Microstructural evolution during rolling of Ti22Al23Nb sheet
Microstructural evolution during rolling of Ti22Al23Nb sheet
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DOI：
10.1016/0921-5093(95)80043-3
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发表时间：
1995-11
期刊：
影响因子：
6.4
通讯作者：
S. Semiatin;P. R. Smith
中科院分区：
文献类型：
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作者：
S. Semiatin;P. R. Smith
研究了正交相钛铝合金Ti-22 Al-23 Nb在热装叠轧制过程中的组织演变。起始材料是具有细长有序β（B2）晶粒结构的现有热轧板，其晶界用正交（0）相装饰。使用两种不同类型的轧制程序，一种由在β（B2）转变以下单独轧制组成，另一种包括在转变以上预热（以便溶解第二相），然后在降低的温度条件下轧制通过转变。对于两种方案，轧制组织由细长的β（B2）晶粒和细小分散的第二相（O）颗粒组成。B2晶粒的再结晶的情况下，特别是对于涉及supertransus预热序列，解释了第二相的沉淀动力学的测量。这些测量表明非常快速的晶界沉淀，甚至接近于转变，这是导致β（B2）晶界钉扎的效应。
The evolution of microstructure during hot pack rolling of the orthorhombic titanium aluminide alloy Ti22Al23Nb was investigated. The starting material was a prior hot-rolled sheet with an elongated ordered β (B2) grain structure whose grain boundaries were decorated with orthorhombic (O) phase. Two different types of rolling schedule were utilized, one consisting of rolling below the β (B2) transus alone and the other comprising supertransus preheating (in order to dissolve the second phase) followed by rolling through the transus under decreasing temperature conditions. For both schedules, the rolled structure consisted of elongated β (B2) grains and a fine dispersion of second-phase (O) particles. The absence of recrystallization of the B2 grains, particularly for sequences involving supertransus preheating, was explained by measurement of the precipitation kinetics for the second phase. These measurements indicated very rapid grain boundary precipitation, even close to the transus, an effect that leads to the pinning of the β (B2) grain boundaries.