Effects of overlap rate and energy density on mechanical properties of Inconel 718 by multiple small-spot-LSP impacts

Lv, Woyun; Wang, Qingqing; Hua, Yang; Hou, Xin

doi:10.1088/2053-1591/ab0f85

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…In this paper, the main reason why LSP only slightly improved the surface’s microhardness was that the laser energy density was low, the number of shock processing was just three, and the overlap was just 20%. Lv et al [ 32 ] investigated the effects of overlap rate and energy density on mechanical properties of Inconel 718 by multiple small-spot-LSP impacts. It was concluded that the microhardness on LSP-treated surface increased with the rise of the number of impacts and the overlap rate.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Strain Fatigue Behavior for Inconel 625 with Laser Shock Peening

Sun

Han

et al. 2022

Materials

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With excellent creep resistance, high-temperature thermal strength and high-temperature fatigue strength, Inconel 625 is widely applied to fabricate structural components in the aerospace field, where fatigue life is a key point. Laser shock peening (LSP) is considered to improve the fatigue strength and fatigue crack growth resistance of metal materials. The present work was conducted to investigate the influence of LSP on strain-controlled fatigue behavior of Inconel 625. The surface microstructures of specimens before and after LSP were observed by transmission electron microscope (TEM). The strain-controlled fatigue loading tests with different strain amplitudes ranging from 0.4% to 1.2% were carried out on the specimens, and the topography of fracture appearance was examined by scanning electron microscope (SEM). The investigations showed that the specimens with LSP presented fewer crack initiations, shorter fatigue striations space and smaller dimples or micropores, which account for the enhancement of the fatigue life for the LSP specimens. Furthermore, the plastic deformation, ultra-fine grains, twins and dislocations caused by LSP could prevent crack initiation, crack propagation and ultimate fracture, hence prolonging the fatigue life of the Inconel 625. In addition, it was revealed that the cyclic strain hardening as well as cyclic strain softening remains almost the same to Inconel 625 with or without LSP.

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Section: Resultsmentioning

confidence: 99%