Ti-5553合金热变形时动态再结晶的临界条件

The Critical Conditions for Dynamic Recrystallizati0n of Ti-5553 alloy on hot deformation

摘要:

通过对Ti-5553合金在变形温度800～860℃、应变速率0.1～10s-1条件下进行热压缩试验，通过分析应力-应变曲线，推导出加工硬化率θ与临界应变ε的关系曲线，应用曲线的拐点判据得到了合金不同条件下变形发生动态再结晶的临界应变值。应用Sellarsn模型建立了合金发生动态再结晶的临界变形条件。

关键词:Ti-5553合金 热压缩变形 动态再结晶 临界应变

Abstract:

Hot compression tests of Ti-5553 titanium alloy were conducted at deformation temperature of 800-860℃and strain rates of 0.1～10s-1.The relationship curve of work hardening rate θ and critical strain ε was obtained according to true stress—true strain curves. The critica1 conditions of dynamic recrvstallization of Ti-5553 alloy were studied with the inflection point criterion of curves. The critical condition of dynamic recrystallization was obtained using mode of Sellarsn.

Key words:Ti-5553 alloy; hot compression deformation; dynamic recrystallization; critical strain