(1. 西北工业大学 凝固技术国家重点实验室,西安 710072;
2. 南昌航空大学 航空制造工程学院,江西 330063)
摘 要: 研究了ZTC4钛合金凝固过程中在β相区、α+β相转变区的保温控制以及在700~950 ℃循环热处理对凝固组织的影响。结果表明:在β相区进行保温时,β晶粒粗大且形状不规则;在α+β相转变区进行保温控制时,α片层发生粗化、碎断,组织得到细化;而在700~950 ℃进行循环热处理时,α片层出现扭曲,组织细化得更加明显。
关键字: 钛合金;铸造;凝固路径;保温处理;循环热处理
(1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
2. School of Aeronautic Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China)
Abstract:The effects of heat preservation in β phase field, α+β phases field and cyclic heat treatment at 700-950 ℃ in the solidification of ZTC4 Ti alloy were investigated. The results show that β grain size inclines to be coarse and irregular in heat preservation in β phase field. In the case of heat preservation in α+β phase field, the α lamella tends to be coarse, shatter to pieces, hence, the microstructure is refined. The α lamellas twist and the refinement is more obvious in the cyclic heat treatment at 700-950 ℃.
Key words: titanium alloy; casting; solidification path; heat preservation; cyclical heat preservation