Experimental investigation of laser peening on TiAl alloy microstructure and properties

Qiao, Hongchao; Zhao, Jibin; Gao, Yu

doi:10.1016/j.cja.2015.01.006

Cited by 44 publications

(15 citation statements)

References 24 publications

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“…al. [62], have demonstrated similar finding, whereby, microstructures were improved for marine steel, N-155 supper-alloy and TiAl respectively, and a reduction in the grains size of these metals was reported respectively. This has a similar effect to the one found in this work with the Al2O3 armour ceramics.…”

Section: Micro-structural Modifications: Grain Boundary and Morphologsupporting

confidence: 62%

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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Section: Micro-structural Modifications: Grain Boundary and Morphologsupporting

confidence: 62%

Surface engineering alumina armour ceramics with laser shock peening

Shukla

Robertson

et al. 2017

Materials & Design

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“…20,32 The microhardness, compressive residual stress, and microstructure introduced by laser peening created plastic deformation on the implant surface and has higher union capability with joining biomaterial (PMMA used in our study) than nontreated implants.…”

mentioning

confidence: 99%

Peen treatment on a titanium implant: effect of roughness, osteoblast cell functions, and bonding with bone cement

Khandaker¹,

Riahinezhad²,

Sultana³

et al. 2016

IJN

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Implant failure due to poor integration of the implant with the surrounding biomaterial is a common problem in various orthopedic and orthodontic surgeries. Implant fixation mostly depends upon the implant surface topography. Micron to nanosize circular-shaped groove architecture with adequate surface roughness can enhance the mechanical interlock and osseointegration of an implant with the host tissue and solve its poor fixation problem. Such groove architecture can be created on a titanium (Ti) alloy implant by laser peening treatment. Laser peening produces deep, residual compressive stresses in the surfaces of metal parts, delivering increased fatigue life and damage tolerance. The scientific novelty of this study is the controlled deposition of circular-shaped rough spot groove using laser peening technique and understanding the effect of the treatment techniques for improving the implant surface properties. The hypothesis of this study was that implant surface grooves created by controlled laser peen treatment can improve the mechanical and biological responses of the implant with the adjoining biomaterial. The objective of this study was to measure how the controlled laser-peened groove architecture on Ti influences its osteoblast cell functions and bonding strength with bone cement. This study determined the surface roughness and morphology of the peen-treated Ti. In addition, this study compared the osteoblast cell functions (adhesion, proliferation, and differentiation) between control and peen-treated Ti samples. Finally, this study measured the fracture strength between each kind of Ti samples and bone cement under static loading. This study found that laser peen treatment on Ti significantly changed the surface architecture of the Ti, which led to enhanced osteoblast cell adhesion and differentiation on Ti implants and fracture strength of Ti–bone cement interfaces compared with values of untreated Ti samples. Therefore, the laser peen treatment method has the potential to improve the biomechanical functions of Ti implants.

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“…It is interesting that as the power density increased to a threshold (just as 9 GW cm −2 ), the maximal residual stress is not located in the center of the laser spot where a 'residual stress hole' appeared with a diameter of 0.25 mm, as shown in figure 9(a). This might be due to the rarefaction waves generated by the boundary converged to the spot center causing a reverse plastic deformation at spot center larger than surrounding areas [35,36]. Figure 9(b) presented the results of in-depth residual stress showing that the depth with residual stress increased from ∼160 to ∼460 μm.…”

Section: Dynamic Response Of Materialsmentioning

confidence: 96%

Dynamic response and residual stress fields of Ti6Al4V alloy under shock wave induced by laser shock peening

Sun

Zhu

et al. 2017

Modelling Simul. Mater. Sci. Eng.

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Laser shock peening (LSP), an innovative surface treatment technique, generates compressive residual stress on the surface of metallic components to improve their fatigue performance, wear resistance and corrosion resistance. To illustrate the dynamic response during LSP and residual stress fields after LSP, this study conducted FEM simulations of LSP in a Ti6Al4V alloy. Results showed that when power density was 7 GW cm −2 , a plastic deformation occurred at 10 ns during LSP and increased until the shock pressure decayed below the dynamic yield strength of Ti6Al4V after 60 ns. A maximum tensile region appeared beneath the surface at around 240 ns, forming a compressive-tensile-compressive stress sandwich structure with a thickness of 98, 1020 and 606 μm for each layer. After the model became stabilized, the value of the surface residual compressive stress was 564 MPa at the laser spot center. Higher value of residual stress across the surface and thicker compressive residual stress layers were achieved by increasing laser power density,

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Experimental investigation of laser peening on TiAl alloy microstructure and properties

Cited by 44 publications

References 24 publications

Surface engineering alumina armour ceramics with laser shock peening

Surface engineering alumina armour ceramics with laser shock peening

Peen treatment on a titanium implant: effect of roughness, osteoblast cell functions, and bonding with bone cement

Dynamic response and residual stress fields of Ti6Al4V alloy under shock wave induced by laser shock peening

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