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采用Gleeble-1500热模拟机对多组TC4钛合金试样进行了热压缩。建立了不同温度和应变速率下功率耗散系数η与应变的关系,绘制出了含应变的系列加工图,并分析了加工图中各区域的微观组织特征。结果表明,合金的应变速率敏感系数、η值和失稳区随应变不同而变化。真应变为0.916的加工图分为A、B、C三个区域。失稳A区η值出现极小值,应变速率较高时,材料局部发生动态再结晶,出现局部变形失稳的现象;应变速率较低时,组织不均匀,易失稳。稳定B区有较大的η值,其α相球化效果显著、组织均匀,加工性能得到改善,此区为最优加工区。稳定C区的α相球化效果比较明显,组织较均匀。
Several sets of TC4 titanium alloy specimens were hot-compressed using a Gleeble-1500 thermal simulator. The relationship between the power dissipation coefficient η and strain at different temperature and strain rate was established. A series of processing diagrams with strain were drawn, and the microstructural features of each region in the processing diagram were analyzed. The results show that the strain rate sensitivity coefficient, η value and instability of the alloy vary with different strain. True should become 0.916 processing map is divided into A, B, C three regions. When the strain rate is high, the material locally undergoes dynamic recrystallization and local deformation instability occurs. When the strain rate is low, the microstructure is not uniform and easily destabilized. Stable B area has a larger η value, the α-phase spheroidization effect is significant, uniform organization, processing performance is improved, this area is the best processing area. The α-phase spheroidization effect of the stable C region is obvious, the organization is more uniform.