The influence of nanostructured features on bacterial adhesion and bone cell functions on severely shot peened 316L stainless steel

Bagherifard, Sara; Hickey, Daniel; Luca, Alba C. de; Malheiro, Vera; Markaki, Athina E.; Guagliano, Mario; Webster, Thomas J.

doi:10.1016/j.biomaterials.2015.09.019

Cited by 214 publications

(145 citation statements)

References 35 publications

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“…In the aircraft industry it is also used to form metal panels, called peen forming [2]. In the medical implant industry it is not only used to increase fatigue and fretting fatigue resistance but also to increase the physiological acceptance by adjusting the surface roughness [3,4]. Other areas are inhibiting stress corrosion cracking; close pores in castings to prevent leaking; create surface roughness that improve adhesion of paint; adjust surface profile for enhanced oil retention of seals [5]; creating surface topologies that improve fatigue life of tools, gears and cams [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Nordin

Alfredsson

2017

Exp Tech

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Shot peening is a manufacturing process commonly used to increase fatigue life in components for the automotive and aircraft industry. In this paper the effect of shot peening is described for a case hardened gear steel. For gears there are three main factors from shot peening that influence fatigue life: residual stresses, microstructure and surface roughness. The paper describes an experimental series where these parameters were measured for common industrial shot peening settings. The aim was to show how several different measurement techniques and results correspond to each other for certain shot peening parameters. The aim was also to gather experimental results that can be used for verification of shot peening simulations. To simplify measurements and decrease variation, flat steel plates were used as targets. Residual stress, full width at half maximum (FWHM), retained austenite, surface roughness/topology, hardness and Barkhausen noise were measured and related to microstructural changes. The mean indentation diameter was measured for individual shots at low coverage of each intensity which was used to determine the average velocity of the media. The mean diameter and hardness of the shot peening media was also determined.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Nordin

Alfredsson

2017

Exp Tech

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“…By means of shot peening [8], a gradient nanocrystalline structure with the grain size ranging from the nanometer scale to the micrometer scale was obtained in the bulk coarse-grained TC4 alloy. Bagherifard et al [9,10] used severe shot peening (SSP) to process 316L stainless steel. Their results indicated that SSP transformed the austenite phase into a strain-induced α -martensite in a layered deformation band structure and induced near surface grain refinement to the nano and sub-micron range.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystallization in the Duplex Ti-6Al-4V Alloy Processed by Multiple Laser Shock Peening

Zhou

Ren

Liu

et al. 2016

Metals

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Laser shock peening of titanium alloys has been widely applied in the aerospace industry. However, little is known of the nanocrystalline formation characteristics and mechanisms. In this investigation, a nanocrystalline layer was formed in the duplex Ti-6Al-4V titanium alloy surface region by means of multiple pulsed laser shock peening (LSP). The phase transition and residual stress characteristics of LSP samples were analyzed with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Transmission electron microscopy (TEM) was used to characterize the microstructure and morphologies. As the number of laser pulses increased for each location, higher grain refinement was observed. Micro-hardness testing showed that hardness increased with the number of pulses delivered to each location due to the formation of nanocrystalline layers and high dislocation density in the samples, and a gradient variation of the micro-hardness was obtained. In addition, mechanical twins and different dislocation configurations were formed in the α phase region while only dense dislocation tangles were observed in the β phase region after multiple laser pulse impacts.

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“…Grain re nement is thought to be an important role in the cytocompatibility of substrate [2][3][4][5][6][7][8][9] , such as cell attachment. It was reported that improved cell attachment was observed by a nano-grained Ti-29Nb-13Ta-4.6Zr alloy, on which osteoblast displayed larger number of lopodia protrusions compared with alloy without grain re nement 2) .…”

Section: Introductionmentioning

confidence: 99%

Cytocompatibility of Ti–6Al–7Nb through High-Pressure Torsion Processing

et al. 2016

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In this study, we evaluated the cytocompatibility of high-pressure torsion (HPT)-processed Ti-6Al-7Nb alloys. Grain size of titanium (Ti) alloys decreased from 5 µm (without HPT processing, HPT-0) to 100 nm (at 2 GPa, HPT-2) or 70 nm (at 6 GPa, HPT-6) through HPT processing. Cell adhesion, proliferation, and differentiation were evaluated with mouse preosteoblast (MC3T3-E1). A locomotion trend was presented by cells cultured on HPT-2 to compare with other specimens, while, an immobilization trend was presented by cells cultured on HPT-6 to compare with other specimens. Akp2 (alkaline phosphatase 2) expression was higher in cells cultured on HPT-2 than that on HPT-0 and HPT-6, indicating enhanced osteogenic differentiation. Our results demonstrate that HPT-processed Ti-6Al-7Nb alloys offer good cytocompatibility.

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The influence of nanostructured features on bacterial adhesion and bone cell functions on severely shot peened 316L stainless steel

Cited by 214 publications

References 35 publications

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Experimental Investigation of Shot Peening on Case Hardened SS2506 Gear Steel

Nanocrystallization in the Duplex Ti-6Al-4V Alloy Processed by Multiple Laser Shock Peening

Cytocompatibility of Ti–6Al–7Nb through High-Pressure Torsion Processing

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