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在热模拟试验机上对铸态Ti40合金在950～1100℃、应变速率0.001～1.0 s-1范围内进行了热压缩实验,并基于动态材料模型理论建立了该合金的加工图,通过分析加工图和观察变形组织,研究了该合金的高温变形特性。结果表明,该合金加工图上失稳区范围为950～1040℃、0.1～1.0 s-1,功率耗散效率η值最小,为0.16～0.35,易出现局部流动现象。加工图上有两个η峰值区,范围分别为1070～1100℃、0.1～1.0 s-1和1000～1100℃、0.001～0.02 s-1,η值分别达到局部最大和整个加工图最大,分别为0.42～0.68和0.44～0.76,对应的变形特性均为动态再结晶,二者是优化的加工区。加工图上除失稳区和η峰值区以外,其它区域的η值为0.36～0.44,介于失稳区和峰值区的η值之间,是热变形时可选的区域。
The hot compression test was performed on the as-cast Ti40 alloy at 950-1100 ℃ and the strain rate of 0.001-1.0 s-1 on a thermal simulator. The machining diagram of the alloy was established based on the dynamic material model theory. And observe the deformation of the alloy, the deformation characteristics of the alloy at high temperature. The results show that the instability range of the alloy is 950 ~ 1040 ℃ and 0.1 ~ 1.0 s-1, and the power dissipation efficiency η is the smallest, 0.16 ~ 0.35, which is easy to local flow. There are two peak areas of η in the processing diagram, which range from 1070 to 1100 ℃, 0.1 to 1.0 s-1 and 1000 to 1100 ℃, 0.001 to 0.02 s-1, respectively. The values of η reach the maximum and the maximum respectively, 0.42 ~ 0.68 and 0.44 ~ 0.76, the corresponding deformation characteristics are dynamic recrystallization, the two are optimized processing area. In addition to the destabilization zone and the η peak zone, the values of η in the other zones range from 0.36 to 0.44, which lies between the η values in the zone of instability and the peak zone, which is an optional area for thermal deformation.