论文部分内容阅读
TC21钛合金在超塑性拉伸后进行不同温度的三重热处理,研究三重热处理温度对超塑性拉伸后组织的影响。结果表明,超塑性拉伸组织后在940℃以上进行一重热处理后,大部分α相转化为β相和β转变组织,随着一重热处理温度的升高,β晶界逐渐完整,空冷后得到等轴β晶粒。二重热处理后在β晶粒内弥散析出许多细小针状次生α相,随二重热处理温度的升高,析出的次生α相含量增多,尺寸增大。三重热处理后针状α相间有更为细小二次生α相析出,随着三重热处理温度升高,网篮组织中二次α相变粗。
TC21 titanium alloy after superplastic stretching at different temperatures triple heat treatment to study triple heat treatment temperature on the superplastic stretch after the organization. The results show that most of the α phase is transformed into β phase and β transformation structure after superplastic stretching at 940 ℃. With the increase of the temperature of a heavy heat treatment, the β grain boundary gradually becomes intact, Axis β grains. After the second heat treatment, many fine acicular secondary α phases were precipitated in the β grains. With the increase of the second heat treatment temperature, the content of secondary α phase precipitated increased and the size increased. After the triple heat treatment, more fine secondary α phases precipitated between the acicular α phases. As the temperature of the triple heat treatment increased, the secondary α phase became thicker in the basket.