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试验研究了不同温度以及不同挤压次数下Ti-1023合金经等通道转角挤压后组织演变规律。结果表明:挤压温度对微观组织有显著影响。在相变点以下挤压时,可以得到细小均匀的组织,且组织中含有大量的等轴α相;在相变温度以上挤压时,细小等轴β晶粒迅速长大,多次挤压并不能有效地细化β晶粒。此外,挤压次数对合金的组织演变也有较大影响,为了获得比较均匀细小的组织,挤压次数不宜过多。采用750℃挤压温度+标准热处理+4次挤压的工艺可以得到细小均匀的组织。
The microstructure evolution of Ti-1023 alloy extruded through isochronal channels at different temperatures and different extrusion times was studied. The results show that the extrusion temperature has a significant effect on the microstructure. When the pressure is lower than the transformation point, fine and even microstructure can be obtained, and the microstructure contains a large amount of equiaxed α phase. At the time of extrusion above the transformation temperature, the fine equiaxed β grains rapidly grow up and squeeze several times Β grains can not be effectively refined. In addition, the number of extrusion on the evolution of the alloy has a greater impact, in order to obtain more uniform and small organizations, the number of extrusion should not be too much. The use of 750 ℃ extrusion temperature + standard heat treatment +4 times the extrusion process can be fine uniform organization.