Characteristics of surface layers formed on inconel 718 by laser shock peening with and without a protective coating

Gill, Amrinder S.; Telang, Abhishek; Vasudevan, Vijay K.

doi:10.1016/j.jmatprotec.2015.06.026

Cited by 123 publications

(40 citation statements)

References 11 publications

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“…Figure 5 shows the 3D optical surface profile images of the untreated (a) and treated (b) samples. It is evident [and consistent with the literature (Ref 4,5)] that the LSP treatment increases the roughness of the surface. The increase in surface roughness is a consequence of the combined effect of the laser pulse pressure and the ablative nature of the laser process.…”

Section: Resultssupporting

confidence: 89%

Effect of Laser Shock Peening on the Microstructure and Properties of the Inconel 625 Surface Layer

Rozmus-Górnikowska

Kusiński

Cieniek

2020

J. of Materi Eng and Perform

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The aim of this work was to investigate the influence of laser shock peening on the topography, microstructure, surface roughness and the mechanical properties of the Inconel 625 nickel alloy. Examination of the topography and microstructure of the nickel alloy after laser treatment was carried out by means of scanning electron microscopy as well as atomic force microscopy. The roughness of the surface was measured by WYKO NT9300 equipment. Nanohardness test was carried out using a nanoindenter NHT 50-183 of CSM Instruments equipped with a Berkovich diamond indenter. Additionally, transmission electron microscopy was used to examine the microstructural changes on the surface layer after laser treatment. The investigations showed that the laser process produced an ablation and melting of the surface layer and, hence, increased the surface roughness of the Inconel 625. On the other hand, the presence of the slip bands on the surface and on the cross section of the treated material, a high density of dislocations and a higher hardness of the treated region indicated that the laser shock processing caused severe plastic deformation of the surface layer. Additionally, due to the high plastic deformation, cracking of the carbide precipitates was observed.

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Section: Resultssupporting

confidence: 89%

Effect of Laser Shock Peening on the Microstructure and Properties of the Inconel 625 Surface Layer

Rozmus-Górnikowska

Kusiński

Cieniek

2020

J. of Materi Eng and Perform

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“…1) [26][27][28][29]. This positive effect of LSP was shown on many different materials such as aluminum alloys [25,26,30,31] titanium alloys [28,32,33] nickel based alloys [34][35][36], stainless steel [29] etc.…”

Section: Introductionmentioning

confidence: 99%

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

Kalentics

Boillat

Peyre

et al. 2017

Additive Manufacturing

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Selective laser melting Laser shock peening 3D Laser shock peening Residual stress profile 15-5 PH stainless steel 316L stainless steel a b s t r a c t The paper describes a new approach in controlling and tailoring residual stress profile of parts made by Selective Laser Melting (SLM). SLM parts are well known for the high tensile stresses in the as -built state in the surface or subsurface region. These stresses have a detrimental effect on the mechanical properties and especially on the fatigue life. Laser Shock Peening (LSP) as a surface treatment method was applied on SLM parts and residual stress measurements with the hole -drilling method were performed. Two different grades of stainless steel were used: a martensitic 15-5 precipitation hardenable PH1 and an austenitic 316L. Different LSP parameters were used, varying laser energy, shot overlap, laser spot size and treatments with and without an ablative medium. For both materials the as-built (AB) residual stress state was changed to a more beneficial compressive state. The value and the depth of the compressive stress was analyzed and showed a clear dependence on the LSP processing parameters. Application of LSP on SLM parts showed promising results, and a novel method that would combine these two processes is proposed. The use of LSP during the building phase of SLM as a "3D LSP" method would possibly give the advantage of further increasing the depth and volume of compressive residual stresses, and selectively treating key areas of the part, thereby further increasing fatigue life.

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“…Inconel 718 is a typical Ni-based superalloy having high strength [1], excellent resistance to oxidation [2], high corrosion resistance [3,4], adequate ductility and toughness [5], favorable weldability [6] and good machining performance [7]. IN718 is used for critical parts in modern aero-engines, extrusion dies and gas-turbines [8][9][10][11][12][13][14][15][16][17]. Hot deformation is necessary to achieve the required properties in IN718.…”

Section: Introductionmentioning

confidence: 99%

Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718

Azarbarmas

Aghaie-Khafri

Cabrera

et al. 2016

Materials Science and Engineering: A

209

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The hot deformation behavior of an IN718 superalloy was studied by isothermal compression tests under the deformation temperature range of 950–1100 °C and strain rate range of 0.001–1 s-1 up to true strains of 0.05, 0.2, 0.4 and 0.7. Electron backscattered diffraction (EBSD) technique was employed to investigate systematically the effects of strain, strain rate and deformation temperature on the subgrain structures, local and cumulative misorientations and twinning phenomena. The results showed that the occurrence of dynamic recrystallization (DRX) is promoted by increasing strain and deformation temperature and decreasing strain rate. The microstructural changes showed that discontinuous dynamic recrystallization (DDRX), characterized by grain boundary bulging, is the dominant nucleation mechanism in the early stages of deformation in which DRX nucleation occurs by twining behind the bulged areas. Twin boundaries of nuclei lost their ¿3 character with further deformation. However, many simple and multiple twins can be also regenerated during the growth of grains. The results showed that continuous dynamic recrystallization (CDRX) is promoted at higher strains and large strain rates, and lower temperatures, indicating that under certain conditions both DDRX and CDRX can occur simultaneously during the hot deformation of IN718.Peer ReviewedPostprint (author's final draft

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Characteristics of surface layers formed on inconel 718 by laser shock peening with and without a protective coating

Cited by 123 publications

References 11 publications

Effect of Laser Shock Peening on the Microstructure and Properties of the Inconel 625 Surface Layer

Effect of Laser Shock Peening on the Microstructure and Properties of the Inconel 625 Surface Layer

Tailoring residual stress profile of Selective Laser Melted parts by Laser Shock Peening

Dynamic recrystallization mechanisms and twining evolution during hot deformation of Inconel 718

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