle fatigue strength of 10GN2MFA steel with a single-layer corrosion-resisting coating produced by electroslag strip cladding

Abstract

The method of testing the uniform single-layer corrosion resisting coating, produced by electroslag strip cladding on 10GN2MFA steel, on the resistance to low-cycle fatigue strength using special specimens is described. Tests were carried out at a temperature of 20 °C with the symmetric axial tension–compression loading cycle (Re = –1) with the given amplitude of the parent and cladding metal. The tests were carried out in the strain amplitude range εa = 0.28–0.8%, the number of cycles to the initiation of a crack was Ni = 340–16,000 cycles, loading frequency f = (0.25–2.0). The area of formation of the cracks was recorded in the experiments. In most cases, the cracks formed in the heat-affected zone in the vicinity of the fusion line and propagated in both the parent and deposited metal. The results show that in the range of low-cycle fatigue for the investigated 10GN2MFA steel with a deposited layer, the calculation coefficient of the decrease of the cyclic strength of the metal with a deposited layer in relation to the fatigue curve for the carbon and alloyed steel with 0.8 ≤ σ0.2/σB ≤ 0.9, the value φS = 0.68 should be used in the calculations.