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利用Thermecmaster-Z型热模拟试验机在β相区对铸态TB6钛合金进行了热压缩试验,并对其动态再结晶行为进行了研究。结果表明,合金在β热变形过程中主要存在两类形核位置:原始β晶界附近及β晶粒内部,相应地存在两类动态再结晶机制:不连续动态再结晶和连续动态再结晶。在较高应变速率(≥0.01s-1)时,以不连续动态再结晶机制为主,但动态再结晶发生的程度较低,不能通过此机制使组织获得明显细化;在低应变速率(≤0.001s-1)和高变形温度(≥950℃)时,以连续动态再结晶机制为主。此时,合金动态再结晶晶粒直接由亚晶转变而成,组织均匀、细小。
The thermal compression test of as-cast TB6 titanium alloy in the β-phase region was carried out by Thermecmaster-Z thermal simulator, and its dynamic recrystallization behavior was studied. The results show that there are mainly two types of nucleation sites in the β thermal deformation: near the original β grain boundary and inside the β grain, there are two kinds of dynamic recrystallization mechanisms: discontinuous dynamic recrystallization and continuous dynamic recrystallization. At higher strain rates (≥0.01 s-1), discontinuous dynamic recrystallization was the dominant mechanism, but the dynamic recrystallization was less severe and could not be obviously refined by this mechanism. At low strain rate ( ≤0.001s-1) and high deformation temperature (≥950 ℃), the main mechanism of continuous dynamic recrystallization. At this point, the alloy dynamic recrystallization grains directly from the sub-crystal transition made of uniform, small.