Ti62A钛合金固溶过程中初生α相的球化机理
Spheroidization mechanism of primary α-phase in solution treatment process of Ti62A titanium alloy
李海涛 1陈冬梅 1官海婷 2袁武华2
作者信息
- 1. 中国航空工业集团公司沈阳飞机设计研究所,辽宁沈阳 110035
- 2. 湖南大学材料科学与工程学院,湖南长沙 410082
- 折叠
摘要
采用OM、SEM和EBSD检测技术,对Ti62A钛合金在910 ℃固溶不同时间时的初生α相显微组织进行表征,探究固溶处理过程中初生α相的演变特征及球化机制.结果表明,锻态Ti62A钛合金初始组织由初生α相、片层α相和残留β相组成,在910 ℃固溶过程中,片层状α相快速溶解,且随着固溶时间延长,初生α相的体积分数先减小后保持不变,但轴径比基本保持在2.1左右.固溶处理过程中,初生α相晶粒内部出现较大的取向差,产生取向不同的α/α晶界.随着固溶时间的增长,长条状初生α相内oc/α晶界的取向差大于10°时,晶粒易发生晶界分离,形成新的等轴初生α相.
Abstract
Primary α phase microstructure of Ti62A titanium alloy solution treated at 910 ℃ for different time was characterized by means of OM,SEM and EBSD techniques,to investigate the evolution characteristics of the primary α phase and the spheroidization mechanism during the solid solution process.The results show that the initial microstructure of the forged Ti62A titanium alloy consists of the primary α phase,lamellar α phase and residual β phase.During the solid solution process at 910 ℃,the lamellar α phase dissolves rapidly,and the volume fraction of primary α phase first decreases and then remains unchanged with the increase of solution time,but the axis/diameter ratio is basically maintained at about 2.1.During the solution treatment,a large misorientation appeares inside the grains of the primary α phase,producing α/α grain boundaries with different orientations.With the growth of solution time,the grain is prone to grain boundary separation and the formation of new equiaxed primary α phase when the misorientation of α/α grain boundaries within the long strip primary α phase is greater than 10°.
关键词
Ti62A钛合金/固溶处理/显微组织/α相/球化机制Key words
Ti62A titanium alloy/solution treatment/microstructure/α phase/spheroidization mechanism引用本文复制引用
出版年
2024
NETL
NSTL
万方数据