研究TC11钛合金片层组织在两相区980-850℃,0.001,0.01和0.1 s<'-1>应变速率条件下的热变形组织以及在不同温度退火过程中静态组织的演变规律和机制.结果表明,温度较高、应变速率较慢的条件下,动态球化过程进行得较充分,退火组织的球化分数主要取决于变形过程中的动态球化过程;温度较低、应变速率较快的条件下,动态球化过程不能充分进行,则退火后的球化分数取决于变形状态和退火过程中的静态球化过程.α晶粒尺寸则主要取决于退火温度和时间.进一步对比分析动静态球化组织的EBSD测试结果,表明退火静态球化的机制是β相的静态再结晶和α相的静态回复,以及随后的球化和聚集粗化过程.
The microstructure evolution of TC11 alloy with lamellar structures deformed at temperatures of 980-850 ℃ and strain rates of 0.001, 0.01 and 0.1 s<'-1>, and the static structure evolution and mechanism of the alloy annealed at different temperatures were investigated. The results show that dynamic recrystallization process at higher reduction, higher temperature and lower strain rate is almost complete, and the globularized fraction of the annealed microstructure mainly depends on the dynamic recrystallization during deformation. But the dynamic recrystallization process at lower reduction, lower temperature and higher strain rate is restrained, and the globularized fraction of the annealed structure depends on both of the deformation state and the static recrystallization process during annealing, α-grain size mainly depends on annealing temperature and holding time mainly. EBSD tests of dynamic and static globularized microstructures show that the mechanism of static globularization during annealing involves the static recrystallization of β-phase and the static recovery of α-phase, and subsequent globularization and coarsening.
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