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对TC21钛合金进行超塑性拉伸和三重热处理试验,研究了三重热处理对TC21钛合金超塑性拉伸后组织的影响。结果表明,TC21钛合金在超塑性变形过程中发生明显的动态再结晶,α相含量随着变形温度的升高而减少,并发生α→β转变;TC21钛合金超塑性变形后经β相区固溶第一重热处理获得单相β组织,随后在(α+β)相区进行一次高温时效和一次低温时效,使细小针状α相在β基体中析出,得到网篮组织。针状α相含量随着变形温度和第二重温度的升高而增多,α晶粒长大并相互交织,网篮组织编织明显。
TC21 titanium alloy superplastic stretching and triple heat treatment experiments to study the triple heat treatment of TC21 titanium alloy after superplastic tensile organization. The results show that the dynamic recrystallization of TC21 titanium alloy occurs during the superplastic deformation. The content of α phase decreases with the increase of the deformation temperature and changes from α to β. After the superplastic deformation of TC21 titanium alloy, the β phase region The single-phase β microstructure was obtained by solid solution first reheat treatment, followed by a high-temperature aging and a low-temperature aging in the (α + β) phase. The small acicular α phase was precipitated in the β matrix to obtain the baskets. The content of acicular α phase increased with the increase of the deformation temperature and the second remelting temperature. The α grains grew up and interweaved with each other, and the weave of the basket was obvious.