TA2纯钛热压缩过程中形变对相变与再结晶的影响
Effect of Deformation on Phase Transition and Recrystallization During Thermal Compression of TA2 Pure Titanium
刘程祥 1黄东亚 1周荣锋 1刘昆 2李永坤 1殷新华 1文科 1张亚真1
作者信息
- 1. 昆明理工大学材料科学与工程学院,云南 昆明 650093
- 2. 云南钛业股份有限公司,云南楚雄 651209
- 折叠
摘要
使用Gleeble-1500热力学模拟实验机对TA2纯钛在相变点前后以10s-1的变形速率进行热压缩变形,研究热压缩对相变的影响.研究发现形变作用在相变点附近时,相变首先发生在板条之间,新形成的β晶粒多为球状或短棒状.随着压缩量的增大,相邻的β晶核逐渐连接并变为条状组织.相变存在临界值,当压缩温度分别为860、890和920 ℃时,压缩量达到40％、30％和20％时,相变趋于饱和,取而代之的是动态再结晶的大量发生.温升效应对相变的影响不大,当变形量较大时温升效应相应提高,动态再结晶数目显著增多,而相变却几乎不发生.温度越高,形变促进相变的现象就越明显,当压缩温度在相变点之后时,很小的压缩量就可以使相变快速发生.
Abstract
Gleeble-1500 thermodynamic simulation test machine was used to perform thermal compression deformation on TA2 pure titanium at a deformation rate of 10 s-1 before and after the phase change point,and the influence of thermal compression on the phase transition was studied.It is found that when the deformation is near the phase transition point,the phase transition first occurs between the slats,and the newly formed β grains are mostly spherical or short rod-like.As the amount of compression increases,adjacent β nuclei gradually connect and become strip-like structure.There is a critical value for phase transition.When the compression temperature is 860,890 and 920 ℃ and the compression amount reaches 40％,30％and 20％,respectively,the phase transition tends to saturate,and a large number of dynamic recrystallization occurs.The temperature rise effect has little effect on the phase transition,and when the deformation is large,the temperature rise effect increases correspondingly,and the number of dynamic recrystallization increases significantly,but the phase transition hardly occurs.The higher the temperature,the more obvious the phenomenon of deformation promoting phase change.When the compression temperature is after the phase change point,a small amount of compression can make a large number of phase transitions occur.
关键词
纯钛/热压缩/EBSD/微观结构Key words
pure titanium/heat compression/EBSD/microstructure引用本文复制引用
出版年
2024
NETL
NSTL
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