OBRABOTKAMETALLOV technology Vol. 27 No. 1 2025 Fig. 11. Low-cycle fatigue diagram for the VV751P alloy (an arrow indicates a run-out sample that did not fracture after the specified number of cycles) Ta b l e 2 Results of cyclic tests of VV751P alloy Mode No. stresses in the loading cycle Number of cycles Result kN MPa 1 0.75 263 2.50E+05 undestroyed 2 1 351 1.74E+05 destroyed 3 2 702 1.90E+04 destroyed 4 1.5 526 4.18E+04 destroyed 5 1.2 421 1.62E+05 destroyed 6 1.1 386 92700 destroyed and intensity of crack formation on the surface of heat-resistant nickel alloy VV751P. The presence of cracks on the surface negatively affects the performance of products made of heat-resistant nickel alloys. Cyclic low-cycle fatigue tests were conducted to determine the time, nature, and mechanism of failure under cyclic loads on critical products made of functional materials. Low-cycle fatigue reflects failure under elastoplastic deformation of the product. The cyclic test data are shown in Table 2, and the fatigue diagram is shown in Fig. 11. The study revealed that at a loading amplitude of 400 MPa, the average number of cycles to failure reached 1.50E+05 cycles. A decrease in the number of cycles to failure was observed with increasing loading amplitude. The arrow in the graph indicates the specimen that did not fail within the given number of cycles. Conclusions Analysis of the defective layer (white layer) of the samples revealed that the thickness of this layer remains consistent at approximately 10 μm after WEDM, regardless of the processing mode.
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