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力學系學術報告 基于加工微觀結構性能的有限元相場模擬在金屬粉床熔化3D金屬打印中的應用
報??告??人:胥柏香(教授,德國達姆施塔特工業大學)
時????????間:2019年5月31日上午8:30
地????????點:理學院(東區逸夫樓)302
主辦單位:理學院應用力學系
聯系人:高陽
聯系方式:010-62736411

There exists large potential for the mechanical and functional property of the additively manufactured part to be optimized with respect to the process and material parameters. Compared with the expensive trial-and-error principle, physical models and numerical simulations are much more efficient in terms of both cost and time. They allow massive parameter studies which can provide large database for statistical analysis such as machine learning to extract the process-microstructure-property relation. One needs hence a reliable physical model, which can recapture the processing and the microstructure development. In this work we present a thermodynamically consistent phase-field model and the finite element simulations of microstructure evolution (pore and grain structure) during powder bed fusion additive manufacturing of metallic materials. Preliminary work has been done on the particle level and the mesoscopic level. Furthermore, we study both the selective laser sintering (SLS) and selective laser melting (SLM). The model includes simultaneously complex underlying physics, such as extreme heat diffusion, melting, solidification and grain coalescence. The models are parameterized using measured thermodynamic and kinetic data. For the process simulation, we overcome the numerical challenges on powder bed deposition, power injection and strategies to reduce the computation cost by a novel algorithm analogy to minimum coloring problem and grain tracking approach. Simulation results will be shown for e.g. stainless steel 316L and Fe-alloys. We reveal the influences of process parameters e.g. the laser power and scan speed on the microstructure features, such as porosity, surface morphology, densification and residual stress.

胥柏香教授于2002年獲得南京河海大學學士學位,2008年獲得北京大學博士學位,同年獲得德國洪堡獎學金。2016年成為德國達姆斯塔特工學大學終身教授。近期研究課題著重于功能及能源材料的多場耦合問題的理論建模及數值模擬,成型/微結構/性能之間的關聯性的研究,主要涉及納米及微米尺度。近五年主持或參與科研項目12項(歐洲項目1項、德國聯邦政府項目9項,德國黑森州項目2項)。近五年在Nature Communications, Materials Horizons, Nano Energy,Acta Materialia,Int. J. Plasticity, IJSS等重要國際期刊上發表SCI檢索論文60余篇。


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