TA24钛合金β转变温度的测定和分析

Determination and Analysis of β Transition Temperature of TA24 Titanium Alloy

采用成分计算法、连续升温金相法和差示扫描量热法测定了TA24钛合金的(α+β)/β相转变温度。通过金相法观察不同热处理温度试样显微组织中α相含量的变化,确定TA24合金的β转变温度为952℃,测量准确性较高。通过计算法根据合金元素及杂质元素的含量对相转变温度的累计值影响推算出转变温度为951.6℃,与金相法结果接近。通过差示扫描量热法测量相转变时的热量变化,测得转变温度约为954.6℃。结果表明:采用成分计算法、连续升温金相法和差示扫描量热法测定TA24钛合金相转变温度结果基本一致,实际测定中需基于多种方法进行综合判断。

The(α+β)/βphase transition temperature of TA24 titanium alloy was measured by calculation method,continuous heating metallographic method and differential thermal method.Theβtransition temperature of TA24 alloy was determined to be 952℃by observing microstructure change ofαphase content with different quenching temperatures.According to the influence of the content of alloy elements and impurity elements on the accumulative value of the phase transformation temperature,the calculated value of 951.6℃is close to that of metallographic method.Differential scanning calorimetry measures the heat change during the phase transition,and the transition temperature is about 954.6℃.The results show that the transformation temperature of TA24 titanium alloy is basically the same by these three methods,and the practical measurement should be based on the comprehensive judgement of these methods.