Ti-1300合金的非等温ω相变研究

Study on Non-thermal ω Phase Transformation of Ti-1300 Alloy

摘要:

通过膨胀法研究了Ti-1300合金在连续加热过程中ω相变。结果表明：Ti-1300合金在连续加热过程中低温区域发生了βM→ω+β相变，高温区域发生了βM→α+β相变，随着加热速率增大，βM→ω+β相变温度范围推向高温区域；ω相的体积转变分数与温度之间关系曲线呈典型的‘S’型；非等温ω相变的激活能随着转变体积分数增大而增加，相变阻力增大，平均相变激活能约55kJ/mol。

Abstract:

The ω phase transformation of Ti-1300 alloy during continuous heating was investigated using dilatometric method. Results show the βM→ω+β phase transformation happenes in low temperature zone, but the βM→α+β phase transformation happenes in high temperature zone during continuous heating. The temperature region of the β→ω phase transformation in the Ti-1300 alloy increased with increasing heating rate. The curves of ω phase transformed volume fraction and temperature at different heating rates exhibited a typical ‘S’ pattern. The activation energy of non-thermal ω phase transformation increased as increasing of ω phase transforming volume fraction, which added to precipitating resistance of ω phase. The average activation energy of the non-thermal ω phase transformation of the alloy was 55 kJ/mol.