冷却速度对Ti_3Al-10Nb-3V-1Mo合金组织的影响

Effect of Cooling rate on Microstructure of Alloy Ti-3Al-10Nb-3V-1Mo

用透射电镜研究了Ｔｉ３Ａｌ１０Ｎｂ３Ｖ１Ｍｏ合金在１１７０℃加热１ｈ，以不同速度冷却后的显微组织结构。结果表明，Ｗ．Ｑ．（水淬）组织由单一Ｂ２相组成，Ａ．Ｃ．（空冷）组织由Ｂ２相基体组成，Ｂ２相晶粒内开始了第二相的析出。Ｃ．Ｃ．（控冷）和Ｆ．Ｃ．（炉冷）组织主要是由α２片组成的魏氏组织。随冷却速度降低，合金强度明显降低，塑性略有提高。

The microstructure of alloy Ti-3Al-10Nb-3V-1Mo after heating at 1170℃ for 1 h and cooling to room temperature at different rates was investigated by TEM. The result showed that W.Q. microstructure consisted of single B2phase, A.C. microstructure consisted of B2phase matrix and second phase in some regions of the B2phase crystal grains, and C.C. and F.C. microstructure appeared as a Widmannstatten structure consisting of coarse α2phase plates and β-phase stripes between the plates. With cooling rate decreasing, the tension strength was obviously decreased and the plasticity was slightly increased at room temperature.