差示扫描量热法测定钛合金的相变温度

采用差示扫描量热法测定了四种不同钛合金TC27、TA15、TC4、TB6的β相变温度。四种不同钛合金的测试曲线体现出类似的规律,TG线一直保持不变说明升温过程中没有发生氧化反应,在500℃前由于释放残余应力呈现放热现象,而在后向吸热方向偏移,这个过程发生了相变。通过对DSC曲线求一阶导数,其峰值即为β相变温度。通过对比四种不同钛合金差示扫描量热法和金相法的测试结果,两者相当接近,因此差示扫描量热法也是一种有效的测试钛合金β相变温度的方法。

The phase transition temperatures of four different titanium alloys TC27,TA15,TC4 and TB6 were measured by differential scanning calorimetry(DSC).The test curves of four different titanium alloys show a similar rule.The TG line remains constant all the time,which means that no oxidation reaction occurs during the heating process.Due to the exothermic phenomenon due to the release of residual stress before 500℃,it shifts backward to the endothermic direction.This process has undergone a phase transition.By calculating the first derivative of the DSC curve,the peak value is the phase transition temperature.By comparing the test results of differential scanning calorimetry and metallographic method of four different titanium alloys,the two methods are quite similar,so differential scanning calorimetry is also an effective method to measure the phase transformation temperature of titanium alloys.