The Experts below are selected from a list of 10065 Experts worldwide ranked by ideXlab platform
Narendra B. Dahotre - One of the best experts on this subject based on the ideXlab platform.
-
Laser Surface Engineering of b4c fe nano composite coating on low carbon steel experimental coupled with computational approach
Materials & Design, 2020Co-Authors: Riyadh Salloom, Narendra B. Dahotre, Sameehan S Joshi, Srivilliputhur G. SrinivasanAbstract:Abstract Laser Surface Engineering was successfully used to engineer a nano carbide composite coating on a low carbon steel substrate. Two powder precursors of B4C and B4C+ 4 wt% Fe were utilized with different Laser powers and processing speeds. A smooth crack free coating layer was achieved with B4C+ 4 wt% Fe powder precursor. The phase evolution and microstructure characterization of the coating layer were conducted using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Microscopy observations revealed a fine dendritic microstructure consisting of α-Fe phase dendrites with nanosized B4C precipitates, while the interdendritic regions contained mainly Fe2B and Fe3C phases. The retention of B4C in the coating layer was observed only at high Laser power with high scanning speed. This is due to the lower stability of B4C with respect to Fe2B and Fe3C phases as confirmed with density functional theory based thermodynamic calculations. The hardness increased nearly seven fold for the nano-composite coating compared to the steel substrate due to evolution of high hardness ceramic phases, in addition to the refinement of the microstructure. This Laser coating has a high potential in advance Engineering applications where a thick coating layer with high hardness is required.
-
Laser patterned hydroxyapatite Surfaces on AZ31B magnesium alloy for consumable implant applications
Materialia, 2020Co-Authors: Neha Kalakuntla, Sameehan S Joshi, Niman Bhatia, Seema S. Patel, Narendra B. DahotreAbstract:Abstract Currently, materials employed for use as consumable prosthetic devices possess uncontrolled degradation via corrosive action and inferior bio-integration characteristics. A material that is biocompatible and mechanically rigid is necessary for osseointegration. In an attempt to address these issues, a novel Laser Surface Engineering approach was used to produce physically patterned hydroxyapatite coatings on the magnesium AZ31B alloy. Variations of two different Laser processing parameters, namely Laser power (800–1200 W) and Laser track separation (0.15–0.9 mm), were explored in conjunction to determine the optimal processing combination. Biocompatibility was subsequently examined via contact angle measurements and performing in-vitro immersions in simulated body fluid. The Surface characteristics, microstructure, and phase evolution of post-processed and post-immersed samples were examined using optical profilometry and scanning electron microscopy. It was confirmed that samples with hydrophilic contact angles correlated to higher degrees of biomineralization and minimal corrosion. These hydrophilic contact angles were realized in samples processed either with low Laser power and a higher degree of track overlap or with high Laser power and no Laser track overlap.
-
Laser Surface Engineering of B4C/Fe nano composite coating on low carbon steel: Experimental coupled with computational approach
Materials & Design, 2020Co-Authors: Riyadh Salloom, Narendra B. Dahotre, Sameehan S Joshi, Srivilliputhur G. SrinivasanAbstract:Abstract Laser Surface Engineering was successfully used to engineer a nano carbide composite coating on a low carbon steel substrate. Two powder precursors of B4C and B4C+ 4 wt% Fe were utilized with different Laser powers and processing speeds. A smooth crack free coating layer was achieved with B4C+ 4 wt% Fe powder precursor. The phase evolution and microstructure characterization of the coating layer were conducted using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Microscopy observations revealed a fine dendritic microstructure consisting of α-Fe phase dendrites with nanosized B4C precipitates, while the interdendritic regions contained mainly Fe2B and Fe3C phases. The retention of B4C in the coating layer was observed only at high Laser power with high scanning speed. This is due to the lower stability of B4C with respect to Fe2B and Fe3C phases as confirmed with density functional theory based thermodynamic calculations. The hardness increased nearly seven fold for the nano-composite coating compared to the steel substrate due to evolution of high hardness ceramic phases, in addition to the refinement of the microstructure. This Laser coating has a high potential in advance Engineering applications where a thick coating layer with high hardness is required.
-
Optimization of biocompatibility in a Laser Surface treated Mg-AZ31B alloy
Materials science & engineering. C Materials for biological applications, 2019Co-Authors: Sameehan S Joshi, Mangesh V. Pantawane, Narendra B. DahotreAbstract:Abstract Biodegradable bone implants can remove the need for subsequent bone-implant surgeries by controlled biomineralization and degradation. Although Mg-alloys generally possess biocompatible properties, they corrode rapidly, thereby preventing sufficient hydroxyapatite formation and biomineral growth. In an attempt to address these limitations, Laser Surface treatments were performed via the employment of a continuous wave Nd:YAG Laser on the Mg-AZ31B alloy using Laser fluences in the range of 1.06–4.24 J/mm2 (250–1000 W). The Laser-treated samples were investigated for their wettability in simulated body fluid. In vitro analyses were performed in simulated body fluid to examine corrosion and biomineralization behavior on the Laser-treated samples. Statistical optimization algorithms based on wettability data predicted an optimal Laser fluence of 3.286J/mm2 (775 W) within the range of Laser fluences used in the present study for achieving a balance between biodegradation and biomineralization. Confirmatory tests on optimized samples indicated an up to 84% grain size reduction in Laser-treated Surface regions, a several-fold increase in Mg17Al12 (β) phase volume fraction, a reasonably abundant formation of hydroxyapatite, and increased rates of biomineralization that exceeded degradation. These findings indicate the potential of Laser Surface Engineering to realize Mg-AZ31B alloy as a viable biodegradable bone implant material.
-
Laser additive synthesis of high entropy alloy coating on aluminum corrosion behavior
Materials Letters, 2015Co-Authors: Youkang Shon, Sameehan S Joshi, Shravana Katakam, Ravi Shanker Rajamure, Narendra B. DahotreAbstract:High entropy alloy coatings were synthesized on aluminum substrate by Laser Surface Engineering. Dilution from the substrate was minimized with the aid of multi layered coatings. Furthermore, higher Laser input energy during processing lead to uniform mixing amongst the components resulting in formation of evenly distributed high entropy alloy phases throughout the matrix. This resulted in enhanced corrosion resistance for the coatings in near neutral NaCl solution.
Indranil Manna - One of the best experts on this subject based on the ideXlab platform.
-
Laser Surface Engineering of titanium and its alloys for improved wear corrosion and high temperature oxidation resistance
Laser Surface Engineering#R##N#Processes and Applications, 2015Co-Authors: Dutta J Majumdar, Indranil MannaAbstract:Abstract Titanium and its alloys are candidate materials for applications in aerospace and biomedical sectors due to its high strength to weight ratio, excellent corrosion resistance, and good biocompatibility. However, inadequate wear, corrosion, and high-temperature oxidation resistance properties reduce the service life of the component made of titanium and its alloys, which may be improved by a suitable modification of Surface microstructures and/or composition. In the present contribution, the scope of application of Laser Surface melting and alloying on improvement of wear, corrosion, and high-temperature oxidation resistance of titanium and its alloys is discussed.
-
Laser Surface Engineering
Handbook of Manufacturing Engineering and Technology, 2015Co-Authors: Jyotsna Dutta Majumdar, Indranil MannaAbstract:Surface Engineering aims at tailoring the microstructure and/or composition of the near Surface region of a component for improving Surface dependent Engineering properties. Conventionally, Surface Engineering may broadly be classified into two categories: Surface modification (where the treated layer is part of the substrate) and coating (adding another layer onto the Surface). Laser as a clean source of heat may be used for modification of microstructure and/or composition of the near Surface region of the component by heating/melting or by deposition and alloying/cladding. Especially, because of its exponentially decaying energy distribution profile, Laser enjoys a prominent position for its application in Surface Engineering. Laser Surface Engineering may be classified as Surface transformation hardening, Surface melting, Laser Surface alloying, and Laser Surface cladding. In this chapter, the application of Laser for Surface modification like Laser transformation hardening, melting and homogenization of Surface microstructure, changing composition by Laser Surface alloying for improving Surface properties for structural application and Laser Surface cladding techniques will be discussed in detail. With a brief introduction to the individual technique, the principle of its operation will be discussed. Finally, the examples of application of Laser Surface Engineering will be discussed in detail.
-
Laser treatment to improve the corrosion resistance of magnesium (Mg) alloys
Corrosion Prevention of Magnesium Alloys, 2013Co-Authors: J. Dutta Majumdar, Indranil MannaAbstract:Abstract: Magnesium and its alloys are promising materials for automotive, aerospace and bio-implant applications due to low density (1.81 g/cm3), very low elastic modulus (45 GPa) and high tensile yield strength (200 MPa). However, they corrode too quickly in aggressive environments and possess poor wear resistance. Wear and corrosion are essentially Surface dependent degradation which may be improved by suitable modification of Surface microstructure and composition. Laser as a source of coherent and monochromatic radiation may be applied for tailoring the Surface microstructure and composition. In the present contribution, a detailed overview of Laser Surface Engineering of magnesium-based alloys is presented. Finally, the future scope of application of Laser Surface Engineering of magnesium-based alloys is presented with examples.
-
Laser-Assisted Fabrication of Materials - Laser-assisted fabrication of materials
Springer Series in Materials Science, 2013Co-Authors: Jyotsna Dutta Majumdar, Indranil MannaAbstract:High-power Lasers and their material processing applications.- An overview.- Laser-assisted machining of materials.- Current status and future scope of application.- Laser-assisted micro-fabrication.- Laser-assisted welding of materials.- Direct Laser cladding.- Laser Surface Engineering.- Laser-induced periodic Surface structures.- Optical monitoring in Laser processing.- Diode Laser-assisted materials processing.- Laser-assisted Surface processing for biomedical applications.
-
Compositionally graded SiC dispersed metal matrix composite coating on Al by Laser Surface Engineering
Materials Science and Engineering: A, 2006Co-Authors: J. Dutta Majumdar, B. Ramesh Chandra, Ashish Kumar Nath, Indranil MannaAbstract:Abstract The present study concerns development of a hard SiC dispersed composite layer on an Al substrate to improve its wear resistance property. A thin layer of SiC (dispersed in alcohol) is pre-deposited (thickness of 100 μm) on an Al substrate and Laser irradiated using a high power continuous wave (CW) CO 2 Laser. Irradiation of the pre-deposited Al substrate leads to melting of the substrate with a part of the pre-deposited SiC layer, intermixing and rapid solidification to form the composite layer on the Surface. Following Laser irradiation, a detailed characterization of the composite layer is undertaken in terms of microstructure, composition and phases. Mechanical properties like microhardness and wear resistance are evaluated in detail. The microstructure of the composite layer consists of a dispersion of partially melted SiC particles in a grain refined Al matrix. SiC particles are partly dissociated into silicon and carbon leading to formation of a low volume fraction of Al 4 C 3 phase and free Si redistributed in the Al matrix. The volume fraction of SiC is maximum at the Surface and decreases with depth. The microhardness of the Surface is improved by two to three times as compared to that of the as-received Al. A significant improvement in wear resistance in the composite Surfaced Al is observed as compared to the as-received Al. The pitting corrosion property (in a 3.56 wt.% NaCl solution) is marginally deteriorated by Laser composite surfacing.
T.n. Baker - One of the best experts on this subject based on the ideXlab platform.
-
Laser Surface modification of Ti alloys
2010Co-Authors: T.n. BakerAbstract:The Laser Surface Engineering of titanium alloys has been developed over the past 30 years to produce a modified layer up to 1mm depth, thicker than alternative techniques. CW C02 Lasers have been the main Lasers used for both Surface cladding and alloying. Much of the early work was based on Laser nitriding forming titanium nitrides throughout the molten pool. Subsequent alloying developments have included the incorporation of carbides, nitrides, oxides and silicides, and also intermetallics and rare earths, added as powders. Laser processing can now tailor Surfaces with superior tribological and erosion resistant properties compared to the untreated titanium alloys.
-
Laser Surface modification of titanium alloys
Surface Engineering of Light Alloys, 2010Co-Authors: T.n. BakerAbstract:Abstract: The Laser Surface Engineering of titanium alloys has been developed over the past thirty years to produce a modified layer up to 1 mm in depth, thicker than alternative techniques. Continuous wave CO2 Lasers have been the main Lasers used for both Surface cladding and alloying. Much of the early work was based on Laser nitriding forming titanium nitrides throughout the molten pool. Subsequent alloying developments have included the incorporation of carbides, nitrides, oxides and silicides; and also intermetallics and rare earths, added as powders. Laser processing can now tailor Surfaces with superior tribological and erosion resistant properties, compared with the untreated titanium alloys.
-
XRD and XPS studies of Surface MMC layers developed by Laser alloying Ti-6Al-4V using a combination of a dilute nitrogen environment and SiC powder
Surface & Coatings Technology, 2006Co-Authors: M.s. Selamat, L.m. Watson, T.n. BakerAbstract:Abstract Using a continuous-wave CO 2 Laser, Surface Engineering of a Ti–6Al–4V alloy through a combined treatment of Laser nitriding and SiC preplacement was undertaken. Under spinning Laser beam conditions, a Surface alloyed/metal matrix composite (MMC) layer over 300 μm in depth and 24 mm wide was produced in the alloy by the overlapping of 12 tracks. Microstructural and chemical changes were studied as a function of (a) depth in the Laser formed composite layer and (b) of the track position. Using X-ray diffraction (XRD) and X-ray photospectrographic (XPS) techniques, it was shown that the composite layer contained a complex microstructure which changed with depth. At the Surface, a non-stoichiometric, cubic TiN x solid solution ( possibly a carbonitride) containing C and Si, where x ≈ 0.65–0.8, was prominent, but was replaced by α′-Ti with increasing depth to 300 μm. TiC phase was also identified, and the presence of TiN 0.3 and Ti 5 Si 3 phases considered a distinct possibility.
-
XRD and XPS studies of Surface MMC layers developed by Laser alloying Ti–6Al–4V using a combination of a dilute nitrogen environment and SiC powder
Surface and Coatings Technology, 2006Co-Authors: M.s. Selamat, L.m. Watson, T.n. BakerAbstract:Using a continuous-wave CO2 Laser, Surface Engineering of a Ti-6Al-4V alloy through a combined treatment of Laser nitriding and SiC preplacement was undertaken. Under spinning Laser beam conditions, a Surface alloyed / metal matrix composite (MMC) layer over 300μm in depth and 24mm wide was produced in the alloy by the overlapping of 12 tracks. Microstructural and chemical changes were studied as a function of (a) depth in the Laser formed composite layer and (b) of the track position. Using X- ray diffraction (XRD) and X-ray photospectrographic (XPS) techniques, it was shown that the composite layer contained a complex microstructure which changed with depth. At the Surface, a non-stoichiometric, cubic TiNx solid solution ( possibly a carbonitride) containing C and Si , where x ≈ 0.65-0.8, was prominent, but was replaced by α′-Ti with increasing depth to 300μm. TiC phase was also identified, and the presence of TiN0.3 and Ti5Si3 phases considered a distinct possibility.
Sameer R. Paital - One of the best experts on this subject based on the ideXlab platform.
-
synthesis of tib2 tic fe nano composite coating by Laser Surface Engineering
Optics and Laser Technology, 2013Co-Authors: Sameer R. Paital, Narendra B. DahotreAbstract:Abstract The study explores the synthesis of TiB2 and TiC reinforced Fe-based nano-composite coating by Laser Surface Engineering using Ti, B4C and Fe powder mixture as precursor. The effect of Laser scanning speed on the size, morphology, and amount of nano-sized ceramic reinforcements were studied at Laser fluence of 1111 J/cm2, 1667 J/cm2 and 3333 J/cm2 respectively. A bimodal microstructure with TiC and TiB2 particles dispersed in fine α-Fe matrix was evolved in the Laser processed coatings. Besides, the nature of formation of nano-sized ceramic phase was examined. The Laser synthesized nano-composite coating yielded 3–5 times increase in microhardness. It appears that the presence of nano-sized TiB2 and TiC particles coupled with the highly refined α-Fe matrix improves the hardness significantly. This coating offers the potential to increase the hardness and toughness simultaneously for developing wear-resistance coatings.
-
Synthesis of TiB2–TiC/Fe nano-composite coating by Laser Surface Engineering
Optics & Laser Technology, 2013Co-Authors: Sameer R. Paital, Narendra B. DahotreAbstract:Abstract The study explores the synthesis of TiB2 and TiC reinforced Fe-based nano-composite coating by Laser Surface Engineering using Ti, B4C and Fe powder mixture as precursor. The effect of Laser scanning speed on the size, morphology, and amount of nano-sized ceramic reinforcements were studied at Laser fluence of 1111 J/cm2, 1667 J/cm2 and 3333 J/cm2 respectively. A bimodal microstructure with TiC and TiB2 particles dispersed in fine α-Fe matrix was evolved in the Laser processed coatings. Besides, the nature of formation of nano-sized ceramic phase was examined. The Laser synthesized nano-composite coating yielded 3–5 times increase in microhardness. It appears that the presence of nano-sized TiB2 and TiC particles coupled with the highly refined α-Fe matrix improves the hardness significantly. This coating offers the potential to increase the hardness and toughness simultaneously for developing wear-resistance coatings.
-
Phase constituents and microstructure of Laser synthesized TiB2-TiC reinforced composite coating on steel
Scripta Materialia, 2008Co-Authors: Sameer R. Paital, Narendra B. DahotreAbstract:The synthesis of hard composite coating reinforced with TiB2–TiC on steel using Laser Surface Engineering has been investigated. Phase evolution was analyzed by correlating the experimental results with thermodynamic calculation performed by ThermalcalcTM software. The composite coating consists of α-Fe, γ-(Fe,Ni), TiB2, TiC and Fe3(B,C). Microstructure characterization reveals micro-sized blocky particles and submicron-sized spherical particles. Compared with the steel substrate, an improvement of microhardness value (3–4 times) was observed for the composite coating.
Arvind Agarwal - One of the best experts on this subject based on the ideXlab platform.
-
Recent Developments in Surface Engineering of Materials
JOM, 2013Co-Authors: Sandip P. Harimkar, Srinivasa R Bakshi, Arvind AgarwalAbstract:Engineering approaches to improve Surface properties such as Surface finish/appearance, hardness/strength, wear resistance, corrosion resistance, environment resistance, and heat resistance have been known since prehistoric times. The manufacturing of several ancient objects can often be traced to processes like Surface painting (use of natural pigments), machining (use of sandstone, bone, and metal tools), and heat treatments (use of soybean grains for carbonitriding of steel). While most of the modern Surface Engineering approaches have evolved from these processes, the past century has also witnessed rapid development of newer processes based on electroplating, thermal spraying, directed beam (ion, Laser, and electron) processing, and cold spraying. These processes are now utilized for depositing a range of nanostructured, amorphous, or composite materials for multiple functionalities (hardness/wear resistance, strength/ toughness, corrosion resistance, heat/environment resistance, biocompatibility and cell adhesion, and hydrophobicity). Surface Engineering is a very active area, introducing regular developments on various fronts, including fundamental research, technology development, and extension in newer applications. Some of these developments were captured at the symposium Advances in Surface Engineering: Alloyed and Composite Coatings II at the TMS 2013 Annual Meeting (San Antonio, TX; March 3–7, 2013). This symposium was sponsored by the Surface Engineering Committee of the TMS Materials Processing & Manufacturing Division (MPMD) and was partially funded by the U.S. Office of Naval Research (ONR). The symposium featured 59 presentations including 14 invited talks and several student presentations. This was a well-attended, hugely successful symposium, with discussions resulting in an important direction for the future activities of the committee. Most of the recent Surface Engineering developments discussed in the TMS 2013 symposium are highlighted in the articles published in this JOM issue. These articles represent the current state-ofthe-art and indicate emerging areas in Surface Engineering. In ‘‘Advances in Laser Surface Engineering: Tackling the Cracking Problem in Laser Deposited Ni-Cr-B-Si-C Alloys,’’ I. Hemmati et al. examine the idea of microstructural refinement for reducing the cracking tendency of Ni-Cr-B-Si-C alloys deposited by Laser cladding. This work indicates that effective toughening of these alloys could not be reached solely by refinement of the hard precipitates and that the modification of the eutectic structure or disruption of its continuous network is needed. In ‘‘Nanomechanical Properties and Thermal Conductivity Estimation of Plasma Sprayed Solid Oxide Fuel Cell Components: Ceria Doped Yttria Stabilized Zirconia Electrolyte,’’ N. Mahato et al. demonstrated layered fabrication of solid oxide fuel cell (SOFC) components using an atmospheric plasma spraying method. The nanomechanical behavior of the deposited SOFC composite layers is evaluated. In ‘‘Characterization of Nanostructured and Ultrafine Grain Aluminum-Silicon Claddings using the Nano-Impact Indentation Technique,’’ J. Arreguin-Zavala et al. report that dynamic hardness of the material becomes independent of load using a nano-impact indentation technique. Their analysis shows that better correlation can be established between dry sliding wear and dynamic hardness. In ‘‘Abnormal Nitride Morphologies upon Nitriding Iron-Based Substrates,’’ Sai Ramudi Meka and Eric Jan Mittemeijer provide an overview of different nitride morphologies formed upon Sandip P. Harimkar, Chair of the Surface Engineering Committee of the TMS Materials Processing & Manufacturing Division (MPMD); Srinivasa Rao Bakshi, Vice Chair of the Surface Engineering Committee of TMS; and Arvind Agarwal are the JOM advisors for the Surface Engineering Committee. JOM, Vol. 65, No. 6, 2013
-
Molecular modeling of metastable FeB49 phase evolution in Laser Surface engineered coating
Journal of Applied Physics, 2006Co-Authors: Kantesh Balani, Arvind Agarwal, Narendra B. DahotreAbstract:Interstitial iron-boride phases have been a subject of research interest for a long time owing to their useful properties. Metastable FeB49 phase evolved during nonequilibrium Laser Surface Engineering was investigated along with FeB, Fe2B, and Fe3B phases. Theoretical x-ray diffraction spectrum derived from numerically constructed FeB49 crystal matched with the experimental diffraction pattern from Laser Surface engineered boride coating on the steel substrate. Furthermore, employment of ab initio SIESTA 1.3 molecular modeling for computation of total crystal energy elucidated instability of the FeB49 phase. The generation of thermodynamically nonequilibrium phase FeB49 along with Fe3B phase was further confirmed by selected area diffraction and high-resolution transmission electron microscopy analyses.
-
comparative wear in titanium diboride coatings on steel using high energy density processes
Wear, 2000Co-Authors: Arvind Agarwal, Narendra B. DahotreAbstract:Abstract A comparison between the tribological properties of titanium diboride (TiB 2 ) deposited using high energy density processes such as Pulse Electrode Surfacing (PES) and Laser Surface Engineering (LSE) has been made. The wear resistance of TiB 2 coated Surface is higher than AISI 1010 steel. The wear resistance of the LSE coated TiB 2 coating is even better than that of the PES deposited TiB 2 coating. Coefficient of friction values for LSE coated TiB 2 coating ( μ =0.6) are lower than PES deposited TiB 2 coating ( μ =0.7). Wear occurs in PES deposited TiB 2 coating by brittle fracture and attrition type mechanisms whereas mixed adhesive–abrasive wear in LSE deposited TiB 2 coating occurs by localized plastic deformation of the soft matrix phase Fe from a “composite” layer on the Surface.
-
Mechanical properties of Laser-deposited composite boride coating using nanoindentation
Metallurgical and Materials Transactions A, 2000Co-Authors: Arvind Agarwal, Narendra B. DahotreAbstract:Nanoindentation proves to be an effective technique to measure mechanical properties of “composite” materials, as it has high spatial resolution that enables estimation of properties even from fine grains, particles, and precipitates. The elastic modulus, E , of the composite boride coating deposited on AISI 1010 steel using the Laser Surface Engineering (LSE) process has been computed using the nanoindentation technique. The highest E value of 477.3 GPa was achieved for coating in a sample that contained 0.69 volume fraction of TiB_2 particles in the coating after processing with the highest Laser traverse speed of 33 mm/s. A comparison between the theoretical and experimental computation of the elastic modulus suggests that theoretical elastic modulus values are lower than computed elastic modulus, as the latter includes the effect of dissolution of fine TiB_2 particles in Fe matrix and metastable phase formation such as Fe_ a B_ b and Ti_ m B_ n . Dissolution of fine TiB_2 particles in the Fe matrix in the coating region has been corroborated by transmission electron microscope (TEM) micrographs and corresponding energy-dispersive spectroscope (EDS) analysis and selected area diffraction (SAD) pattern.
-
Laser Surface engineered TiC coating on 6061 Al alloy: Microstructure and wear
Applied Surface Science, 2000Co-Authors: Lalitha R. Katipelli, Arvind Agarwal, Narendra B. DahotreAbstract:Hard and refractory TiC has been deposited on 6061 Al alloy by Laser Surface Engineering (LSE). A `composite' coating is obtained with TiC particles of various shapes and sizes embedded in Al alloy-Ti matrix. The coating is uniform, continuous and free of cracks. The various reactions occurring during Laser processing were thermodynamically analyzed and related to the experimental observations. Microhardness measurements suggested high hardness values in the coating region and a strong bonding at the coating/substrate interface. Dry sliding wear tests were performed to measure the wear resistance and the coefficient of friction of the coating. Wear resistance of the coated Surface was found to be high when compared to the substrate side. The coefficient of friction was found to be 0.64.
