Recent Assessment of Surface Integrity Resulting from Fine Finishing Processes

Klopfstein, M.J.; Lucca, D.A.

doi:10.1016/j.proeng.2011.11.103

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…According to the measured vertical retreats and corresponding surface topography, it is evident that the adopted polishing method affected the crystal structure and its reactivity to a depth of several micrometers below the surface, which is consistent with studies of near surface damage generated by mechanical polishing of various crystalline materials (Lucca et al, 2006;Klopfstein and Lucca, 2011). This fact implies that, if the same conditions are maintained, the observed surface topography and the increased retreat rates represent transient non-steady state conditions towards a smoother topography and slower rates of dissolution, which will be attained after the extent of surface retreat becomes larger than the thickness of the crystal affected by damage due to sample treatment.…”

Section: Influence Of Mechanical Polishing On Surface Topography and Measured Retreat Ratessupporting

confidence: 83%

Effects of surface orientation, fluid chemistry and mechanical polishing on the variability of dolomite dissolution rates

Saldi

Voltolini

Knauss

2017

Geochimica et Cosmochimica Acta

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Recent studies of carbonate surface reactivity have underscored the fundamental variability of dissolution rates and the heterogeneous distribution of the reaction over the mineral surface due to the inhomogeneous distribution of surface energy. Dolomite dissolution rates relative to different cleavage planes (r-planes) and surfaces cut approximately perpendicular to the c-axis (c-planes) were studied at 50 °C as a function of pH (3.4 ≤ pH ≤ 9.0) and solution composition by vertical scanning interferometry (VSI) and atomic force microscopy (AFM), with the aim of providing an estimate of the intrinsic rate variation of dolomite single crystals and describing the surface reaction distribution and the rate controlling mechanisms. Surface normal retreat rates measured under acidic conditions increased linearly with time and were not visibly affected by the parallel increase of surface roughness. Mean total dissolution rates of r-planes decreased by over 200 times from pH 3.4 to pH 9.0 and CO 3 2--rich solutions, whereas corresponding rate variations spanned over 3 orders of magnitude when also c-plane rate distributions were included in the analysis. At acid to near neutral pH, c-planes dissolved ~ three times faster than the adjoining r-planes but slower at basic pH and high total carbon concentration, displaying a distinctive morphologic evolution in these two regimes. The comparison of polished and unpolished crystals showed that polished cleavage planes dissolved about three times faster than the unpolished counterpart at near neutral to basic conditions, whereas no significant difference in reactivity was observed at pH < 5.Although experimental data and observations indicate a tendency of dolomite faces to reach a low-energy topography over the course of the reaction, the evolution of the entire crystal morphology depends also on the reactivity of edge and corner regions, whose contribution to measured rates is not generally taken into account by laboratory experiments. The study of time-

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Section: Influence Of Mechanical Polishing On Surface Topography and Measured Retreat Ratessupporting

confidence: 83%

Effects of surface orientation, fluid chemistry and mechanical polishing on the variability of dolomite dissolution rates

Saldi

Voltolini

Knauss

2017

Geochimica et Cosmochimica Acta

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“…Tensile testing and X-ray diffraction are also options to measure tensile strength and ductility and residual stresses of machined components as well. The first technique is a destructive method while the second one is generally limited to a spatial resolution of about 1 μm and by high cost of the instrumentation equipment [7]. So, techniques that combine non-destructive characteristics, rapidness, and low cost to monitor and to prevent thermal damages in engineered parts are always pursued.…”

Section: Introductionmentioning

confidence: 99%

Electromechanical impedance (EMI) technique as alternative to monitor workpiece surface damages after the grinding operation

Silva

Ferreira

Baptista

et al. 2018

Int J Adv Manuf Technol

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Electromechanical impedance (EMI) technique has been employed in detection of structural failure in civil and mechanical structures because of its non-destructive property and easy implementation of small and inexpensive piezoelectric transducers that are attached to the structures, which lead to cost reduction as well as lesser dependence of manual inspection methods. In this technique, the capsule is excited by applying a sinusoidal voltage to generate waves to propagate throughout the structure. From the impedance signature of the structure without any damage, any structural change can be detected by measuring the electrical impedance of the piezoelectric (PZT) patch. Based on its real potentiality and because of its non-destructive characteristics, this work aimed to employ the EMI technique as the first alternative to monitor workpiece surface damages after grinding operation with a conventional abrasive grinding wheel. EMI measurements were performed by using a low-cost PZT transducer and under controlled environmental conditions. Microhardness and surface roughness of the machined surfaces, as well as grinding power, were also measured to detect any damage in the machined surface and to stablish relationship with the EMI technique. From the damage indices root mean square deviation (RMSD) and correlation coefficient deviation metric (CCDM), surface alterations on the ground surfaces were inferred by the EMI method. Also, it was observed a good correlation between the EMI technique and the other output parameters that were investigated in this work, such as surface roughness and power grinding, thereby posing as a non-destructive, low-cost, and viable technique to monitor workpiece surface damages in the grinding operation.

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Microstructural and mechanical properties evolution of 690 nickel-based alloy subjected to severe hand disc grinding conditions

Youssef

Vidalenc²,

Calonne³

et al. 2022

Materials Characterization

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Recent Assessment of Surface Integrity Resulting from Fine Finishing Processes

Cited by 5 publications

References 43 publications

Effects of surface orientation, fluid chemistry and mechanical polishing on the variability of dolomite dissolution rates

Effects of surface orientation, fluid chemistry and mechanical polishing on the variability of dolomite dissolution rates

Electromechanical impedance (EMI) technique as alternative to monitor workpiece surface damages after the grinding operation

Microstructural and mechanical properties evolution of 690 nickel-based alloy subjected to severe hand disc grinding conditions

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