摘要
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 possibility of using electron beam melting（EBM） technology to manufacture Ti600 alloy complex parts was explored by studying EBM-Ti600 alloy microstructure,strength at room temperature and fracture characteristics.The results show that the deposition microstructure of EBM-Ti600 alloy is basket weave microstructure.The α laths gradually become larger from top to bottom of the part and vast nanometer secondary phase particles precipitate in the middle of the part.Susceptible corrosion structure is also observed along α boundaries.The nanometer secondary phase particles in the microstructure of EBM-Ti600 alloy mainly include particles of Y2O3,α2,high temperature phases and low temperature phase of Si,and the precipitated phase of Si is mainly related with the Ti600 alloy composition and the EBM process.The strength of EBM-Ti600 alloy at room temperature is not uniform,the top strength is the largest,then the bottom,and the middle is the lowest,which is because of the α lath size and the different existing forms of Si.The tensile fracture of EBM-Ti600 alloy at room temperature is plastic fracture,which is mainly caused by part defects,intrinsic brittleness and not strong intergranular bonding.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第11期2000-2004,共5页
Rare Metal Materials and Engineering
基金
陕西省自然科学基金重点项目(2011JZ007)
