凝固路径对铸态ZTC4钛合金组织的影响Effect of solidification route on microstructure in cast ZTC4 Ti alloy

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。

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 ℃.

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