Ti55531合金連續(xù)升溫過程的相變行為Phase transformation of Ti55531 alloy during continuous heating process

通過連續(xù)升溫熱膨脹法分析Ti55531(Ti-5Mo-5Cr-5V-3Al-1Zr)合金在連續(xù)升溫過程中的熱膨脹行為、物相組成和顯微組織，繪制熱膨脹微分曲線。結果發(fā)現(xiàn)：隨著升溫速率的增加，相變溫度逐漸升高。其中，在1 ℃/min的升溫速率下不同溫度區(qū)間內的相變行為如下：低于192 ℃時，發(fā)生ω_ath→β轉變；192~347 ℃時，發(fā)生β→ω_iso轉變；347~376 ℃時，發(fā)生ω_iso→α+β、β→α轉變；409~648 ℃時，發(fā)生β→α轉變；648~831 ℃時，發(fā)生α→β轉變；831 ℃時，轉變?yōu)槿陆M織。計算得到α→β轉變熱激活能為188.04 kJ/mol。

The dilatometry behavior, phase composition and microstructure of Ti55531(Ti-5Mo-5Cr-5V-3Al-1Zr) alloy were investigated during continuous heating process, and the derivative of dilatometric curve was thereby calculated. The results show that the phase transformation temperature increases with accelerating heating rate. Consequently, phase transformation sequence of Ti55531 alloy at heating rate of 1℃/min is confirmed as follows: temperature below 192 ℃, ω_ath transforms β; 192-347 ℃, β transforms ω_iso; 347-376 ℃, ω_iso transforms α+β and β transforms α; 409-648 ℃, β transforms α; 648-831 ℃, α transforms β; over 831 ℃, full β. The activation energy value relating to α→β transformation in Ti55531 alloy is evaluated as 188.04 kJ/mol.

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