The Experts below are selected from a list of 27942 Experts worldwide ranked by ideXlab platform
Yuichi Komizo - One of the best experts on this subject based on the ideXlab platform.
-
time resolved x ray diffraction studies of phase evolution including liquid phase and grain structure during Solidification Process in stainless steel welds
Materials Letters, 2012Co-Authors: Hidenori Terasaki, Yuichi KomizoAbstract:Abstract The Solidification Process in stainless steel welds was analyzed using a time-resolved X-ray diffraction technique. By using an undulator beam and a novel X-ray detector, not only the phase evolution during the Solidification Process but also the grain structure and liquid reduction during the Solidification Process were analyzed in the reciprocal lattice space. Furthermore, to estimate the temperature that stimulates stray grain formation, the temperature profile at the centerline of a weld bead was measured by using a radiation thermometer with immersion-type optical fiber.
Xiao-song Zhang - One of the best experts on this subject based on the ideXlab platform.
-
Effect of Supercooling on the Solidification Process of the Phase Change Material
Energy Procedia, 2017Co-Authors: Huoyan Hu, Xing Jin, Xiao-song ZhangAbstract:Some phase change materials (PCMs), such as salt hydrate, have the problem of supercooling. However, the effect of supercooling on the Solidification Process of PCM was usually ignored in the previous numerical researches, which would affect the accuracy of the results. To figure out the effect of supercooling on the Solidification Process of PCM, a mathematical heat transfer model of PCM was established in this paper and it was verified. The results showed that the supercooling degree of PCM is larger, the starting time of its Solidification Process would be later and the temperature of PCM would be lower; Before the phase transition, the maximum heat flux increases with the increase of supercooling degree. However, the maximum heat flux during the whole Solidification Process decreases with the increase of supercooling degree. Therefore, for some PCMs with high supercooling degree, the neglect of the effect of supercooling will bring significant errors to the results.
Hidenori Terasaki - One of the best experts on this subject based on the ideXlab platform.
-
time resolved x ray diffraction studies of phase evolution including liquid phase and grain structure during Solidification Process in stainless steel welds
Materials Letters, 2012Co-Authors: Hidenori Terasaki, Yuichi KomizoAbstract:Abstract The Solidification Process in stainless steel welds was analyzed using a time-resolved X-ray diffraction technique. By using an undulator beam and a novel X-ray detector, not only the phase evolution during the Solidification Process but also the grain structure and liquid reduction during the Solidification Process were analyzed in the reciprocal lattice space. Furthermore, to estimate the temperature that stimulates stray grain formation, the temperature profile at the centerline of a weld bead was measured by using a radiation thermometer with immersion-type optical fiber.
Ren Fuzhan - One of the best experts on this subject based on the ideXlab platform.
-
Progress in the micro-modeling of the casting Solidification Process
Journal of Materials Processing Technology, 2002Co-Authors: Hou Shuping, Zhao Weimin, Ren FuzhanAbstract:Abstract Progress in the micro-modeling of the casting Solidification Process is reviewed in this paper. A deterministic model and a probabilistic model for grain growth are described expressly and the characteristics of the present research and developing direction are analyzed.
Lijun Liu - One of the best experts on this subject based on the ideXlab platform.
-
improved seeded directional Solidification Process for producing high efficiency multi crystalline silicon ingots for solar cells
Solar Energy Materials and Solar Cells, 2014Co-Authors: Wenhan Zhao, Xueqin Liang, Jun Zhang, Lijun LiuAbstract:Abstract We proposed an improved Process design for the industrial mc-Si seeded directional Solidification Process to produce high-quality multi-crystalline silicon ingots for high-efficiency solar cells. A transient global model of heat transfer was employed to investigate the effects of the Process design parameters on the melt–crystal interface shape, thermal field, and thermal stress distribution in the solidified silicon ingot during the Solidification Process. Ingot casting experiments were carried out and the solar cell performance was measured. The results show that the melt–crystal interface shape in the improved Process design remains convex during almost the whole Solidification Process, and the thermal stress level at the bottom of the solidified ingots is significantly lower than in the original Process design. Based on the experimental results, the quality of grown silicon ingots and the conversion efficiency of solar cells were analyzed. The shadow region present in the silicon ingot produced with the original Process design disappears and the morphology of the ingot is improved with a more homogeneous distribution of grain orientation using the improved Process design. The average yield rate of the solidified silicon ingot is 8.18% higher with the improved Process design. The average conversion efficiency of solar cells is higher with the improved Process design (17.59%) than with the original Process design (17.48%).
-
study on thermal stress in a silicon ingot during a unidirectional Solidification Process
Journal of Crystal Growth, 2008Co-Authors: X J Chen, Lijun Liu, Satoshi Nakano, Koichi KakimotoAbstract:Abstract A transient global model was used to obtain the solution of a thermal field within the entire furnace during a unidirectional Solidification Process for photovoltaics. The melt–solid interface shape was obtained by a dynamic interface tracking method. The thermal stress distribution in the silicon ingot was solved using the displacement-based thermo-elastic stress model. Furthermore, several different melt–solid interface shapes were obtained by using different growth velocities, and then the thermal stresses for different Solidification times were compared. The simulation results suggested that the crucible constraint should be reduced and a longer Solidification time should be used for growing a silicon ingot with low thermal stress and low dislocation density.