Surface Topography: Metrology and Properties最新文献

{"title":"Determination of local fractal dimension of the catalyst support MgAl2O4 surface","authors":"Z A Zakletskii, Namik Gusein-Zade, A A Sorokin","doi":"10.1088/2051-672x/ad2ebf","DOIUrl":"https://doi.org/10.1088/2051-672x/ad2ebf","url":null,"abstract":"In this paper, a procedure for estimating local fractal dimensionality values for greyscale images was developed. This procedure was tested on synthesised fractal and multifractal Brownian surfaces. The use of the method of detrended fluctuation analysis to determine the Hurst index for samples with a size not exceeding 2000 points was analysed. The optimal values of the sample size and the scale parameter have been obtained, allowing the Hurst index to be calculated with an error of less than 20%. The procedure was also tested on greyscale images, which are 8-bit representations of a synthesised fractal surface. The peculiarities of the application of the procedure for calculating the local fractal dimension for images obtained by scanning electron microscopy have been analysed. The values of the local fractal dimension of the oxide support MgAl₂O₄ are calculated using SEM images at different magnifications. It has been shown that, taking into account the fractal dimensionality calculation, different morphologies of the particle surface are observed at different scales of image magnification. At the highest magnification, the particle surface is found to consist of embedded smooth micron particles. The surface morphology of the MgAl₂O₄ particle depends on the micro- and mesopores between the embedded particles, this surface can be characterised by a fractal surface with FD₂ = 2.3–2.4.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"23 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of surface strengthening by ultrasonic shot peening on TC17 alloy","authors":"Mingxin Tan, Jin Cai, Jinglong Qu, Xingfei Xie, Shaomin Lv","doi":"10.1088/2051-672x/ad2cb4","DOIUrl":"https://doi.org/10.1088/2051-672x/ad2cb4","url":null,"abstract":"This paper investigates the effects of ultrasonic shot peening (USP) on surface morphology, microstructure, and residual stress field distribution of TC17 alloy under different process parameters. The aim is to reveal the surface strengthening mechanism of TC17 alloy caused by USP. The results suggest that the use of the 2.5 mm projectile diameter leads to an increase in surface roughness, plastic deformation, and a deeper grain refinement layer compared to the 1.5 mm projectile diameter. Additionally, it results in a greater depth of the compressive residual stress layer and maximum compressive residual stress. The crack initiation sites under two projectile diameters are located below the compressive residual stress layer. The USP treatment introduces compressive residual stress on the surface, inhibiting the initiation of surface cracks, and the deeper compressive residual stress layer offsets the early fatigue failure caused by higher roughness.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"35 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bayesian analysis of uncertainties in circle, straight-line and ellipse fitting considering a-priori knowledge − comparative analysis with total-least-squares approaches","authors":"A Keksel, B Eli, M Eifler, J Seewig","doi":"10.1088/2051-672x/ad2ba0","DOIUrl":"https://doi.org/10.1088/2051-672x/ad2ba0","url":null,"abstract":"Fitting standard geometric elements into measurement data using Least-Squares techniques is a common task in signal processing across various technical applications. However, the application of these well-established but purely data-based methods does not consider potentially available prior knowledge about the measurand of interest or the measuring device. Thus, up to this day, additional information is usually left unused beyond a few academic applications. By applying a Bayesian approach, this prior knowledge can be incorporated into the fitting task, potentially leading to a reduction in overall uncertainty and fragility of the evaluation result. In this study, Bayesian models are proposed for incorporating prior knowledge into circular, linear, and ellipse fitting tasks. The general approaches as well as specific results are compared to the established Total-Least-Squares method within the example of the application of the F-operator in surface texture measurement illustrating the practical benefits of the approach.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"13 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Precision of diamond turning sinusoidal structures as measurement standards used to assess topography fidelity","authors":"Dorothee Hüser, Rudolf Meeß, Gaoliang Dai, André Felgner, Kai Hahm, Stefan Verhülsdonk, Carsten Feist, Sai Gao","doi":"10.1088/2051-672x/ad2c33","DOIUrl":"https://doi.org/10.1088/2051-672x/ad2c33","url":null,"abstract":"In optical surface metrology, it is crucial to assess the fidelity of the topography measuring signals. One parameter to quantify this is the <italic toggle=\"yes\">small-scale fidelity limit T</italic>\u0000_FIL defined in ISO 25 178-600:2019. To determine this parameter, sinusoidal structures are generated, where the wavelengths are modulated according to a discrete chirp series. The objects are produced by means of ultra-precision diamond face turning. Planar areas and regions with slopes below 4° could be produced with form deviations of ≲10 nm. An initial estimate of the cutting tool’s nose radius resulted in a deviation that caused the ridges of the structures to be too narrow by approximately 150 nm, while the trenches were too wide. At the bottom of narrow trenches, deviations are observed in the form of elevations with heights of about 20 to 100 nm. The measurement standard investigated in this study has also been used to characterise optical instruments in a round-robin test within the European project TracOptic, which requires precise knowledge of the geometry of all structures. The geometry of the topography, cosine structures superimposed with form deviations, was measured using the Met. LR-AFM metrological long-range atomic force microscope of the German National Metrology Institute.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"47 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparison of textured nylon surfaces manufactured by CNC micromachining and 3D printing","authors":"Luis Miguel Ballesteros, David Cano, Camilo Andrés García, Laura Vanessa Giraldo, Luis Felipe Jiménez, Esteban Rave, J S Rudas, Cesar A Isaza M, Alejandro Toro","doi":"10.1088/2051-672x/ad2af3","DOIUrl":"https://doi.org/10.1088/2051-672x/ad2af3","url":null,"abstract":"Patterned surfaces can be designed and engineered to control friction and wear resistance in various applications. In the present work, a comparative analysis of two contrasting manufacturing processes for surface texturing of polyamide, namely 3D printing by fused filament fabrication (FFF) and CNC micromachining (micro CNC) as additive and subtractive manufacturing techniques respectively was carried out. The analysis included the evaluation of the topography, roughness, mechanical properties, and tribological performance of the texturized surfaces. Both manufacturing routes were suitable for fabricating deterministic surfaces, being the micro CNC method the one that provided better repeatability and surface finishing as well as higher hardness. These factors influenced the tribological behavior of the polyamide when in contact with AISI 304 stainless steel. The effects of size, distribution and height of the texture elements and the manufacturing technique on the Coefficient of Friction (COF) were also discussed.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"51 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergetic effect of oleophilic textured surfaces and MoS2 on the tribological properties of Ti-6Al-4V alloy under dry and lubricated sliding conditions","authors":"Turali Narayana, Sheikh Shahid Saleem","doi":"10.1088/2051-672x/ad237e","DOIUrl":"https://doi.org/10.1088/2051-672x/ad237e","url":null,"abstract":"In the present work, surface modification of Ti-6Al-4V alloy was carried out using Laser surface texturing (LST). The investigation aims to explore the synergetic impact of LST and molybdenum disulfide (MoS₂), as a solid lubricant, on the tribological properties of Ti-6Al-4V alloy. Three types of LST textures (Circular, triangular, and square textures) were created on the Ti6Al4V alloy. Subsequently, tribological tests were conducted on a universal tribometer (ball-on-disc), at a load of 20 N with a frequency of 15 Hz. The worn surface was analyzed using various methods, including optical microscopy, 3D-profilometer, FESEM, EDAX analysis, and Raman spectroscopy. The study compared the coefficient of friction (COF) and wear behavior of un-textured surfaces (U_TS) with those of textured surfaces (T_S) under both dry sliding conditions (D_SC) and lubricated sliding conditions (L_SC). The results demonstrated a significant reduction in the COF and wear coefficients on the T_S. Specifically, the circular texture exhibited significant results with a 10.30%, 10.42%, and 28.80% decrease in COF and a remarkable reduction of 39.22%, 47.51%, and 77.90% in wear coefficients compared to the U_TS tested under D_SC and L_SC (using PAO-4 and PAO-4 + 1% wt MoS₂). Severe abrasion, adhesion, and delamination as the primary wear mechanisms were observed on the U_TS and T_S under D_SC, while the L_SC was characterized by mild adhesive and delamination wear on the U_TS and T_S. The carbon layer formation and concentration of Mo and S particles resulted in lower friction and wear coefficients for the U_TS, and T_S under L_SC (PAO-4 + 1% wt MoS₂). The analysis indicated that the use of LST and solid lubricant nanoparticles on a Ti-6Al-4V alloy would result in improved service life and better endurance in cutting tools and tribo-mating parts.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"17 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139756917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recognition of grinding surface roughness grade based on adversarial domain adaptation under variable illumination","authors":"Huaian Yi, Jiefeng Huang, Ai-qin Shu, Kun Song","doi":"10.1088/2051-672x/ad1c71","DOIUrl":"https://doi.org/10.1088/2051-672x/ad1c71","url":null,"abstract":"\u0000 Deep learning can realize the self-extraction of grinding surface features so that end-to-end roughness measurement can be realized. Still, due to the grinding surface texture being random, the features are weak, the self-extracted grinding surface features of the same surface under different lighting environments are different, and the training data and the test data when the lighting environments are inconsistent with the recognition of the measurement of the accuracy of the lower. To address these issues, this paper proposes an adversarial domain self-adaptation (NMDANN) based visual measurement method for grinding surface roughness under variable illumination. An improved residual network is used as a generator to extract more effective metastable features, and multi-head attention is introduced into the domain discriminator to enhance its domain adaptive capability. The experimental results show that the method can recognize different grades of roughness on the grinding surface under changing light environments, laying the foundation for online visual measurement of grinding surface roughness under variable light environments.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"85 6","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of laser shock peening as a pretreatment on ion nitriding of precipitation hardened stainless steel","authors":"Avinash S, Vineeta Yadav, M. Duraiselvam","doi":"10.1088/2051-672x/ad1607","DOIUrl":"https://doi.org/10.1088/2051-672x/ad1607","url":null,"abstract":"\u0000 Laser shock peening (LSP) is emerging as an advanced technology to improve the fatigue life of engineering products. Also, this can improve wear and corrosion resistance as add-on benefits to the properties of the materials. In the present investigation, a systematic understanding of the hybrid surface treatment that combines LSP with ion nitriding, also known as plasma nitriding (PN) of precipitated hardened (PH) stainless steel was conducted to improve the effective case hardening layer. The effect of input parameters such as laser spot diameter, the number of superimposed layers, and overlap rate was investigated on the performance characteristics, which include surface morphology, microhardness, and the change in microstructure after the proposed treatment. The surface characterization results reveal that an 80% laser overlap rate modified the surface roughness of PN samples owing to higher surface roughness values induced by ablation during the LSP treatment. The microhardness and optical microscopy (OM) results revealed an increase in the effective hardening layer thickness of about 115% for a 40% overlap rate owing to the absence of blind spots. In addition, XRD analysis revealed the presence of Fe4N and CrN compounds on the surface of the PN samples. Scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) elemental mapping reveals the presence of a nitrogen-rich phase in the effective hardened layer and increased effective hardened layer thickness owing to grain refinement of LSP pre-processing.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"29 4","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138999791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation on micro ED milling of inconel alloy with SiC nano powder mixed Pongamia BD at different parametric condition","authors":"Saravana Kumar P, Arun Pillai K V","doi":"10.1088/2051-672x/ad0d79","DOIUrl":"https://doi.org/10.1088/2051-672x/ad0d79","url":null,"abstract":"<italic toggle=\"yes\">μ</italic>ED-milling is an excellent micro machining process for machining of complex micro structures on conducting materials. In this paper, the feasibility of SiC nano powder mixed Pongamia BD as a dielectric medium while <italic toggle=\"yes\">μ</italic>ED-milling of Inconel 718 alloy at different parametric settings namely capacitance (10 nf, 100 nf, 400 nf), powder concentration (0 g l⁻¹, 0.1 g l⁻¹, 0.3 g l⁻¹) and voltage (120 v, 130 v, 140 v) is analysed. Further, the craters dimensions are correlated with the 3D roughness parameters (Spk, Sk and Svk) in this investigation. Lower settings of capacitance (10 nF) offered a maximum MRR (601767.1 <italic toggle=\"yes\">μ</italic>m³ s⁻¹) compared to intermediate (398080.62 <italic toggle=\"yes\">μ</italic>m³ s⁻¹) and higher (273498.29 <italic toggle=\"yes\">μ</italic>m³ s⁻¹) settings of capacitance. MRR is increased around 1.3 times with Pongamia BD compared to SiC nano powder mixed Pongamia BD at considered parametric settings. Crater diameter is decreased by 24.1% with SiC nano powder mixed Pongamia BD due to lesser amount heat transfer to workpiece. Droplet angle of machined surface with SiC nano powder mixed Pongamia BD is 20% higher than Pongamia BD at considered parametric settings. Capacitance and voltage have the significant influence on crater diameter and roughness. Maximum MRR (1034239.41 <italic toggle=\"yes\">μ</italic>m³s⁻¹) is achieved with machining condition (10 nF, 120 V, 0 g l⁻¹) for considered biodiesels. RLT appears to be higher around 27% with the processed surface of SiC nano powder mixed Pongamia BD as compared to Pongamia BD due to reaction of powder particles with work material. 3D roughness parameters (Spk, Sk and Svk) were greatly reduced due to inclusion of powder in biodiesels. Sk (core zone) are decreased (42.8%) with 0.3 g/l SiC nano powder mixed Pongamia BD compared to Pongamia BD.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"131 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138687758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tribochemistry of mercaptoimidazoline as an additive in emulsion between self-mated GCr15 ball interfaces and its friction-reduction mechanism","authors":"Sier Kuang, Xiaoya Sun, Liping Xiong, Yinglei Wu, Lili Li, Lei Guo, zhongyi He, Renhui Zhang","doi":"10.1088/2051-672x/ad0ca0","DOIUrl":"https://doi.org/10.1088/2051-672x/ad0ca0","url":null,"abstract":"Abstract The tribological properties of two mercaptoimidazolines, with amino (2-MBTA) and hydroxyl (2-MBTD) functional groups, as lubricating additives in a water-based rapeseed oil emulsion were investigated. The results of tribological tests on a four-ball tester showed that both mercaptoimidazolines had effective anti-wear and friction reduction properties. The optimal tribological performance of the 2-MBTD was found to be 98 N and could be scribed to the hydroxyl group, whereas the amino group in 2-MBTA created a more effective wear-reducing tribofilm on the rubbing surfaces at 294 N. EDS analysis on the worn surface areas showed that the difference in tribological properties between 2-MBTA and 2-MBTD was attributed to the different contents of the active elements N and S. In addition, XPS results indicated that sulfates were prevalent in the tribofilm for 2-MBTA, whereas sulfides that could reduce the coefficient of friction (COF) were present in the tribofilm for 2-MBTD. The friction mechanism of 2-MBTA and 2-MBTD is that different functional groups influence the composition of the boundary lubrication film formed, which in turn affects the tribological properties of the additives.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"19 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134953572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}