Surface engineering of ultra-hard polycrystalline structures using a nanosecond Yb fibre laser: Effect of process parameters on microstructure, hardness and surface finish

AbstractSurface roughness and heat-affected zone (HAZ) are the important features which influence the performance of the laser-drilled products. Understanding the influence of laser process parameters on these responses and identifying the cutting conditions for simultaneous optimization of these responses are a primary requirement in order to improve the laser drilling performance. Nevertheless, no such contribution has been made in the literature during laser drilling of AISI 303 material. The aim of the present work is to optimize the surface roughness (Ra) and HAZ in fibre laser drilling of AISI 303 material using Taguchi-based grey relational analysis (GRA). From the GRA methodology, the recommended optimum combination of process parameters is flushing pressure at 30 Pa, laser power at 2000 W and pulse frequency at 1500 Hz for simultaneous optimization of Ra and HAZ, respectively. From analysis of variance, the pulse frequency is identified as the most influenced process parameters on laser drilling process performance.

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Experimental investigations on finishing of a brass specimen by magneto-rheological honing technique

Journal of Micromanufacturing ◽

10.1177/25165984211015785 ◽

2021 ◽

pp. 251659842110157

Author(s):

Chinu Kumari ◽

Sanjay Kumar Chak

Keyword(s):

Magnetic Field ◽

Process Parameters ◽

Surface Finish ◽

Rotational Speed ◽

Field Application ◽

Surface Finishing ◽

Experimental Investigations ◽

Significant Parameter ◽

Magnetizing Current ◽

Magneto Rheological

Magneto-rheological abrasive honing (MRAH) is an unconventional surface finishing technique that relies on abrasives mixed with a unique finishing fluid, which changes its characteristics on magnetic field application. This process imparts nanometric-level surface finish with a significant amount of uniformity. Rotating motion of the workpiece and continuous reciprocation of the finishing fluid in the MRAH process are recognized as the major aspects for adopting this process in finishing non-magnetic materials. The finishing obtained through the MRAH process relies on the workpiece’s material properties and process parameters such as concentration of abrasives in finishing fluid, rotational speed of the workpiece, and magnetic field strength/magnetizing current. To study the efficacy of MRAH process, a parametric study was conducted by performing few experiments on a brass workpiece. Design of experiment approach was adopted to plan the experiments, and the effect of different values of magnetizing current, the concentration of abrasives, and rotational speed on the surface finish were analyzed through the application of analysis of variance (ANOVA). From ANOVA, the rotational speed was found as the most significant parameter with a contribution of 48.90% on % reduction in roughness value (%∇Ra). Around 57% of roughness reduction was obtained at the optimized value of process parameters.

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Enhancing the antibacterial performance of orthopaedic implant materials by fibre laser surface engineering

Applied Surface Science ◽

10.1016/j.apsusc.2017.01.233 ◽

2017 ◽

Vol 404 ◽

pp. 67-81 ◽

Cited By ~ 34

Author(s):

Chi-Wai Chan ◽

Louise Carson ◽

Graham C. Smith ◽

Alessio Morelli ◽

Seunghwan Lee

Keyword(s):

Surface Engineering ◽

Laser Surface ◽

Fibre Laser ◽

Orthopaedic Implant ◽

Implant Materials ◽

Antibacterial Performance ◽

Laser Surface Engineering

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Study on carbon epoxy composite surfaces machined by abrasive water jet machining

Journal of Composite Materials ◽

10.1177/0021998318807278 ◽

2018 ◽

Vol 53 (20) ◽

pp. 2909-2924 ◽

Cited By ~ 8

Author(s):

Ajit Dhanawade ◽

Shailendra Kumar

Keyword(s):

Surface Roughness ◽

Composite Material ◽

Process Parameters ◽

Surface Finish ◽

Epoxy Composite ◽

Water Jet ◽

Machining Parameters ◽

Abrasive Water Jet ◽

Abrasive Water Jet Machining ◽

Pull Out

Traditional machining of carbon epoxy composite material is difficult due to excessive tool wear, excessive stresses and heat generation, delamination, high surface waviness, etc. In the present paper, research work involved in the experimental study of abrasive water jet machining of carbon epoxy composite material is described. The aim of present work is to improve surface finish and studying defects in machined samples. Taguchi's orthogonal array approach is used to design experiments. Process parameters namely hydraulic pressure, traverse rate, stand-off distance and abrasive mass flow rate are considered for this study. Analysis of machined surfaces and kerf quality is carried out using scanning electron microscope to evaluate microscopic features. Further, the effect of machining parameters on surface roughness is investigated using analysis of variance approach. It is found that traverse rate and pressure are most significant parameters to control surface roughness. Optimization of process parameters is performed using grey relational analysis. Thereafter, confirmation tests are carried out to verify the improvement in the surface quality with optimum set of process parameters. It is found that surface finish of machined samples is improved by 10.75% with optimum levels of process parameters. Defects like delamination, fiber pull-out and abrasive embedment are also studied using SEM. It is observed that delamination and fiber pull-out are prominent in samples machined at low pressure and high traverse rate.

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Effect of process parameters on flexural strength and surface roughness in fused deposition modeling of PC-ABS material

Journal of Micromanufacturing ◽

10.1177/25165984211031115 ◽

2021 ◽

pp. 251659842110311

Author(s):

Shrikrishna Pawar ◽

Dhananjay Dolas1

Keyword(s):

Surface Roughness ◽

Flexural Strength ◽

Response Surface ◽

Layer Thickness ◽

Process Parameters ◽

Surface Finish ◽

Fused Deposition Modeling ◽

Build Orientation ◽

Fused Deposition ◽

Deposition Modeling

Fused deposition modeling (FDM) is one of the most commonly used additive manufacturing (AM) technologies, which has found application in industries to meet the challenges of design modifications without significant cost increase and time delays. Process parameters largely affect the quality characteristics of AM parts, such as mechanical strength and surface finish. This article aims to optimize the parameters for enhancing flexural strength and surface finish of FDM parts. A total of 18 test specimens of polycarbonate (PC)-ABS (acrylonitrile–butadiene–styrene) material are printed to analyze the effect of process parameters, viz. layer thickness, build orientation, and infill density on flexural strength and surface finish. Empirical models relating process parameters with responses have been developed by using response surface regression and further analyzed by analysis of variance. Main effect plots and interaction plots are drawn to study the individual and combined effect of process parameters on output variables. Response surface methodology was employed to predict the results of flexural strength 48.2910 MPa and surface roughness 3.5826 µm with an optimal setting of parameters of 0.14-mm layer thickness and 100% infill density along with horizontal build orientation. Experimental results confirm infill density and build orientation as highly significant parameters for impacting flexural strength and surface roughness, respectively.

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Optimization of Process Parameters for a Better Surface Finish of ABS Parts Prepared by Fused Deposition Modelling (FDM): A Comprehensive Review

Lecture Notes in Mechanical Engineering - Recent Trends in Engineering Design ◽

10.1007/978-981-16-1079-0_32 ◽

2021 ◽

pp. 311-320

Author(s):

Harpinder Singh Sandhu ◽

T. Rohit Raj ◽

L. Venkatasubramaniam ◽

Prateek Tiwari

Keyword(s):

Process Parameters ◽

Surface Finish ◽

Fused Deposition Modelling ◽

Comprehensive Review ◽

Fused Deposition ◽

Optimization Of Process Parameters

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Reinforcement and Cutting Tools Interaction during MMC Machining - A Review

Nano Hybrids and Composites ◽

10.4028/www.scientific.net/nhc.22.47 ◽

2018 ◽

Vol 22 ◽

pp. 47-54 ◽

Cited By ~ 1

Author(s):

Mukesh Chaudhari ◽

M. Senthil Kumar

Keyword(s):

Tool Wear ◽

Metal Matrix Composites ◽

Process Parameters ◽

Surface Finish ◽

Metal Matrix ◽

Cutting Tools ◽

Tool Geometry ◽

Matrix Composites ◽

Good Surface ◽

Aerospace Medical

Aluminum based metal matrix composites (AMMC) have found its applications in the automobile, aerospace, medical, and metal industries due to their superior mechanical properties. Fabricated Aluminum based metal matrix composites require machining to improve the surface finish and dimensional tolerance. Machining should be accomplished by good surface finish by consuming lowest energy and less tool wear. This paper reviews the machining of Aluminum based metal matrix composites to investigate the effect of process parameters such as tool geometry, tool wear, surface roughness, chip formation and also process parameters.

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