Determination of phase transformation point of TA24 alloy by composition calculating method and differential scanning calorimetry
The β transformation temperatures of 11 pieces of TA24 near α titanium alloy samples in 4 specifications were measured by composition calculating method and differential scanning calorimetry.In the composition calculating method,the β transformation temperature of titanium alloy was determined according to the contribution rate of alloying elements and impurity elements to the phase transformation temperature.In the differential scanning calorimetry,the β transformation temperature was measured based on the heat change of titanium alloy during phase transition.The results showed that under the condition of 95％confidence,the deviation between methods was(-1.3+5.8)℃,and the absolute value of devia-tion was(2.4±3.9)℃.The measurement results of composition calculating method and differential scanning calorimetry method were consistent,and the deviation was between-6.9 ℃ and 2.4 ℃,which were both less than the allowable de-viation(±8 ℃)of two parallel tests in the laboratory specified by HB 6623.1-1992 and HB 6623.2-1992.The compo-sition calculating method could be used as a convenient and effective method to quickly predict the β transformation temper-ature of TA24 titanium alloy.
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维普
