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利用可控冷却速度热处理装置对Ti-6Al-2Zr-1Mo-1V合金进行了β热处理实验,并研究了该合金原始β晶粒尺寸和冷却速度对片层组织的影响。结果表明,原始β晶界是α片层的主要形核地点,原始β晶粒内可形成多个α集束团,同一α集束内α片层几乎成同一取向;随原始β晶粒尺寸降低,集束尺寸降低,而原始β晶粒尺寸对α片层厚度影响不大;随冷却速度增加,α片层厚度先快速降低,后缓慢降低,而集束尺寸则呈线性降低;α片层厚度与冷却速度呈反比关系:λ=3.94+9.24/v。
Β-heat treatment of Ti-6Al-2Zr-1Mo-1V alloy was carried out by controlled cooling rate heat treatment equipment, and the effect of initial β grain size and cooling rate on the microstructure was studied. The results show that the original β grain boundary is the main nucleation site of the α lamellae. Many α clusters can be formed in the original β grains, and the α lamellae in the same α lamella almost have the same orientation. With the decrease of the original β grain size, The size of the bundles decreases, while the original β grain size has little effect on the thickness of the α lamellae. With the increase of the cooling rate, the lamellar thickness of α lamellae decreases rapidly and then decreases slowly, while the size of the lamellae decreases linearly. The speed is inversely proportional: λ = 3.94 + 9.24 / v.