Experimental Investigation to Improve Surface Integrity of Biomedical Devices by End-Milling AISI 316L Stainless Steel

Yasir, Muhammad; Ginta, Turnad Lenggo; Alkali, Adam Umar; Danish, Mohammad

doi:10.4028/www.scientific.net/amm.789-790.141

Cited by 7 publications

(3 citation statements)

References 10 publications

(11 reference statements)

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“…Kadi [27] obtained the optimal surface roughness (Ra = 1.664 µm) during dry cutting of 316L steel. Furthermore, Yasir et al [43] achieved a value of Ra = 0.537 µm when milling AISI 316L steel. It was found that a lower surface roughness value can be obtained at lower FR values (Figure 10).…”

Section: Surface Topography Analysismentioning

confidence: 99%

Improving the Surface Integrity of 316L Steel in the Context of Bioimplant Applications

2023

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Bioimplants should meet important surface integrity criteria, with the main goal of the manufacturing process to improve wear and corrosion resistance properties. This requires a special approach at the cutting stage. During this research, the impact of the cutting parameters on improving the surface integrity of AISI 316L steel was evaluated. In this context of bioimplant applications, the mean roughness Sa value was obtained in the range of 0.73–4.19 μm. On the basis of the results obtained, a significant effect was observed of both the cutting speed and the feed rate on changes in the microstructure of the near-surface layer. At a cutting speed of 150 m/min, the average grain size was approximately 31 μm. By increasing the cutting speed to 200 m/min, the average grain size increased to approximately 52 μm. The basic austenitic microstructure of AISI 316L steel with typical precipitation of carbides on the grain boundaries was refined at the near-surface layer after the machining process. Changing the cutting speed determined the hardness of the treated and near-surface layers. The maximum value of hardness is reached at a depth of 20 μm and decreases with the depth of measurement. It was also noted that at a depth of up to 240 μm, the maximum hardness of 270–305 HV1 was reached, hence the height of the machining impact zone can be determined, which is approximately 240 μm for almost all machining conditions.

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Section: Surface Topography Analysismentioning

confidence: 99%

Improving the Surface Integrity of 316L Steel in the Context of Bioimplant Applications

2023

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“…The thermo-mechanical model is built by ABAQUS, which owns a rich data of material and element type. The detailed modelling steps are as follows: (1) First, choose Johnson-cook model as the constitutive equations, due to its simple form and accurate descriptions of material behavior in high strain rate [47]; (2) Second, use physical criterion estimate chip separation conditions for drawing close to the reality [48]; (3) Third, set tangential and normal friction models in contact property, the former is based on penalty function with friction coefficient of 0.27, the latter takes hard contact to realize separation after contact [49].…”

Section: Comparisonmentioning

confidence: 99%

Efficient prediction of milling distortion using inversely-identified inherent strains

Huang

Chen

et al. 2023

Preprint

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Predictive milling distortion has been widely used to optimize milling design and process. Inherent strains method (ISM) applies plastic strains calculated from small-scale thermo-mechanical simulations to large-scale models to assess residual deformation in less time. In this paper, ISM is proved feasible in milling process by theoretical and experimental analysis. Moreover, a novel method called inverse identification is proposed to obtain milling inherent strain efficiently. To verify the proposed method, two milling cases are presented to evaluate its accuracy in distortion prediction. In addition, comparisons with the thermo-mechanical model and traditional ISM model indicate that the inversely-identified inherent strains can significantly reduce the simulation time at the premise of similar precision, which is practical to be applied in industrial applications.

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“…At the greatest cutting speed (V c = 140 m/min), the primary zone temperature was higher in comparison with lower cutting speed; this thermal state decreased the yield strength of material, decreasing the cutting force requirement to machine the material and resulting in a smoother surface. The formation of the BUE at a higher cutting speed was reduced along with the voids which improved the surface quality [43,44]. Figure 5 shows a 2D surface profile scan of the sample with lowest and highest Z (μm) value.…”

Section: Surface Roughnessmentioning

confidence: 99%

Investigation into the surface quality and stress corrosion cracking resistance of AISI 316L stainless steel via precision end-milling operation

Yasir¹,

Danish

Mia

et al. 2020

Int J Adv Manuf Technol

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This study presents a two-fold investigation on precision end-milling of stainless steel (AISI 316L). First, the impact of end-milling variables (cutting speed and feed rate) on the surface quality (surface roughness, microhardness, and surface morphology) was analyzed. The best surface quality with surface roughness (Ra) 0.65 ± 0.02 μm was observed for cutting speed of 140 m/min and 0.025 mm/tooth of feed rate. Microhardness was increased with increment in cutting speed. Second, the impact of surface roughness (Ra) on the stress corrosion cracking under two different mediums, i.e., body solutions (Hank’s solution) and 1 M hydrochloric acid solution, was studied. The investigations showed that the samples with higher surface roughness values were more prone to stress corrosion cracking.

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Experimental Investigation to Improve Surface Integrity of Biomedical Devices by End-Milling AISI 316L Stainless Steel

Cited by 7 publications

References 10 publications

Improving the Surface Integrity of 316L Steel in the Context of Bioimplant Applications

Improving the Surface Integrity of 316L Steel in the Context of Bioimplant Applications

Efficient prediction of milling distortion using inversely-identified inherent strains

Investigation into the surface quality and stress corrosion cracking resistance of AISI 316L stainless steel via precision end-milling operation

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