Effect of pulse frequency in laser shock peening on roughness and residual stresses of nickel alloy specimens

Fri, 29 May 2026 00:00:00 +0400

The effect of pulse frequency during laser shock peening on microhardness, roughness, crushing and residual stresses of the surface layer of flat nickel alloy samples is considered. Laser shock peening was performed by a low-power Nd:YAG laser with a pulse duration of 10 ns on one side of the sample. Acrylic paint was used as a protective layer. It was found that laser shock peening at a low frequency led to large compressive residual stresses of –0.44…–0.28 rel. units compared to other laser pulse frequencies. At a frequency of 3 Hz, laser impact treatment leads to a minimum compression depth (reduction in sample thickness) of 7.62 μm. Roughness after laser shock peening in all processing modes from 0.32 μm to 0.90 ... 1.50 μm. Microhardness increased by 1.2 ... 2.0 times. It is recommended to include an allowance for laser shock peening of 7...10 µm.
EDN: LIQYDT, https://elibrary/liqydt

Comparison of mechanical and corrosion characteristics of alumin alloy D16 after different types of age hardening

Mon, 01 Jun 2026 00:00:00 +0400

This paper examines the mechanical and corrosion properties of D16 aluminum alloy after natural and artificial age hardening to maximum strength. The yield strength for these heat treatments differs only slightly. Rockwell hardness measurements revealed that natural age hardening is most intense during the first 30 minutes, after which it subsides, but continues for up to 8220 minutes. Accelerated fatigue testing using the Lokati method was conducted on non-standard specimens with a lower theoretical stress concentration factor. The loading type was tension-compression. Tests were conducted in air at room temperature with a cycle asymmetry of R = -1. Fatigue testing allowed us to determine fatigue limits, which differ to a greater extent than other mechanical properties. Corrosion testing in an environment supersaturated with chloride ions revealed significant differences in the depth and number of pits for specimens subjected to different age hardening processes.
EDN: GMXHZJ, https://elibrary/gmxhzj

Mechanical Engineering and Machine Science. Vestnik MGTU

Effect of pulse frequency in laser shock peening on roughness and residual stresses of nickel alloy specimens

Comparison of mechanical and corrosion characteristics of alumin alloy D16 after different types of age hardening