选区激光熔化(selective laser melting,SLM)增材制造铜锡合金具有优异综合力学性能,并广泛应用于高端制造行业。利用介观数值模拟对新材料CuSn10的SLM成形工艺进行开发优化,基于离散元法(discrete element method,DEM)构建CuSn10粉末...选区激光熔化(selective laser melting,SLM)增材制造铜锡合金具有优异综合力学性能,并广泛应用于高端制造行业。利用介观数值模拟对新材料CuSn10的SLM成形工艺进行开发优化,基于离散元法(discrete element method,DEM)构建CuSn10粉末随机分布的介观尺度模型,考虑粉末随温度变化的热物性参数;通过对CFD软件子程序二次开发,建立射线追踪热源模型,实现对熔池热传导、对流、辐射、蒸发等复杂物理过程的研究。结果表明,表面张力梯度引起的Marangoni对流以及蒸发形成的反冲压力对熔池形貌有很大影响。单道介观数值模拟结果与实验观测熔池、熔道形貌相吻合,线能量密度(line energy density,D_(LE))对SLM成形表面形貌至关重要,D_(LE)在307.7~400.0 J/m时,具有稳定的平直熔道,并在D_(LE)=345.5 J/m时,熔池传热传质稳定、熔道形貌良好,成功制备了高致密度样品。展开更多
Bilayer composite materials of Cu-coated Fe and CuSn10 containing 0%,5%,10%,15%,20%,25%,30%,35%,40%,45%,50%Cu-coated Fe were prepared in mesh belt sintering furnace.Microscopic pore morphology of materials was observe...Bilayer composite materials of Cu-coated Fe and CuSn10 containing 0%,5%,10%,15%,20%,25%,30%,35%,40%,45%,50%Cu-coated Fe were prepared in mesh belt sintering furnace.Microscopic pore morphology of materials was observed,bending strength was tested.Results show that,There is a good bonding between Cu-coated Fe and CuSn10,with the increase of Cu-coated Fe content from 0%to 50%,bending strength of bilayer composite materials increases.展开更多
文摘选区激光熔化(selective laser melting,SLM)增材制造铜锡合金具有优异综合力学性能,并广泛应用于高端制造行业。利用介观数值模拟对新材料CuSn10的SLM成形工艺进行开发优化,基于离散元法(discrete element method,DEM)构建CuSn10粉末随机分布的介观尺度模型,考虑粉末随温度变化的热物性参数;通过对CFD软件子程序二次开发,建立射线追踪热源模型,实现对熔池热传导、对流、辐射、蒸发等复杂物理过程的研究。结果表明,表面张力梯度引起的Marangoni对流以及蒸发形成的反冲压力对熔池形貌有很大影响。单道介观数值模拟结果与实验观测熔池、熔道形貌相吻合,线能量密度(line energy density,D_(LE))对SLM成形表面形貌至关重要,D_(LE)在307.7~400.0 J/m时,具有稳定的平直熔道,并在D_(LE)=345.5 J/m时,熔池传热传质稳定、熔道形貌良好,成功制备了高致密度样品。
基金Research project of Heyuan polytechnic(2022ky05,2022ky06)2019 Provincial Science and Technology Special Fund("Big project"+"Task List")project(2019005,2019004).
文摘Bilayer composite materials of Cu-coated Fe and CuSn10 containing 0%,5%,10%,15%,20%,25%,30%,35%,40%,45%,50%Cu-coated Fe were prepared in mesh belt sintering furnace.Microscopic pore morphology of materials was observed,bending strength was tested.Results show that,There is a good bonding between Cu-coated Fe and CuSn10,with the increase of Cu-coated Fe content from 0%to 50%,bending strength of bilayer composite materials increases.
