The Experts below are selected from a list of 4215 Experts worldwide ranked by ideXlab platform
Christian Coddet - One of the best experts on this subject based on the ideXlab platform.
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effects of Processing Parameters on properties of selective Laser melting mg 9 al powder mixture
Materials & Design, 2012Co-Authors: Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective Laser melting (SLM) was used to sinter a powder mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of Laser sintered powder mixture were established. The effect of Laser Processing Parameter on Mg–9%Al powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process Parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the Laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the Laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
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effects of Processing Parameters on properties of selective Laser melting mg 9 al powder mixture
Materials & Design, 2012Co-Authors: Baicheng Zhang, Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective Laser melting (SLM) was used to sinter a powder mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of Laser sintered powder mixture were established. The effect of Laser Processing Parameter on Mg–9%Al powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process Parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the Laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the Laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
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Processing of yttria partially stabilized zirconia thermal barrier coatings implementing a high power Laser diode
Journal of Thermal Spray Technology, 2004Co-Authors: G Antou, Christian Coddet, Ghislain Montavon, F Hlawka, A Cornet, Frederique MachiAbstract:Several studies have been undertaken recently to adapt yttria partially stabilized zirconia (YPSZ) thermal barrier coating (TBC) characteristics during their manufacturing process. Thermal spraying implementing Laser irradiation appears to be a possibility for modifying the coating morphology. This study aims to present the results of in situ (i.e., simultaneous treatment) and a posteriori (i.e., post-treatment) Laser treatments implementing a high-power Laser diode. In both cases, the coatings underwent atmospheric plasma spraying (APS). Laser irradiation was achieved using a 3 kW, average-power Laser diode exhibiting an 848 nm wavelength. Experiments were performed to reach two goals. First, Laser post-treatments aimed at building a map of the Laser-Processing Parameter effects on the coating microstructure to estimate the Laser-Processing Parameters, which seem to be suited to the change into in situ coating remelting. Second, in situ coating remelting aimed at quantifying the involved phenomena. In that case, the coating was treated layer by layer as it was manufactured. The input energy effect was studied by varying the scanning velocity (i.e., between 35 and 60 m/min), and consequently the irradiation time (i.e., between 1.8 and 3.1 ms, respectively). Experiments showed that coating thermal conductivity was lowered by more than 20% and that coating resistance to isothermal shocks was increased very significantly.
Han Lin Liao - One of the best experts on this subject based on the ideXlab platform.
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effects of Processing Parameters on properties of selective Laser melting mg 9 al powder mixture
Materials & Design, 2012Co-Authors: Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective Laser melting (SLM) was used to sinter a powder mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of Laser sintered powder mixture were established. The effect of Laser Processing Parameter on Mg–9%Al powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process Parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the Laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the Laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
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effects of Processing Parameters on properties of selective Laser melting mg 9 al powder mixture
Materials & Design, 2012Co-Authors: Baicheng Zhang, Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective Laser melting (SLM) was used to sinter a powder mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of Laser sintered powder mixture were established. The effect of Laser Processing Parameter on Mg–9%Al powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process Parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the Laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the Laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
Baicheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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effects of Processing Parameters on properties of selective Laser melting mg 9 al powder mixture
Materials & Design, 2012Co-Authors: Baicheng Zhang, Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective Laser melting (SLM) was used to sinter a powder mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of Laser sintered powder mixture were established. The effect of Laser Processing Parameter on Mg–9%Al powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process Parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the Laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the Laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
Roy A Choudhury - One of the best experts on this subject based on the ideXlab platform.
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evaluation of modulus of elasticity nano hardness and fracture toughness of tib2 tic al2o3 composite coating developed by shs and Laser cladding
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011Co-Authors: Manoj Masanta, S M Shariff, Roy A ChoudhuryAbstract:Abstract Modulus of elasticity (E) and nano-hardness (H) of the composite TiB2–TiC–Al2O3 coating deposited on AISI 1020 steel by combined self-propagating high-temperature synthesis (SHS) and Laser cladding process have been measured from load–displacement curves, resulting from nano-indentation testing. Fracture toughness (KIC) of the coatings has been evaluated from the indentation method. A qualitative evaluation of interfacial strength between coating and substrate material was also performed by indentation method. Results indicated elastic modulus and fracture toughness of the composite coatings are in the range of 230–280 GPa and 5.46–6.12 MPa m1/2 those are respectively lower and higher than those of the individual constituent ceramics. Nano-hardness of the coating microstructure obtained was in the range of 16–22 GPa and was found to vary depending on the Laser-Processing Parameter adopted. Indentation taken with high load at the coating–substrate interface indicated a strong interfacial bond between coating and steel substrate. An attempt has been made to co-relate the wear rate of the coating with H/E ratio.
Manoj Masanta - One of the best experts on this subject based on the ideXlab platform.
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evaluation of modulus of elasticity nano hardness and fracture toughness of tib2 tic al2o3 composite coating developed by shs and Laser cladding
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2011Co-Authors: Manoj Masanta, S M Shariff, Roy A ChoudhuryAbstract:Abstract Modulus of elasticity (E) and nano-hardness (H) of the composite TiB2–TiC–Al2O3 coating deposited on AISI 1020 steel by combined self-propagating high-temperature synthesis (SHS) and Laser cladding process have been measured from load–displacement curves, resulting from nano-indentation testing. Fracture toughness (KIC) of the coatings has been evaluated from the indentation method. A qualitative evaluation of interfacial strength between coating and substrate material was also performed by indentation method. Results indicated elastic modulus and fracture toughness of the composite coatings are in the range of 230–280 GPa and 5.46–6.12 MPa m1/2 those are respectively lower and higher than those of the individual constituent ceramics. Nano-hardness of the coating microstructure obtained was in the range of 16–22 GPa and was found to vary depending on the Laser-Processing Parameter adopted. Indentation taken with high load at the coating–substrate interface indicated a strong interfacial bond between coating and steel substrate. An attempt has been made to co-relate the wear rate of the coating with H/E ratio.
