The Fracture Microphology of the Ceramics by Strong Laser Shock Processing

Zhang, Ling Feng; Zhang, Yong Kang; Feng, Aixin

doi:10.4028/www.scientific.net/msf.532-533.137

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Recent studies [21][22][23] have shown that moderate levels of plastic deformation may have been induced in ceramics (under specific conditions) [24][25][26], leading to better tensile behaviour and enhanced mechanical properties (KIC and hardness) [16,27]. Other studies [28,29] confirmed the observation crack length under Vickers micro hardness indentation response, and corresponding reduction after LSP confirming the increase in ductility caused by the introduction of residual stress within the ceramics.…”

Section: Introductionmentioning

confidence: 70%

Biocompatibility and Surface Integrity of Zirconia Ceramics Treated by Laser-plasma Driven Shock-waves

Shukla¹,

Zhang²,

Shen³

et al. 2022

Recent Prog Mater

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This is a multi-disciplinary paper focused on the preliminary results of deploying laser shock treatment (LST) to ZrO2 ceramics. This work has significance in several industrial sectors for components that will benefit from strengthening. These components are, namely: dental implants; cutting and drawing tools; valves, bearings, pressure vessels, heat exchangers and high-performance scissors and knives, where modification of hard, brittle materials properties such as that of a ZrO2, can yield a performance boost. To elucidate the influence of LST on ZrO2 ceramics, an Nd: YAG laser was used, exhibiting (operating at discrete) laser energies of 17 mJ, 85 mJ and 170 mJ, a 2 mm spot size, a pulse repetition rate of 5 Hz and pulse duration of 10 ns was deployed at 532 nm wavelength. Investigation of ZrO2 ceramic surface integrity revealed a transition from a crack-free topology to a surface dominated by fractures, as the laser energy increased from 85 mJ to 170 mJ. Residual stresses obtained by incremental hole drilling (IHD) were measured to be tensile in the upper layer and the sub-surface layer. However, compression of -595 MPa was found in the sub-surface of the ZrO2 ceramic to a depth of 350 µm after LST, particularly in the transverse direction. Biological analysis metabolic activity measurements, indicated a rise in activity for all samples as the contact time increased (24 h, 3 d and 7 d). The as-received surface revealed a more limited change in metabolism, retaining similar biochemical levels during the first 3 days followed by a slight increase after a week of cultivation, bringing about significant increase in activity in all LST surfaces, relative to the as-received condition. This suggested that a ZrO2 LST exhibited enhanced cell response, particularly, after 7 days of contact-time. The overall outcome of this introductory paper, not only showed that ZrO2 ceramics, can be laser shock treated/peened, to induce some possible beneficial mechanical and physical effects, microstructural and surface topography changes, but also showed that LST can facilitate improvement in cell response to the ZrO2 ceramic. This opens-up, new prospects for treatment of ZrO2 based ceramics for biological applications such as tooth implant screws, where avoiding fractures from mechanical loading, strength enhancement, as well as biocompatibility are all important.

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Section: Introductionmentioning

confidence: 70%

Biocompatibility and Surface Integrity of Zirconia Ceramics Treated by Laser-plasma Driven Shock-waves

Shukla¹,

Zhang²,

Shen³

et al. 2022

Recent Prog Mater

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“…Zhang et al 68 investigated the laser shocking of Al 2 O 3 ceramics and studied the fracture morphology that formed from intense laser shock processing. It was found that brittle fractures occurred at laser pulse energy of 42 J.…”

Section: State-of-the-art In Mechanical Shot Peening and Laser Shock Peeningmentioning

confidence: 99%

Laser shock peening and mechanical shot peening processes applicable for the surface treatment of technical grade ceramics: A review

Shukla

Swanson

Page

2013

Proceedings of the Institution of Mechanical Engineers, Part B:

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Laser shock peening and conventional mechanical shot peening are both comparable processes generally applicable to surface treat various metals and alloys. Commercial advantages offered by the laser systems such as flexibility, deep penetration of laser-induced shocks with precise control of the thermal pulses, shorter process times, high speeds, accuracy and aesthetics are attractive in comparison with the mechanical shot peening technique. Laser shock peening in the recent years has proved to be successful with steels, aluminium and titanium surfaces and metallic alloys in general. Nevertheless, minimal research has been conducted on laser shock peening and mechanical shot peening of technical grade ceramics. This article presents an update of the theory and to-date relevant literature within the two subject areas, as well as a comparison and a contrast between the mechanical and laser shock peening techniques. In addition, various gaps in knowledge are identified to propose further research for the development of both the techniques applicable to the surface treatment of technical grade ceramics.

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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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The Fracture Microphology of the Ceramics by Strong Laser Shock Processing

Cited by 3 publications

References 4 publications

Biocompatibility and Surface Integrity of Zirconia Ceramics Treated by Laser-plasma Driven Shock-waves

Biocompatibility and Surface Integrity of Zirconia Ceramics Treated by Laser-plasma Driven Shock-waves

Laser shock peening and mechanical shot peening processes applicable for the surface treatment of technical grade ceramics: A review

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

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