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通过研究Ti600合金电子束快速成形样坯的组织、室温强度和断口特征,探索用电子束快速成形(EBM)工艺制备Ti600合金复杂零件的可能性。结果表明:Ti600合金的EBM沉积态组织是网篮组织,从样坯顶部到底部,α片层组织逐渐变大,样坯中部有大量纳米级粒子析出;沿α边界有易腐蚀的“类球状组织”产生;Ti600合金EBM组织中的纳米级粒子主要是Y2O3、α2粒子、Si的高温相与低温相,Si的析出相与合金成分和EBM工艺有关;Ti600合金EBM样坯的顶部和底部室温抗拉强度高,中部室温抗拉强度低,主要与α片层尺寸和Si的存在形态有关;Ti600合金的EBM样坯的室温拉伸断口为塑性断裂,断裂主要是由缺陷、本征脆性、晶间结合不牢等原因引起。
The microstructure, room temperature strength and fracture characteristics of rapid prototyping of Ti600 alloy were studied to explore the possibility of preparing Ti600 alloy complex parts by electron beam rapid prototyping (EBM). The results show that the EBM morphology of Ti600 alloy is baskets. From the top to the bottom of the sample, the microstructure of α sheet becomes larger and larger, and a large number of nano-sized particles precipitate in the center of the sample. Spherical structure "; Ti600 alloy EBM organization of nano-particles are mainly Y2O3, α2 particles, Si high temperature phase and low temperature phase, Si precipitation phase and alloy composition and EBM process; Ti600 alloy EBM sample top and The tensile strength at room temperature at the bottom is high and the tensile strength at room temperature in the middle is low, which is mainly related to the size of α lamellae and the existence of Si. The room temperature tensile fracture of Ti600 alloy is plastic fracture and the fracture is mainly caused by defects, Brittle, intergranular bonding is not strong and other causes.