摘要
通过连续升温热膨胀法分析Ti55531(Ti-5Mo-5Cr-5V-3A1-1Zr)合金在连续升温过程中的热膨胀行为、物相组成和显微组织,绘制热膨胀微分曲线。结果发现:随着升温速率的增加,相变温度逐渐升高。其中,在1℃/min的升温速率下不同温度区间内的相变行为如下:低于192℃时,发生ωath→β转变;192~347℃时,发生β→ωiso转变;347~376℃时,发生ωiso→α+β、β→α转变;409~648℃时,发生β→α转变;648~831℃时,发生α→β转变;831℃时,转变为全β组织。计算得到α→β转变热激活能为188.04kJ/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 ℃, ωath transforms β; 192-347 ℃, β transforms ωiso; 347-376 ℃, ωiso 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2014年第7期1771-1777,共7页
The Chinese Journal of Nonferrous Metals
基金
湖南省科技重大专项(2010F51004)
中央高校基本科研业务费前沿研究计划(2009QZZD007)
湖南省研究生科研创新项目(CX2012B044)
关键词
Ti55531钛合金
热膨胀
相变序列
热激活能
Ti55531 Ti alloy
dilatometry
phase transformation sequence
activation energy