The Experts below are selected from a list of 2265 Experts worldwide ranked by ideXlab platform
Amir Khajepour - One of the best experts on this subject based on the ideXlab platform.
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Development of Metal Matrix Composite Coating Using Laser Cladding Process
2012Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:Laser Cladding by powder injection has received significant attention in recent years due to its unique features and capabilities in various industries involved in metallic coating, prototyping, and low-volume manufacturing. Further development of this technique depends on enhancement of understanding the variables that affect the quality (in terms of bonding and being crack free), morphology and microstructure of the clad. This book contains chapters on composite coating development using Laser Cladding Process. Developed coating shows superior mechanical and tribological properties along with minimum risk of crack formation by optimized Process parameters and control over melt pool composition. Moreover, this book gives a complete understanding of in-situ deposition of Fe-Ti-C system for researchers and engineers.
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Effect of C:Ti atomic ratio on TiC morphology deposited by Laser Cladding Process
International Congress on Applications of Lasers & Electro-Optics, 2011Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:In this paper, the effect of powder composition on TiC morphology and clad hardness using in-situ Laser Cladding Process has been studied. Two atomic ratios, 45% and 55%, were selected for C:Ti, the first one of which has the potential to form TiC without formation of the preliminary Ti (α) phase. Fe percentages were 70. Results show that chemical composition affects the TiC morphology, TiC distribution and hardness profile in the clad. By increasing the C:Ti ratio from 45 at% to 55 at%, it is shown that the volume fraction of the formed TiC increases. A higher volume fraction of TiC in the clad results in higher values of reinforcements in the clad, thus increasing the clad hardness. SEM and EDS analyses have been used to characterize the phases in the clad.In this paper, the effect of powder composition on TiC morphology and clad hardness using in-situ Laser Cladding Process has been studied. Two atomic ratios, 45% and 55%, were selected for C:Ti, the first one of which has the potential to form TiC without formation of the preliminary Ti (α) phase. Fe percentages were 70. Results show that chemical composition affects the TiC morphology, TiC distribution and hardness profile in the clad. By increasing the C:Ti ratio from 45 at% to 55 at%, it is shown that the volume fraction of the formed TiC increases. A higher volume fraction of TiC in the clad results in higher values of reinforcements in the clad, thus increasing the clad hardness. SEM and EDS analyses have been used to characterize the phases in the clad.
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effect of Laser Cladding Process parameters on clad quality and in situ formed microstructure of fe tic composite coatings
Surface & Coatings Technology, 2010Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:Abstract Over the past decade, researchers have demonstrated interest in tribology and prototyping by the Laser Cladding Process. In-situ Laser Cladding enables the formation of a uniform clad by melting the powder to form desired composition from pure powder component. In this research pure Ti, graphite, and Fe with max particle sizes of 40 μm (0.04 mm) are used for in-situ Laser Cladding on a steel substrate. The effects of Laser parameters on the quality of an in-situ formed TiC–Fe based composite clad are investigated. Laser parameters have an important role in clad quality and crack formation. They affect the bonding between clad/substrate and cooling rate. Diverse microstructures have been detected in the clad. Finally a model is developed in order to explain the formation and morphology of TiC. The melting and solidification stages of TiC formation and matrix confirm the suggested model. TiC particles increase the clad hardness to an average of four times greater than substrate's hardness. Experimental methods such as, XRD and SEM are used for phases characterization.
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effect of Laser Cladding Process parameters on clad quality and in situ formed microstructure of fe tic composite coatings
Surface & Coatings Technology, 2010Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:Abstract Over the past decade, researchers have demonstrated interest in tribology and prototyping by the Laser Cladding Process. In-situ Laser Cladding enables the formation of a uniform clad by melting the powder to form desired composition from pure powder component. In this research pure Ti, graphite, and Fe with max particle sizes of 40 μm (0.04 mm) are used for in-situ Laser Cladding on a steel substrate. The effects of Laser parameters on the quality of an in-situ formed TiC–Fe based composite clad are investigated. Laser parameters have an important role in clad quality and crack formation. They affect the bonding between clad/substrate and cooling rate. Diverse microstructures have been detected in the clad. Finally a model is developed in order to explain the formation and morphology of TiC. The melting and solidification stages of TiC formation and matrix confirm the suggested model. TiC particles increase the clad hardness to an average of four times greater than substrate's hardness. Experimental methods such as, XRD and SEM are used for phases characterization.
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Development of an adaptive fuzzy logic-based inverse dynamic model for Laser Cladding Process
Engineering Applications of Artificial Intelligence, 2010Co-Authors: Meysar Zeinali, Amir KhajepourAbstract:The precision, performance, and robustness of model-based controllers depend, to a large extent, on the accuracy of the inverse dynamic model which is incorporated in the design of the controller. Due to complex nature of the Laser Cladding Process and presence of time-varying uncertainties, derivation of an accurate mathematical inverse dynamic model of the Process is very difficult, and involves many unknown parameters. The inverse dynamic model of the complex nonlinear Laser Cladding Process, which is difficult to be described mathematically, can be described by a fuzzy logic-based inverse dynamic model constructed form input-output data. In this paper, the development of an adaptive fuzzy inverse dynamic model of the Laser Cladding Process, using a systematic fuzzy modelling approach is presented. In a closed-loop Laser Cladding Process, the scanning speed of the substrate is required to produce a clad with desired geometry and quality. In this paper, a fuzzy inverse dynamic model that describes the scanning speed as a function of the Cladding parameters in particular the clad height is developed. The developed fuzzy model is validated by comparing the model output with experimental data. The results are very promising and show that fuzzy models can accurately describe the Process dynamics.
Feng Yang - One of the best experts on this subject based on the ideXlab platform.
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influence of Laser Cladding Process on the magnetic properties of wc fenicr metal matrix composite coatings
Journal of Materials Processing Technology, 2012Co-Authors: Jiaoxi Yang, Falan Liu, Xuanhe Miao, Feng YangAbstract:Abstract Metal–matrix composite (MMC) coatings were deposited by Laser Cladding technique with direct injection of WC–FeNiCr powder onto N1310 nonmagnetic steel matrix. Laser Cladding was conducted using a Trumpf6000 CO 2 Laser. The morphology of WC–FeNiCr MMC coatings was characterized using scanning electron microscopy (SEM). Magnetic properties of WC–FeNiCr MMC coatings were examined by vibrating sample magnetometer (VSM) at room temperature. The influence of Laser Cladding Process on the magnetic properties of coatings was investigated. It was found that the content of tungsten carbide and Laser power have significant effect on the magnetic properties of composite coatings. The evolution of phase constitution at different Laser power was identified by X-ray diffraction (XRD). The presence of an austenitic γ-(Fe, Ni), Cr 0.19 Fe 0.7 Ni 0.11 , Fe 3 W 3 C, WC and W 2 C phases were confirmed by the XRD analysis in the Laser clad layer.
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Influence of Laser Cladding Process on the magnetic properties of WC–FeNiCr metal–matrix composite coatings
Journal of Materials Processing Technology, 2012Co-Authors: Jiaoxi Yang, Falan Liu, Xuanhe Miao, Feng YangAbstract:Abstract Metal–matrix composite (MMC) coatings were deposited by Laser Cladding technique with direct injection of WC–FeNiCr powder onto N1310 nonmagnetic steel matrix. Laser Cladding was conducted using a Trumpf6000 CO 2 Laser. The morphology of WC–FeNiCr MMC coatings was characterized using scanning electron microscopy (SEM). Magnetic properties of WC–FeNiCr MMC coatings were examined by vibrating sample magnetometer (VSM) at room temperature. The influence of Laser Cladding Process on the magnetic properties of coatings was investigated. It was found that the content of tungsten carbide and Laser power have significant effect on the magnetic properties of composite coatings. The evolution of phase constitution at different Laser power was identified by X-ray diffraction (XRD). The presence of an austenitic γ-(Fe, Ni), Cr 0.19 Fe 0.7 Ni 0.11 , Fe 3 W 3 C, WC and W 2 C phases were confirmed by the XRD analysis in the Laser clad layer.
Jiaoxi Yang - One of the best experts on this subject based on the ideXlab platform.
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influence of Laser Cladding Process on the magnetic properties of wc fenicr metal matrix composite coatings
Journal of Materials Processing Technology, 2012Co-Authors: Jiaoxi Yang, Falan Liu, Xuanhe Miao, Feng YangAbstract:Abstract Metal–matrix composite (MMC) coatings were deposited by Laser Cladding technique with direct injection of WC–FeNiCr powder onto N1310 nonmagnetic steel matrix. Laser Cladding was conducted using a Trumpf6000 CO 2 Laser. The morphology of WC–FeNiCr MMC coatings was characterized using scanning electron microscopy (SEM). Magnetic properties of WC–FeNiCr MMC coatings were examined by vibrating sample magnetometer (VSM) at room temperature. The influence of Laser Cladding Process on the magnetic properties of coatings was investigated. It was found that the content of tungsten carbide and Laser power have significant effect on the magnetic properties of composite coatings. The evolution of phase constitution at different Laser power was identified by X-ray diffraction (XRD). The presence of an austenitic γ-(Fe, Ni), Cr 0.19 Fe 0.7 Ni 0.11 , Fe 3 W 3 C, WC and W 2 C phases were confirmed by the XRD analysis in the Laser clad layer.
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Influence of Laser Cladding Process on the magnetic properties of WC–FeNiCr metal–matrix composite coatings
Journal of Materials Processing Technology, 2012Co-Authors: Jiaoxi Yang, Falan Liu, Xuanhe Miao, Feng YangAbstract:Abstract Metal–matrix composite (MMC) coatings were deposited by Laser Cladding technique with direct injection of WC–FeNiCr powder onto N1310 nonmagnetic steel matrix. Laser Cladding was conducted using a Trumpf6000 CO 2 Laser. The morphology of WC–FeNiCr MMC coatings was characterized using scanning electron microscopy (SEM). Magnetic properties of WC–FeNiCr MMC coatings were examined by vibrating sample magnetometer (VSM) at room temperature. The influence of Laser Cladding Process on the magnetic properties of coatings was investigated. It was found that the content of tungsten carbide and Laser power have significant effect on the magnetic properties of composite coatings. The evolution of phase constitution at different Laser power was identified by X-ray diffraction (XRD). The presence of an austenitic γ-(Fe, Ni), Cr 0.19 Fe 0.7 Ni 0.11 , Fe 3 W 3 C, WC and W 2 C phases were confirmed by the XRD analysis in the Laser clad layer.
Ali Emamian - One of the best experts on this subject based on the ideXlab platform.
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Development of Metal Matrix Composite Coating Using Laser Cladding Process
2012Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:Laser Cladding by powder injection has received significant attention in recent years due to its unique features and capabilities in various industries involved in metallic coating, prototyping, and low-volume manufacturing. Further development of this technique depends on enhancement of understanding the variables that affect the quality (in terms of bonding and being crack free), morphology and microstructure of the clad. This book contains chapters on composite coating development using Laser Cladding Process. Developed coating shows superior mechanical and tribological properties along with minimum risk of crack formation by optimized Process parameters and control over melt pool composition. Moreover, this book gives a complete understanding of in-situ deposition of Fe-Ti-C system for researchers and engineers.
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Effect of C:Ti atomic ratio on TiC morphology deposited by Laser Cladding Process
International Congress on Applications of Lasers & Electro-Optics, 2011Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:In this paper, the effect of powder composition on TiC morphology and clad hardness using in-situ Laser Cladding Process has been studied. Two atomic ratios, 45% and 55%, were selected for C:Ti, the first one of which has the potential to form TiC without formation of the preliminary Ti (α) phase. Fe percentages were 70. Results show that chemical composition affects the TiC morphology, TiC distribution and hardness profile in the clad. By increasing the C:Ti ratio from 45 at% to 55 at%, it is shown that the volume fraction of the formed TiC increases. A higher volume fraction of TiC in the clad results in higher values of reinforcements in the clad, thus increasing the clad hardness. SEM and EDS analyses have been used to characterize the phases in the clad.In this paper, the effect of powder composition on TiC morphology and clad hardness using in-situ Laser Cladding Process has been studied. Two atomic ratios, 45% and 55%, were selected for C:Ti, the first one of which has the potential to form TiC without formation of the preliminary Ti (α) phase. Fe percentages were 70. Results show that chemical composition affects the TiC morphology, TiC distribution and hardness profile in the clad. By increasing the C:Ti ratio from 45 at% to 55 at%, it is shown that the volume fraction of the formed TiC increases. A higher volume fraction of TiC in the clad results in higher values of reinforcements in the clad, thus increasing the clad hardness. SEM and EDS analyses have been used to characterize the phases in the clad.
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effect of Laser Cladding Process parameters on clad quality and in situ formed microstructure of fe tic composite coatings
Surface & Coatings Technology, 2010Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:Abstract Over the past decade, researchers have demonstrated interest in tribology and prototyping by the Laser Cladding Process. In-situ Laser Cladding enables the formation of a uniform clad by melting the powder to form desired composition from pure powder component. In this research pure Ti, graphite, and Fe with max particle sizes of 40 μm (0.04 mm) are used for in-situ Laser Cladding on a steel substrate. The effects of Laser parameters on the quality of an in-situ formed TiC–Fe based composite clad are investigated. Laser parameters have an important role in clad quality and crack formation. They affect the bonding between clad/substrate and cooling rate. Diverse microstructures have been detected in the clad. Finally a model is developed in order to explain the formation and morphology of TiC. The melting and solidification stages of TiC formation and matrix confirm the suggested model. TiC particles increase the clad hardness to an average of four times greater than substrate's hardness. Experimental methods such as, XRD and SEM are used for phases characterization.
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effect of Laser Cladding Process parameters on clad quality and in situ formed microstructure of fe tic composite coatings
Surface & Coatings Technology, 2010Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:Abstract Over the past decade, researchers have demonstrated interest in tribology and prototyping by the Laser Cladding Process. In-situ Laser Cladding enables the formation of a uniform clad by melting the powder to form desired composition from pure powder component. In this research pure Ti, graphite, and Fe with max particle sizes of 40 μm (0.04 mm) are used for in-situ Laser Cladding on a steel substrate. The effects of Laser parameters on the quality of an in-situ formed TiC–Fe based composite clad are investigated. Laser parameters have an important role in clad quality and crack formation. They affect the bonding between clad/substrate and cooling rate. Diverse microstructures have been detected in the clad. Finally a model is developed in order to explain the formation and morphology of TiC. The melting and solidification stages of TiC formation and matrix confirm the suggested model. TiC particles increase the clad hardness to an average of four times greater than substrate's hardness. Experimental methods such as, XRD and SEM are used for phases characterization.
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Study on Laser parameters effect on morphology of in-situ Fe-TiC particles deposition on mild steel using Laser Cladding Process
International Congress on Applications of Lasers & Electro-Optics, 2010Co-Authors: Ali Emamian, Stephen F Corbin, Amir KhajepourAbstract:Over the last decade, researchers have demonstrated interest in tribology and prototyping by the Laser Cladding Process. In-situ Laser Cladding enables the formation of a uniform clad by melting the powder to form desired composition from pure powder components. Since TiC has desirable properties, such as hardness, wear and corrosion resistance, Ti and Graphite (C) are used as a composite material (i.e., TiC) to increase hardness and wear resistance of AISI 1030 carbon steel.In previous papers, the effect of Laser parameters on the clad quality was investigated. In this paper two combined parameters (i.e. the effective energy per unit area (Eeff) and the powder deposition density (PDD) were plotted in order to recognize the high quality clad zone. Afterward a range of clad conditions with constant and variable effective energies in high quality clad zone were conducted to study the role of the effective energy on morphology and distribution of TiC particles.Complete metallurgical bonding between substrate and the clad was observed in all samples.SEM analysis has been used to study the TiC particles’ morphology from the bottom to the top of the clad. Presence of in situ TiC particles in Fe (Ti) solid solution has been confirmed by XRD and EDS analysis.Over the last decade, researchers have demonstrated interest in tribology and prototyping by the Laser Cladding Process. In-situ Laser Cladding enables the formation of a uniform clad by melting the powder to form desired composition from pure powder components. Since TiC has desirable properties, such as hardness, wear and corrosion resistance, Ti and Graphite (C) are used as a composite material (i.e., TiC) to increase hardness and wear resistance of AISI 1030 carbon steel.In previous papers, the effect of Laser parameters on the clad quality was investigated. In this paper two combined parameters (i.e. the effective energy per unit area (Eeff) and the powder deposition density (PDD) were plotted in order to recognize the high quality clad zone. Afterward a range of clad conditions with constant and variable effective energies in high quality clad zone were conducted to study the role of the effective energy on morphology and distribution of TiC particles.Complete metallurgical bonding between substrate...
Chun H Wang - One of the best experts on this subject based on the ideXlab platform.
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quantitative fractography and modelling of fatigue crack propagation in high strength aermet 100 steel repaired with a Laser Cladding Process
International Journal of Fatigue, 2017Co-Authors: K F Walker, Jorge Magner Lourenco, Shi Da Sun, Milan Brandt, Chun H WangAbstract:Ultra-high strength steels employed in safety-critical applications, such as AerMet®100 used in aircraft landing gear structures, are managed on very conservative rejection criteria for small defects and repair options are limited. A novel repair technique using Laser Cladding has recently been developed. In the present paper we report a study of the fatigue endurance of AerMet®100 steel components repaired by the Laser Cladding Process, and a fracture mechanics based model to predict the fatigue endurance of repaired components. Three different types of samples were tested; baseline AerMet®100 sample with a small electro-discharge machining notch to initiate a crack, as-clad repaired, and as-clad repaired followed by heat treatment to relieve residual stresses. The specimens were subjected to cyclic loading under a special sequence consisting of constant amplitude segments at two different stress-ratios (ratio of minimum to maximum cyclic stress). The test results showed that the crack propagation lives from a common initial depth of 0.25 mm for the as-clad samples were significantly longer than the baseline samples by a factor of three to four. The longer life is attributed to the beneficial compressive residual stresses resulting from the repair Process. The model predictions are found to correlate well with the results of quantitative fractography measurements from samples tested under variable amplitude cyclic loads.
