凝固路徑對鑄態(tài)ZTC4鈦合金組織的影響Effect of solidification route on microstructure in cast ZTC4 Ti alloy

研究了ZTC4鈦合金凝固過程中在β相區(qū)、α+β相轉變區(qū)的保溫控制以及在700~950 ℃循環(huán)熱處理對凝固組織的影響。結果表明：在β相區(qū)進行保溫時，β晶粒粗大且形狀不規(guī)則；在α+β相轉變區(qū)進行保溫控制時，α片層發(fā)生粗化、碎斷，組織得到細化；而在700~950 ℃進行循環(huán)熱處理時，α片層出現(xiàn)扭曲，組織細化得更加明顯。

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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