Surface property modifications of silicon carbide ceramic following laser shock peening

Shukla, Pratik; Nath, Subhasisa; Wang, Guanjun; Shen, Xiaojun; Lawrence, Jonathan

doi:10.1016/j.jeurceramsoc.2017.03.005

Cited by 38 publications

(19 citation statements)

References 33 publications

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“…For example, the P/c 3/2 value will be increased by 60% in the sample treated by 800 mJ laser for four LSP scans compared to the untreated sample. These results suggest that the cracking resistance of α‐Al 2 O 3 ceramics is much improved after LSP, similar to other studies on LSP‐treated SiC and α‐Al 2 O 3 ceramics . This effect may be explained by the reduction of the stress intensity factor around the indentations by the compressive residual stress generated by LSP .…”

Section: Resultssupporting

confidence: 86%

“…These results suggest that the cracking resistance of a-Al 2 O 3 ceramics is much improved after LSP, similar to other studies on LSP-treated SiC and a-Al 2 O 3 ceramics. 4,16 This effect may be explained by the reduction of the stress intensity factor around the indentations by the compressive residual stress generated by LSP. 49,50 Much literature has suggested that the presence of compressive residual stresses can inhibit the propagation of surface-originated cracks.…”

Section: Mechanical Properties After Lsp and Postannealingmentioning

confidence: 99%

“…Akita et al first applied LSP on Si 3 N 4 ceramics, which introduced a compressive residual stress of up to 500 MPa into the surface and improved the bending strength. Shukla et al applied LSP to SiC and alumina armor ceramics, which showed that tailoring LSP parameters can control the residual stress, surface roughness, hardness, and fracture resistance . Xing et al found that femtosecond (fs) laser pretreatment can improve the wear resistance of Al 2 O 3 /TiC cutting tools.…”

Section: Introductionmentioning

confidence: 99%

“…Shukla et al applied LSP to SiC and alumina armor ceramics, which showed that tailoring LSP parameters can control the residual stress, surface roughness, hardness, and fracture resistance. 12,16,17 Xing et al 18 found that femtosecond (fs) laser pretreatment can improve the wear resistance of Al 2 O 3 /TiC cutting tools. Wang et al 4 conducted LSP on a-Al 2 O 3 ceramics, which was capable of generating a compressive residual stress to a depth of 1.2 mm from the surface which improves the resistance to indentation cracking.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure‐property relation in alumina ceramics during post‐annealing process after laser shock processing

et al. 2018

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Laser shock processing (LSP) is a new surface engineering approach to introduce significant compressive residual stress into ceramics to improve their mechanical properties. However, LSP of ceramics may induce microcracks, which limit the further improvement of mechanical properties of ceramics. In this research, the effect of a post‐LSP annealing process on α‐Al2O3 ceramics was investigated. The annealing treatment can cause thermal relaxation of compressive residual stress generated by LSP while still maintain the positive attribute of LSP. The compressive residual stress was stabilized after annealing after 10 hours at 1100‐1300°C. The healing of microcracks in α‐Al2O3 ceramics was observed during the post‐LSP annealing process, which is caused by diffusion bonding mechanisms and accompanied by dislocation and void formation. The combination of the stabilized compressive residual stress and microcrack healing can improve the cracking resistance of α‐Al2O3 ceramics to mechanical impact on the surface by 69%.

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Section: Resultssupporting

confidence: 86%

Section: Mechanical Properties After Lsp and Postannealingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure‐property relation in alumina ceramics during post‐annealing process after laser shock processing

et al. 2018

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“…Nevertheless, previous work has demonstrated some improvement in certain material properties such as hardness improvement [30,42,43], fracture toughness (KIc) [44] with selected processing parameters. This research is focused on the feasibility of strengthening Al2O3 ballistic armour plates for a bulletproof vest application.…”

Section: Introductionmentioning

confidence: 99%

Surface engineering alumina armour ceramics with laser shock peening

Shukla

Robertson

et al. 2017

Materials & Design

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Citation: SHUKLA, P.P., 2017. Surface engineering alumina armour ceramics with laser shock peening. Materials and Design, 134, Additional Information:• results showed an increase in the surface hardness by 10% which was confirmed by a reduction in Vickers indentations size by 5%. The respective flaw sizes of the Vickers indentations were also reduced (10.5%) and inherently increased the KIc (12%). Residual stress state by X-ray diffraction method showed an average stress of -64 MPa after LSP, whilst the untreated surface stress measured +219 MPa. Further verification with the fluorescence method revealed surface relaxation with a maximum residual stress of -172 MPa after LSP of the Al2O3 armour ceramic. These findings are attributed to a microstructural refinement, grain size reduction and an induction of compressive stress that was relaxing the top/near surface layer from the pre-existing tensile stresses after LSP.Further process refinement/optimization will provide better control of the surface properties and will act as a strengthening technique to improve the performance of armour ceramics to stop bullets for a longer period of time and protect the end-users.

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Recent Developments and Novel Applications of Laser Shock Peening: A Review

2021

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Wear, corrosion, and fatigue are responsible for more than 80% of the failures of metallic materials. As most failures caused by wear, corrosion, and fatigue initiate from the material surface, surface integrity has a crucial impact on the overall performance of the materials. Surface integrity characteristics, including hardness, microstructure, morphology, roughness, and residual stress status, can significantly affect the wear and corrosion behavior. By improving hardness and introducing beneficial compressive residual stresses in the near-surface region, laser shock peening (LSP) can significantly improve the fatigue performance of metallic materials. In the LSP process, light from a high-energy pulsed laser penetrates through the transparent confinement media and irradiates the ablative coating, quickly heating the affected area to a high temperature and generating high-pressure plasma. The expansion of the plasma causes a shockwave that can plastically deform the target metals, resulting in work hardening and compressive residual stresses. Compared with shot peening (SP), LSP has the following advantages. 1) LSP can produce deeper layers of compressive residual stresses; 2) the process parameters in LSP can be precisely controlled; 3) the surface integrity of the parts after LSP is improved without the need for postprocessing; 4) LSP can be used to treat components with complex geometry; and 5) LSP has a high processing efficiency and makes for a clean working environment. Because LSP represents a new generation of surface strengthening technology that can replace SP, it has gained wide attention. Askar'yan and Moroz measured the pressures exerted by a high-intensity laser beam on the surface of a metal target [1] and found that this pressure is sufficient for steering space vehicles. However, the experiments were conducted under vacuum conditions to prevent dielectric breakdown, and such conditions are not practical for use in industry. [2] Anderholm at Sandia Laboratories irradiated an aluminum film covered in quartz with a laser beam and found that the presence of a transparent confinement layer can significantly increase the shock pressure. [3] Although this experiment was also conducted in vacuum, it proved that with the presence of a transparent confinement layer, a laser power density that does not cause dielectric breakdown in air can also generate a sufficiently large shock pressure. This observation is of great significance for the later industrial applications that involve laser-generated shockwaves.Fairand et al. at Battelle Memorial Institute changed the microstructure of 7075 aluminum alloy through short-pulse, laser-induced shockwaves with a high power density, and they found that after processing, the stress corrosion cracking (SCC) resistance and fatigue performance of the alloy improved. [4] This is a key event in the development of LSP; after this study, the National Science Foundation of the United States began to support the investigation of LSP. Clauer et al. [5] changed the intensity ...

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Surface property modifications of silicon carbide ceramic following laser shock peening

Cited by 38 publications

References 33 publications

Microstructure‐property relation in alumina ceramics during post‐annealing process after laser shock processing

Microstructure‐property relation in alumina ceramics during post‐annealing process after laser shock processing

Surface engineering alumina armour ceramics with laser shock peening

Recent Developments and Novel Applications of Laser Shock Peening: A Review

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