固溶热处理对两相钛合金α片层球化行为的影响

Effect of Solution Treatment on Globularization Evolution of α Lamellae of High Strength and High Toughness Titanium Alloy

摘要:

本文以Ti-Al-Sn-Zr-Mo-Cr-V-Fe系合金为研究对象,设计不同的固溶热处理工艺,考察保温时间对合金α片层球化行为的影响,为优化合金的强韧性匹配建立基础。通过对金相组织进行观察以及对片层尺寸进行统计分析,得到了不同固溶时间下α片层尺寸的变化规律球化的演变。结果表明,固溶时间对初生α相球化关系为随着固溶时间的增加,球化率先增加至最高后基本趋于稳定,并利用界面分离、片层终止理论将该现象分析说明。本文的完成为该合金α/β两相区热处理工艺参数的设计及强度韧性匹配合理性提供一定的实验基础。

Abstract:

In this paper, the alloy of Ti-Al-Sn-Zr-Mo-Cr-V-Fe system was used as the research object. Design different solution heat treatments were to establish foundation of the optimization of the best match between the toughness and hardness of the alloy. The influence of solution time on the globularization of α layer were studied by observing metallographic organization and analysis of lamellae size. It was found that the relationship between the solution time and the α lamellae globularization was that as the increase of the solution time, and the globularization rate increased to the highest,controlled by boundary splitting and termination migration. That provides experimental basis for the design of thermal processing parameters and the matching of strength and toughness in α / β two-phase zone.