激光快速成形Ti-6Al-4V合金力学性能

Mechanical Properties of Ti-6Al-4V Alloy by Laser Rapid Forming

摘要:

采用实验研究的方法，对激光快速成形Ti-6Al-4V合金的力学性能进行了探讨。结果发现：和锻造件相比，激光快速成形沉积态Ti-6Al-4V合金的拉伸性能具有高强低塑特点和更显著的各向异性；成形试样的组织、氧含量和冶金缺陷都将影响到拉伸性能，其中组织的影响最显著，其次为氧含量和熔合不良缺陷：对于氧含量符合GJBGJB2921-1997标准的激光快速成形Ti-6Al-4V合金，经固溶时效热处理后所获得的网篮组织综合性能最好，不论是强度指标还是塑性指标都高于锻件标准。

Abstract:

The mechanical properties of Ti-6Al-4V alloy by laser rapid forming (LRF) have been investigated. The results show that the mechanical properties of the as-deposited Ti-6Al-4V alloy have the characteristics of higher strength, lower ductility and more distinct anisotropy properties as compared to wrought. The microstructure, content of oxygen and metallurgical flaw of the laser formed samples will have effect on the tensile test results. It is the microstructures that play crucial roles on the mechanical properties, while the oxygen content and ill-bonding flaw are in the next place. For the LRF Ti-6Al-4V alloy with the oxygen content meeting GJB GJB2921-1997, a basket weave microstructure obtained through the solution-aging treatment brings forth the best mechanical properties. Not only the strength but also the ductility is over than that of the wrought specification.