The three-dimensional （3D） processing maps considering strain based on the two-dimensional （2D） processing maps proposed by PRASAD can describe the distribution of the efficiency of power dissipation and flow inst...The three-dimensional （3D） processing maps considering strain based on the two-dimensional （2D） processing maps proposed by PRASAD can describe the distribution of the efficiency of power dissipation and flow instability regions at various temperatures, strain rates and strains, which exhibit intrinsic workability related to material itself. Finite element （FE） simulation can obtain the distribution of strain, strain rate, temperature and die filling status, which indicates state-of-stress （SOS） workability decided by die shape and different processing conditions. On the basis of this, a new material driven analysis method for hot deformation was put forward by the combination of FE simulation with 3D processing maps, which can demonstrate material workability of the entire hot deformation process including SOS workability and intrinsic workability. The hot forging process for hard-to-work metal magnesium alloy was studied, and the 3D thermomechanical FE simulation including 3D processing maps of complex hot forging spur bevel gear was first conducted. The hot forging experiments were carried out. The results show that the new method is reasonable and suitable to determine the aoorooriate nrocess narameters.展开更多
粘结剂喷射3D打印(binder jet 3D printing,BJ3DP)是一种无熔化、高效率、低成本的金属增材制造技术,近年来在复杂结构、大尺寸、高精度构件制造中展现出了巨大的应用潜力。相比激光熔化等工艺,BJ3DP具有材料适应性强、工艺温度低、无...粘结剂喷射3D打印(binder jet 3D printing,BJ3DP)是一种无熔化、高效率、低成本的金属增材制造技术,近年来在复杂结构、大尺寸、高精度构件制造中展现出了巨大的应用潜力。相比激光熔化等工艺,BJ3DP具有材料适应性强、工艺温度低、无残余应力等优势,适用于热敏性或易氧化金属材料。总结了金属BJ3DP打印构件的影响因素,包括粉末特性、打印参数、脱脂/烧结工艺等,重点介绍了铁基、镍基、镁基、铝基、高熵合金等合金在BJ3DP成形过程中的物相、微观组织与性能。最后,简要概述了目前存在的问题及未来的发展趋势。展开更多
基金Project(2011ZX04014-051)supported by the Key Scientific and Technical Project of ChinaProjects(51375306,50905110)supported by the National Natural Science Foundation of China
文摘The three-dimensional （3D） processing maps considering strain based on the two-dimensional （2D） processing maps proposed by PRASAD can describe the distribution of the efficiency of power dissipation and flow instability regions at various temperatures, strain rates and strains, which exhibit intrinsic workability related to material itself. Finite element （FE） simulation can obtain the distribution of strain, strain rate, temperature and die filling status, which indicates state-of-stress （SOS） workability decided by die shape and different processing conditions. On the basis of this, a new material driven analysis method for hot deformation was put forward by the combination of FE simulation with 3D processing maps, which can demonstrate material workability of the entire hot deformation process including SOS workability and intrinsic workability. The hot forging process for hard-to-work metal magnesium alloy was studied, and the 3D thermomechanical FE simulation including 3D processing maps of complex hot forging spur bevel gear was first conducted. The hot forging experiments were carried out. The results show that the new method is reasonable and suitable to determine the aoorooriate nrocess narameters.
文摘粘结剂喷射3D打印(binder jet 3D printing,BJ3DP)是一种无熔化、高效率、低成本的金属增材制造技术,近年来在复杂结构、大尺寸、高精度构件制造中展现出了巨大的应用潜力。相比激光熔化等工艺,BJ3DP具有材料适应性强、工艺温度低、无残余应力等优势,适用于热敏性或易氧化金属材料。总结了金属BJ3DP打印构件的影响因素,包括粉末特性、打印参数、脱脂/烧结工艺等,重点介绍了铁基、镍基、镁基、铝基、高熵合金等合金在BJ3DP成形过程中的物相、微观组织与性能。最后,简要概述了目前存在的问题及未来的发展趋势。
