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Additive manufacturing of high-entropy alloys by thermophysical calculations and in situ alloying

Journal of Materials Science & Technology 2021年第35期94卷 53-66页

作者： mehmet cagirici Pan Wang Fern Lan Ng Mui Ling Sharon Nai Jun Ding Jun Wei Singapore Institute of Manufacturing Technology 73 Nanyang Drive637662Singapore Department of Materials Science and Engineering National University of Singapore117576Singapore

Electron beam melting(EBM)is a promising technology to manufacture various alloys with outstanding properties;however,the number of available alloys is *** propose in situ alloying to accelerate the development of advanced and novel alloys,based on thermophysical calculations and CALPHAD approach,during the EBM *** demonstrate our concept through the design and fabrication of high entropy alloys(HEAs).Three CoCrFeNiMn-xTi(x=0.18,0.50,2.00,in molar%)HEAs are ***-built HEAs achieve a homogeneous distribution of elements while forming multiphase alloys resulted from the hot powder *** topological structures formed by secondary phases contribute to an increase in the hardness of EBM-built HEAs up to 900 *** alloy design,a systematic analysis on Co Cr Fe Ni Mn-0.18 Ti HEA elucidates the microstructural evolution in *** findings provide a deep understanding of in situ alloying and pave the way to develop new alloys specific to the EBM process.

关键词： 3D printing Cost reduction Electron beam melting High entropy alloy Mechanical properties Phase prediction

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Overview of finite elements simulation of temperature profile to estimate properties of materials 3D-printed by laser powder-bed fusion

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Chinese Physics B 2020年第4期29卷 98-109页

作者： Habimana Jean Willy Xinwei Li Yong Hao Tan Zhe Chen mehmet cagirici Ramadan Borayek Tun Seng Herng Chun Yee Aaron Ong Chaojiang Li Jun Ding Department of Materials Science and Engineering Faculty of EngineeringNational University of Singapore9 Engineering Drive 1Singapore 117576Singapore

Laser powder bed fusion(LPBF),like many other additive manufacturing techniques,offers flexibility in design expected to become a disruption to the manufacturing *** current cost of LPBF process does not favor a try-anderror way of research,which makes modelling and simulation a field of superior importance in that area of *** this work,various methods used to overcome challenges in modeling at different levels of approximation of LPBF process are *** efforts made towards a reliable and computationally effective model to simulate LPBF process using finite element(FE)codes are presented.A combination of ray-tracing technique,the solution of the radiation transfer equation and absorption measurements has been used to establish an analytical equation,which gives a more accurate approximation of laser energy deposition in powder-substrate *** this new analytical energy deposition model is used in in FE simulation,with other physics carefully set,it enables us to get reliable cooling curves and melt track morphology that agree well with experimental *** use of more computationally effective approximation,without explicit topological changes,allows to simulate wider geometries and longer scanning time leading to many applications in real engineering *** applications are herein presented including:prediction of printing quality through the simulated overlapping of consecutive melt tracks,simulation of LPBF of a mixture of materials and estimation of martensite inclusion in printed steel.

关键词： selective laser melting powder bed fusion finite element modeling laser absorption

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