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对TC4盘件进行高温双面辗压成形实验研究,观察了辗压后盘件的形状变化和微观组织分布。实验确认TC4盘件热辗压与铅盘室温辗压具有类似的形状变化特征,呈现出盘件直径增大、辗压槽两侧厚度增加、辗压槽出现“甩高”现象等。辗压后盘件微观组织分析结果表明,温度和变形对盘件微观组织变化有显著影响,因此盘件不同部位微观组织有明显差别:盘外缘温度偏高,变形量较小,组织处于相区;盘中心温度偏低,变形量较小,组织处于α+β相区;辗压槽及附近区域温度基本均匀为930℃,组织上处于β区,该区内材料变形差别较大,槽表面变形比槽中心大得多,组织上表现为初生α组织减少,并且槽表面比槽中心有更多的初生α组织转变为β相。
The TC4 plate was subjected to high-temperature double-side rolling forming experiment, and the shape change and microstructure distribution of the plate after rolling were observed. The experimental results show that the hot rolling of TC4 plate has similar shape change characteristics with the hot rolling of lead plate at room temperature, showing the increase of plate diameter, the increase of the thickness on both sides of the rolling groove and the appearance of “high rejection” in rolling groove. The results of microstructure analysis show that the temperature and deformation have a significant effect on the microstructural changes of the disk. Therefore, the microstructure of different parts of the disk has obvious difference: the temperature of the outer rim of the disk is too high, the deformation is small, the structure is in phase The temperature in the center of the plate is low and the amount of deformation is small, and the microstructure is in the α + β phase. The temperature in the rolling groove and the surrounding area is basically uniform at 930 ℃ and the structure is in the β region. The material deformation in this area is quite different. The surface deformities are much larger than the center of the trough, with a decrease in primary alpha tissue on the tissue and more primary alpha tissue to beta phase in the groove surface than in the center of the trough.