一种新型高强度亚稳β钛合金Ti-B20

A New Type Metastable β Titanium Alloy Ti-B20 with High Strength

以‘临界钼当量条件下的多元强化’为原则设计了1种新型的高强度亚稳β钛合金Ti-B20,并研究了该合金热轧棒材(φ12mm^20mm)在不同热处理条件下的拉伸性能及显微组织。同现有的一些亚稳β钛合金相比,该合金时效处理时的响应快、析出相分布均匀、硬化效应高,并且高温时效时没有发现无析出区;合金在β相变点以下固溶加时效处理有利于保持合金的塑性,在500℃~600℃的温度范围内时效时可以获得优良的强度和塑性匹配(UTS:1200MPa^1500MPa;EL:8%~18%);而对热加工后的合金直接时效能产生更高的强化效果。

According to the principle of 'critical moly equivalence and multicomponent strengthening', a new type metastable beta titanium alloy with high strength was designed, and the tensile properties at room temperature and microstructure on hot rolled bar (φ 12 mm - 20 mm) of this alloy under different heat treatment conditions were studied. Compared with traditional metastable β titanium alloys, it's ageing response is fast, the distribution of dispersion phase is uniform, the hardening effect is high and no precipitate-free regions have been found during high temperature ageing treatment. Solution treatment below beta transus followed by ageing is suitable for keeping high plasticity. In this case, excellent strength/plasticity properties can be achieved (UTS: 1200 MPa - 1500 MPa; EL: 8% - 18%) by 500°C -600°C aging treatment. However, much higher strengthening effect can be obtained by direct ageing on hot rolled bar.