The Experts below are selected from a list of 88671 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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designing expert system using neural computation in view of the control of plasma spray processes
Materials & Design, 2003Co-Authors: Sofiane Guessasma, Patrick Gougeon, Ghislain Montavon, Christian CoddetAbstract:Abstract This paper aims at integrating the artificial intelligence methodologies in a quality control of ceramic coating fabrication using the atmospheric plasma spray (APS) process. In such a way, the average velocity, temperature and diameter of thermally sprayed Al 2 O 3 -13 wt.% TiO 2 particles before impinging the work piece and forming a deposit are monitored. Then, as these particle characteristics represent the most pertinent indicators of the coating properties and characteristics reproducibility, they are chosen as the output of an expert system based on neural computation. The model is built also considering at the system input the plasma and particle powder injection-Processing Parameters. After an optimisation procedure, the predicted results are compared to the results of experimental data resulting from a non-intrusive sensor conventionally used by industrials to control the coating quality. The good agreement found between these results permits to establish the overall effect of each Processing Parameter on the in-flight particle characteristics.
Han Lin Liao - One of the best experts on this subject based on the ideXlab platform.
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laser additive manufacturing of single crystal superalloy component from solidification mechanism to grain structure control
2021Co-Authors: Chaoyue Chen, Han Lin Liao, Jiang Wang, Zhongming Ren, Shuo YinAbstract:Because of the high manufacturing cost of single-crystal (SX) superalloy blades, laser additive manufacturing (LAM) is considered as the most promising method to extend its service life. However, the difficulty in controlling the epitaxial growth of columnar dendrites from the SX substrate has hindered its further application. Recently, various researches have been conducted to understand the underlying mechanism for solidification and microstructure evolution. Thus, this chapter represents a comprehensive overview of the epitaxial growth characteristics of SX superalloy by LAM techniques, including the solidification mechanism, Processing Parameter optimization, cracking development, and posttreatment. Finally, the summary and perspectives are presented for the laser additive manufacturing of the SX superalloy component.
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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.
Qingdong Zhang - One of the best experts on this subject based on the ideXlab platform.
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hot deformation characteristics of az80 magnesium alloy work hardening effect and Processing Parameter sensitivities
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017Co-Authors: Yuanhua Cai, L Wan, Z H Guo, Chaoyang Sun, D J Yang, Qingdong ZhangAbstract:Abstract Isothermal compression experiment of AZ80 magnesium alloy was conducted by Gleeble thermo-mechanical simulator in order to quantitatively investigate the work hardening (WH), strain rate sensitivity (SRS) and temperature sensitivity (TS) during hot Processing of magnesium alloys. The WH, SRS and TS were described by Zener-Hollomon Parameter ( Z ) coupling of deformation Parameters. The relationships between WH rate and true strain as well as true stress were derived from Kocks-Mecking dislocation model and validated by our measurement data. The slope defined through the linear relationship of WH rate and true stress was only related to the annihilation coefficient Ω . Obvious WH behavior could be exhibited at a higher Z condition. Furthermore, we have identified the correlation between the microstructural evolution including β-Mg 17 Al 12 precipitation and the SRS and TS variations. Intensive dynamic recrystallization and homogeneous distribution of β-Mg 17 Al 12 precipitates resulted in greater SRS coefficient at higher temperature. The deformation heat effect and β-Mg 17 Al 12 precipitate content can be regarded as the major factors determining the TS behavior. At low Z condition, the SRS becomes stronger, in contrast to the variation of TS. The optimum hot Processing window was validated based on the established SRS and TS values distribution maps for AZ80 magnesium alloy.
Jiping Chen - One of the best experts on this subject based on the ideXlab platform.
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understanding Processing Parameter effects for carbon fibre reinforced thermoplastic composites manufactured by laser assisted automated fibre placement afp
Composites Part A-applied Science and Manufacturing, 2021Co-Authors: Jiping ChenAbstract:Abstract In this study, experimental investigations were performed to gain insights into the Processing Parameter effects of laser-assisted automated fibre placement (AFP) on the mechanical properties of carbon fibre (CF)/polyphenylene sulphide (PPS) composites from the perspective of void content and crystallinity. First, thermal characterisation was carried out to obtain the Processing window for the PPS/CF composites. The temperature histories at the nip point during an AFP process were measured using an in-house temperature measurement system and the desired ranges of laser power and placement rate were determined based on the measured temperatures. The placement rate was ranging from 6 to 60 m/min, and the range of the used laser power was 1–6 kW. Then, the effects of tool temperature ranging from 30 to 120 °C on the interlaminar shear strength and compression strength of the CF/PPS composites were examined. It was found that the interlaminar void content dominated the mechanical properties of the composite rather than the crystallinity. Finally, the composites produced by the AFP were further treated by an autoclave. It was shown that the interlaminar shear strength of the composites was significantly improved after the autoclave post-consolidation treatment due to the reduction in void content and the improvement of crystallinity. The interlaminar shear strength of the composites after the autoclave treatment was found to be independent of the placement rate, indicating elimination of the AFP thermal history due to sufficient heating and compaction time in the autoclave.
