α→β phase transformation in BT25 titanium alloy affected by heating rate

被引：0
|
作者：
Cai G. [1 ,2 ]
Lei M. [1 ,2 ]
Wan M. [1 ,2 ]
Sun J. [1 ]
机构：
[1] College of Materials and Metallurgy, Guizhou University, Guiyang
[2] Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guizhou University, Guiyang
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2016年 / 40卷 / 01期
关键词：
Activation energy; BT25 titanium alloy; Heating rate; Phase transformation;
D O I：
10.13373/j.cnki.cjrm.2016.01.002
中图分类号：
学科分类号：
摘要：
Dilatometric curves of BT25 titanium alloy under different heating rates were measured by high differential dilatometry DIL805A/D, and β phase transition temperatures of alloy at corresponding heating rates were obtained. In order to validate the accuracy of these β phase transition temperatures, the relative content of phase and the evolution of microstructure which were acquired by cooling after tempering near the β phase transition temperature were analyzed by metallographic microscope and quantitative analysis software. Phase transformation at different temperature ranges during heating was analyzed on the basis of dilatometric curve. Finally, α phase transformation fraction as a function of temperature during different heating processes was obtained by lever rule. The results showed that the expansion method was able to measure accurately the β transformation temperature of BT25 titanium alloy at different heating rates. With the increase of heating rate, the starting and the finishing points of α→β phase transformation increased while the transformation range narrowed and the transformation rate increased. Meanwhile, the peak of transformation rate and the peak temperature were becoming higher with the increase of heating rate. The overall activation energy for the α→β phase transformation in BT25 alloy was evaluated on the basis of Kissinger equation, and the value was 953.15 kJ·mol-1. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：8 / 13
页数：5
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