OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 27 No. 2 2025 Fig. 7. Micro-strain as a function of processing time for cast and additively manufactured ZhS6U alloy samples after low frequency impact processing Fig. 8. Micro-strain as a function of processing time for cast and additively manufactured ZhS6U alloy samples after high frequency impact processing was 0.09 % and 0.1 % after 5 and 10 minutes of HF impact treatment, respectively, increasing to 0.11 % with a 20-minute HF treatment time. For the additively manufactured alloy samples, the average lattice strain after 5 and 10 minutes of HF impact treatment was 0.2 %, increasing to 0.24 % after 20 minutes of treatment. Fig. 9 presents the dependence of microstress on treatment time at low frequencies for the cast and additively manufactured ZhS6U alloy samples. The curves indicate similar microstress values for both materials in the initial condition. After LF impact treatment, the microstress in the cast ZhS6U samples was approximately 160 MPa, increasing to 220 MPa with increasing treatment time. Therefore, LF impact treatment induces the development of second-order stresses compared to the initial state (~140 MPa) of the cast nickel alloy. In the ZhS6U samples obtained by EBAM, the microstress after LF impact treatment was approximately 300 MPa, increasing to 600 MPa with an increase in treatment time to 40 seconds. Thus, LF impact treatment of the EBAM- obtained alloy also leads to the development of second-order stresses to a greater extent compared to the initial state (~160 MPa) of the alloy. Fig. 10 presents the dependence of microstress on treatment time at high frequencies for the cast and additivelymanufactured ZhS6U alloy samples. Similar to the LF treatment (Fig. 9), themicrostress–treatment time relationship during HF treatment reveals a significant difference between the cast and additively manufactured nickel alloys. Specifically, in the cast nickel alloy samples after HF impact treatment, the lattice microstress was approximately 185 MPa, increasing smoothly to 230 MPa with increasing treatment time. For the additively manufactured nickel alloy samples after HF impact treatment, the lattice microstress increased to 410 MPa, and with the treatment time increasing to 20 minutes, the microstress increased by
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